Barrus Shire 30 WB User manual

RDG603A17 – Issue 1 – Shire 30_40_50 WB/RB Manual
SH IRE WORK BOAT AND RIVER BOAT ENGINE MANUAL
For the following engine models:
SHIRE 30 WB
SHIRE 30 RB
SHIRE 40 WB
SHIRE 40 RB
SHIRE 50 WB
SHIRE 50 RB
Please read in conjunction with
Yanmar & the PRM Gearbox Manual
Optional:
Travel Power Manual, Hybrid Manual
Enter your engine identification details in the spaces provided above.
E. P. BARRUS LIMITED, Launton Road, Bicester, Oxfordshire. OX26 4UR
Tel: [phone] Fax: [phone] www.barrus.co.uk

RDG603A17 – Issue 1 – Shire 30_40_50 WB/RB Manual
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Declaration of Conformity for Recreational Craft Propulsion Engine with the
requirements of Directive 2013/53/EU.
Name of Engine Manufacturer: Yanmar Co., LTD.
Name of Authorised Representative: E.P.Barrus LTD
Address: E.P.Barrus LTD, Launton Road, Bicester, Oxon, OX26 4UR, England
Engine type approved according to: Stage IIIB
of Directive 97/68/EC, 88/77/EC
Name of Notified Body for exhaust emission assessment: United States Environmental Protection Agency
Address: Office of Transportation and Air Quality
Town: Michigan Post Code: 48105 Country: USA ID Number: BCHCL1.12AAA-002
Conformity assessment module used for exhaust emissions: B+C B+D B+E B+F G H
Or engine type-approved according to: Rstage II of Directive 97/68/EC RDirective 88/77/EC
Other Community Directives applied:
Description of Engine(s) and Essential Requirements
Engine Type: Inboard Engine Fuel Type: Diesel Combustion Cycle: 4 Stroke
Identification of Engine(s) covered by this Declaration of Conformity
Engine Model
Engine Type
Engine Family
code
Type Approval Certificate Number
Shire 30
3TNV 82A BDSA
YD1300DNMDEC
e13*97/68DA*2006/105KA*0558*11
Shire 40 / 50
4TNV 88 BDYE
G2YDXCL0164N3N
e13*97/68DA*2012/46KA*0574*24
Essential Requirements
Standards
Other normative
document/method.
Technical
file
Specify in more detail
*= Mandatory standard.
Annex 1.B- Exhaust Emissions
B.1 Engine Identification
B.2 Exhaust emission
requirements
*
R
*EN ISO 8178
B.3 Durability
B.4 Owners Manual
R
ISO10240
Annex 1. C- Noise Emissions
See Declaration of Conformity of the craft in which the engine(s) has(have) been installed
This declaration of conformity is issued under the sole responsibility of the manufacturer. I declare on behalf
of the engine manufacturer that the engine(s) [is (are) in conformity with the type(s) for which above
mentioned EC type-examination or type approval certificate(s) has (have) been issued and]1will meet the
exhaust emission requirements of Directive 94/25/EC as amended by Directive 2003/44/EC when installed in
a recreational craft, in accordance with the engine manufacturer’s supplied instructions and that this (these)
engine(s) must not be put into service until the recreational craft which it is (they are) to be installed has been
declared in conformity with the relevant provisions of the above mentioned Directives.
Tim Hart
Sales Director
Signed: Bicester, UK
Date: 16/01/2016

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PLEASE NOTE:
This manual has been compiled to help you to operate your engine and its associated parts
with safety and pleasure. Please read it carefully and familiarise yourself with the engine
and its parts before operation.
E.P.Barrus reserve the right to change the specification of its products and manuals without
prior notice.
Depending upon the equipment specification of the engine and accessories fitted, there
may be discrepancies with the information presented in this handbook. No claims may be
pursued in this respect.
WARNING:
THIS MANUAL FORMS AN INTEGRAL PART OF THE ENGINE IT ACCOMPANIES, IF
A TRANSFER OF TITLE OCCURS, IT MUST ALWAYS BE HANDED OVER TO THE
NEW OWNER.
WARRANTY
This Limited Warranty provides coverage for five (5) years (or 2000 hours whichever occurs
first) for recreational users and three (3) years (or 2000 hours whichever occurs first) for
commercial users from the date of warranty registration. The repair or replacement of parts,
or the performance of service under this warranty, does not extend the life of this warranty
beyond its original expiry date.
To ensure that you have been registered for your warranty, please ask your Boat Builder or
Engine Supplier to provide your portion of the registration form.
The Warranty will only apply if the following have been carried out:
1/ The Installation Check List in the Installation Section has been fully completed.
2/ The boat builder or engine installer has completed the Boat Builder Section on the
Service Record Card (located at the back of this manual) regarding hand over and
commissioning of boat.
3/ The registration form has been completed and returned to E.P Barrus.

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PRM Gearboxes are covered by a three (3) year warranty for recreation users and two (2)
years for commercial users.
Engine alternator, starter motor and electrical components are only covered by a one (1)
year warranty.
CONDITIONS THAT MUST BE MET IN ORDER TO OBTAIN WARRANTY COVERAGE:
Warranty coverage is only available from an authorised dealer in the country in which the
sale occurred. Routing maintenance outlined in the Owner’s Manual must be performed
using genuine parts in order to maintain warranty coverage. If the customer performs
maintenance, Barrus reserves the right to make future warranty coverage possible only with
proof of proper maintenance.
WARRANTY CLAIMS
Warranty claims shall be made by an authorised dealer or boat builder.
The dealer or boat builder will then arrange for the inspection and any necessary repairs. If
the repairs carried out are not covered by the warranty, the purchaser shall pay for all
related labour and material, and any other expenses associated with that service.
WHAT IS NOT COVERED
This limited warranty does not cover routine maintenance items, adjustments, normal wear
and tear, damage caused by abnormal use, operation of the product in a manner
inconsistent with the recommended operation/duty cycle section of the Owner’s Manual,
accident, submersion, improper installation (proper installation specification and techniques
are set forth in the Operations and First time running sections in this manual), use of an
accessory or part not manufactured or sold by us, or alteration or removal of parts.
Expenses related to crane-out, launch, towing, storage, telephone, rental, inconvenience,
slip fees, insurance coverage, loan payments, loss of time, loss of income, or any other
types of accidental or consequential damages are not covered by this warranty.
Engine electrical systems fitted with alternator boost charge systems or any other electrical
management systems are not covered by warranty.
Engine and fuel equipment is not covered by warranty if bio-diesel is used in the fuel
system. Also if no type of water trap is incorporated into fuel system.

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Index
Page
SECTION 1 – Safety Precautions ...................................................................8!
1.!General.........................................................................................................................8!
2.!Lifting............................................................................................................................8!
3.!Rotating Shafts and Belts.............................................................................................8!
4.!Exhaust System ...........................................................................................................8!
5.!Launching and Lifting Boats .........................................................................................8!
6.!Batteries .......................................................................................................................8!
SECTION 2 – Engine Identification ..............................................................10!
SECTION 3 – Installation...............................................................................11!
1.!Ventilation...................................................................................................................11!
2.!Engine Beds ...............................................................................................................11!
3.!Pressurised Water Header Tank ................................................................................11!
4.!Shaft Connection and Propeller Selection..................................................................11!
5.!Engine Anti-Vibration Mounts.....................................................................................11!
6.!Engine Alignment .......................................................................................................13!
7.!Electrics......................................................................................................................14!
8.!Electrical Options .......................................................................................................15!
9.!Engine Oil...................................................................................................................15!
10.!Fuel ............................................................................................................................15!
11.!Coolant .......................................................................................................................16!
12.!Control Cables............................................................................................................16!
13.!Domestic Battery Bank...............................................................................................17!
14.!Seawater Strainer.......................................................................................................17!
15.!Control Panel..............................................................................................................17!
16.!Seawater Pump Hose Minimum Inlet Size .................................................................18!
17.!Exhaust System .........................................................................................................18!
18.!Hydraulic Drive Transmissions...................................................................................22!
19.!Hydraulic Pump Drive Option (Shire 30, 40, 50) ........................................................22!

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20.!Calorifiers ...................................................................................................................22!
21.!Control Cables............................................................................................................22!
22.!Installation Check List ................................................................................................23!
SECTION 4 – Operation.................................................................................24!
1.!Starting the engine for the first time ...........................................................................24!
2.!Starting Procedure .....................................................................................................25!
3.!Stopping Procedure....................................................................................................25!
4.!Full Load Running ......................................................................................................25!
5.!Refuelling ...................................................................................................................26!
6.!Diesel Fuel Additive....................................................................................................26!
7.!Exhaust Hose Sizes (River Boat) ...............................................................................26!
8.!Exhaust Back Pressure (Work Boat with dry exhaust)...............................................26!
9.!Single Lever Side Mount Operation - Optional (RDG9210055) .................................26!
SECTION 5 – Service Procedure ..................................................................27!
1.!Engine Oil and Filer Change ......................................................................................28!
2.!Air Filter Check and Change (Shire 30, 40, 50 WB and Shire 40, 50 RB) .................28!
3.!Air Filter Check and Change (Shire 30 RB) ...............................................................28!
4.!Gearbox Oil Change...................................................................................................29!
5.!Disposal of Oil and Related Items ..............................................................................30!
6.!Primary Fuel Filter Drain – Shire 30, 40 & 50.............................................................30!
7.!Primary and Secondary Fuel Filter Change ...............................................................31!
8.!Fuel System Bleeding ................................................................................................31!
9.!Cooling System ..........................................................................................................31!
10.!Belt Adjustment ..........................................................................................................32!
11.!Belt Maintenance........................................................................................................32!
12.!Belt Replacement .......................................................................................................33!
13.!Control Panel Maintenance ........................................................................................33!
14.!Sacrificial Anode Change ...........................................................................................34!
15.!Raw Water Pump Impellor Change (Work Boat & River Boat) ..................................34!
16.!Engine Heat Exchanger Tube Stack Flushing............................................................35!

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17.!Winterization of Seawater Cooling System (Work Boat & River Boat).......................35!
SECTION 6 – Service Schedule....................................................................37!
1.!Specifications and Capacities ....................................................................................37!
2.!Service Intervals.........................................................................................................37!
SECTION 7 – Wiring Diagrams .....................................................................39!
1.!Engine Wiring Diagram Shire 30, 40, & 50.................................................................39!
2.!Standard Control Panel Wiring Diagram ....................................................................40!
3.!Deluxe Control Panel Wiring Diagram........................................................................41!
4.!RDG20710110 – Standard Control Panel ..................................................................42!
5.!RDG20710111 – Deluxe Control Panel .....................................................................42!
6.!Overall Dimensions of the Control Panels..................................................................43!
7.!8kW Travel Power Wiring Diagram and Overall Dimensions .....................................44!
SECTION 8 – Technical Data ........................................................................46!
SECTION 9 – Dealer List ...............................................................................47!
SECTION 10 – Shire Service Parts...............................................................49!
SECTION 11 – Shire Service Record Card ..................................................51!

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SECTION 1 – Safety Precautions
1. General
It is the responsibility of the installer/operator to ensure that the finished installation
complies with the relevant Health & Safety requirements and the recreational craft directive
before commissioning.
Ensure that the engine battery isolator switch is in the off position and the key removed
from the control panel before carrying out any maintenance or repairs.
2. Lifting
The Lifting points supplied with the engine are for lifting the engine/gearbox only. A suitable
spreader bar must be employed to prevent over-stressing either bracket during any lift.
3. Rotating Shafts and Belts
The engine and its accessories are not intended to be put into operation until they are
integrated into the boat as a whole. No person should be in the engine compartment and
the engine cover or deck hatches should be closed whilst the engine is running.
4. Exhaust System
Exhaust gases may have temperatures as high as 650°C and contain elements which are
harmful if ingested.
It is therefore essential that exhaust systems are gas tight and lagged to prevent accidental
burning.
5. Launching and Lifting Boats
Care must be taken when launching or craning new boats into or out of the waterway, so
that water does not enter the engine via the exhaust system or air vents. It is recommended
that these are blocked temporarily whilst undertaking this procedure.
6. Batteries
WARNING:
EXPLOSIVE GASSES / SULPHURIC ACID
•Batteries can produce explosive gases; keep sparks and flames away from the
battery.
NO SMOKING
•Batteries contain sulphuric acid; if splashed on skin or eyes, flush well with water and

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seek medical advice.
•Keep battery tops and battery compartment ventilated at all times
•If disconnecting the battery; remove the earth lead FIRST; and re-connect it last.
•If charging the battery; ensure that the charger is switched off before connecting and
disconnecting.
•Do not tip the battery on its side.
•Please see label on battery or manufacturer’s instructions for specific information.

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SECTION 2 – Engine Identification
Please quote the engine identification number during any enquiry or when ordering spare
parts. Use the space below to record these details.
This can be found engraved into the brass plate on the top of the engine rocker cover and
stamped to the crankcase next to the starter motor.
An example of the engine identification plate is shown below (Figure 1):
Description of Models:
CB: Canal Boat Engine: Keel cooled dry exhaust manifold.
WB: Work Boat Engine: Seawater / Heat Exchanger cooled, dry exhaust manifold
with either dry exhaust system (same as a Canal Boat) or
water injected exhaust system.
RB: River Boat Engine: Can also be used for sea going applications. Seawater / Integral
exhaust manifold, heat exchanger cooled. Water injected exhaust system.
Note: There are a number of optional extras that may be fitted to an engine that are not
listed here.
A list of common item service part numbers can be found in Section 11, Shire service parts.
Figure 1: Engine Identification Badge
SHIRE
1550$D$XXXXX
Indicates Model Type or Optional Extras:
RB = River Boat
WB = Work Boat
D = Deluxe Panel
3 = 3:1 Ratio Gearbox
Engine Model
Build Number
Serial Number

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SECTION 3 – Installation
1. Ventilation
•All internal combustion engines radiate heat and require cool, clean air to aid
complete combustion.
•Please Ensure that adequate engine room ventilation is provided, by fitting at least
two vents of an aperture of not less than 10,000mm2 each (16in2).
An allowance must be made for any grills, louvres or bends placed in the airflows
and generally an increase of 25% in area is sufficient to overcome any restriction
problems.
2. Engine Beds
•These should be a minimum of 10mm thick, extended rearward and be welded to the
hull and forward to the bulkhead. Webs or gussets must be welded in place midway
to prevent flexing.
3. Pressurised Water Header Tank
•The pressurised header tank should be mounted higher than the level of the engine
and no more than 1 metre from the engine. This is to prevent cooling system air
locks.
4. Shaft Connection and Propeller Selection
•Some type of flexible coupling must be used to connect the gearbox output flange to
the propeller shaft flange. Various coupling flanges are widely available to assist with
this.
Note: Underperforming engines will not be covered under warranty if the cause of the poor
performance is found to be due to the use of an inappropriate propeller.
5. Engine Anti-Vibration Mounts
•Ensure that the engine feet do not end up at the top of the thread on the engine
mounts, this puts undue pressure on them and can result in excessive engine
movement and premature mount failure. If this is a problem put steel packing plates
under the mounts. Packing plates 25mm thick are available: Order RDG3906 Engine
mount spacer. Alternatively they can be manufactured locally.
•On the Shire 30 WB/RB there are two different sizes of Anti-Vibration Mounts used.
The small mounts are used at the front of the engine along with spacer blocks. The

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large mounts are used on the back of the engine.
•Ensure that the engine has been installed for at least 24 hours before shaft
alignment is checked, to allow the mounts time to settle under the engine weight.
•Ensure that the anti-vibration mount centre screw is sufficiently raised so as not to
touch the engine bed. If this occurs, excessive engine vibration will be experienced
through the hull.
•For best results, fit the front AV mounts into the front holes in the engine rails. If the
engine room space is a problem the mounts can be fitted slightly further back in the
alternative holes and the front of the rail cut off – leaving 50mm of material to retain
strength (measuring from the centre of the mount hole to the front end of the rail).
Note: This procedure is only possible on non VDO Travel Power engines, and may
result in a very slight increase in vibration. AV mount installation points are shown
on (Figure 4)
Figure 2: Correct Anti-Vibration Mount Installation

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Figure 3: Correct Anti-Vibration Mount Installation
Figure 4: Anti-Vibration Mount Installation Points
6. Engine Alignment
•The gearbox output shaft flange and propeller shaft input flange must be almost
perfectly aligned. A maximum of 0.05mm (0.002”) misalignment in any plane is
acceptable. Ensure alignment is recheck after the first 4 hours of running, after the
first month and thereafter annually.
Alternative mounting
position if engine
compartment space is
Normal mounting position

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•If the engine is out of alignment it will result in excessive vibration and possible
damage to the stern tube and propeller shaft.
•Boats that are fitted with fully flexible drive couplings should still have the engine and
shaft alignment as close as possible. A dummy shaft may be required for this
purpose. Note: Some types of flexible shaft couplings require the input and output to
be misaligned, check with the coupling manufacturer’s installation instructions.
•Minimum clearance of 25mm between rails and engine beds.
7. Electrics
•Do not attach any part, hose or cable to the engine wiring harness. There is a
warning label attached to the harness to remind you of this.
•Connect the wiring extension harness multi plug to the panel plug and the other end
to the engine.
•Connect the start battery positive cable to the starter motor solenoid terminal.
•The starter motor battery cable must have a cross sectional area of at least 50mm2.
•The engines are fitted with a single 50A alternator as standard.
•A single 70A Alternator can be fitted in place of the 50A Alternator as an option.
•There is a further option to have two separate alternators fitted to the engine. The
standard 50A alternator and either an additional 12V 140A alternator or 240A
alternator can be fitted. This option is used to charge the batteries for the domestic
electrical system.
•For twin alternator engines, connect the domestic battery positive cable to the 140A
or 240A Alternator. The 140A alternator has a B+ terminal and the 240A alternator
has a “pos out” terminal (see wiring diagram). This ensures that the 50A alternator
charges the start battery and the 140A or 240A alternator charges the domestic
battery. This removes the requirement for a split charging system or relay.
•The engine is supplied with the domestic alternator belt not fitted. This is so that
domestic alternator damage does not occur if the engine is run without the domestic
battery back connected. The belt should only be fitted when the domestic battery
bank has been connected to the domestic alternator. Belt fitting and tensioning
instructions are in Section 5 – Service Procedure. Make sure the alignment is
correct.
•A cable will need to be manufactured locally and fitted between the lower 140A or
240A alternator and domestic battery positive terminal. The cable should have a
minimum cross sectional area of:
40mm²for Shire 30, 33, 35, 38 and 40 (140A Alternator).
70mm²for Shire 45 and 50 (240A Alternator).
•Both negative battery terminals can be connected to a common earth point.
Note: The 240A alternator is of the insulated earth design and requires a heavy duty earth

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cable installed at all times.
8. Electrical Options
•If the engine is fitted with the optional 230V Travel Power System, refer to the
manual supplied with it for correct wiring, control box installation and operation.
•The Shire range can be supplied with other optional additional 12V or 24V
alternators. This will be supplied fitted but not wired. It is the responsibility of the
boat builder to ensure that this is correctly wired to the boats electrical system.
9. Engine Oil
•All Shire engines are supplied fully run in.
•Check oil levels in engine and gearbox before starting
•Use good quality engine oil SAE 10W / 40 API class CD.
WARNING:
ENGINE OIL WITH A HIGHER API CLASS THAN CD IS UNSUITABLE FOR CANAL
BOAT OPERATION AND WILL CAUSE ENGINE DAMAGE IF USED.
10. Fuel
•Ensure the main fuel tank is clear of dirt and water.
•A separate water trap must be fitted to all engine installations. The engines are
supplied with an additional fuel pre-filter water trap as standard.
•Connect fuel feed return hoses from engine to main supply and return lines to main
fuel tank, ensuring they are connected the correct way around. The hose to the
electric fuel pump is the inlet.
•The engine hoses are supplied with 5/16” (8mm) OD metal hosetails and should be
securely fitted to the main supply and return pipes with compression fittings.
•The engine hoses should have sufficient slack to absorb engine movement without
placing strain on the hoses and be securely clipped to prevent accidental damage
and chafing.
•Initially fill the fuel system by turning the ignition on to operate the electric fuel pump.
Loosen the bleed screw on the top of the primary fuel filter / water trap and close
when fuel begins to flow clearly (no bubbles). The rest of the process is done
automatically by the engine. It is rarely necessary to bleed the injection pump or
injectors upon installation as the engine will already have fuel in it from the engine
run in and test procedure.

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11. Coolant
•Prepare coolant mix of 50% clean tap water and 50% antifreeze.
For Workboats:
•Ensure the top header tank connection goes to the small hole connection on the
tank.
•To fill the engine cooling system for the first time:
•For the Shire 30WB and 40WB fill the system through the header tank filler
cap.
•For the Shire 50WB fill the system through the exhaust manifold filler cap and
then through the header tank. Note: The water cooled exhaust manifold is an
option for the Shire 40WB.
•After filling up the cooling system, start and run the engine for several minutes to
dispel any remaining air bubbles with the pressure cap removed.
Note: After running the engine for the first time, stop the engine and monitor the water level
frequently as trapped air bubbles may be expelled. Top up the system as necessary.
Figure 5: Shire 50 Coolant Filling Points
For Riverboats with Water Cooled Manifold:
•Remove filler cap on top of water cooled manifold and fill cooling system through
here.
•Run the engine at idle for a few minutes with cap removed to ensure air is removed
and allow a 13mm (1/2”) air gap in top of manifold to allow for expansion.
12. Control Cables
•Connect engine speed control cable. With the engine off, ensure that the engine
Exhaust Manifold Filler Cap
Header Tank Filler Cap

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speed control lever achieves full travel from idle to full speed. Adjust if necessary.
•Check the gearbox shift lever selects positively and that the drive direction
corresponds with the gearshift control lever. Ensure that the gearbox control lever
and the gearshift lever are both in neutral before connection. Adjust if necessary.
13. Domestic Battery Bank
Domestic battery banks that are too large create excessive loads on the domestic
alternator. Alternators running at maximum output for prolonged periods of time will
eventually fail prematurely; alternators that fail due to the battery bank being over the
maximum recommended size will not be covered by warranty.
Higher output additional alternators, or travel power kits are available: if larger battery
banks are required discuss your individual power requirements with the boat builder or
engine supplier.
•The maximum domestic battery bank is calculated using the following:
- Live aboard, three times domestic alternator, maximum output current.
- Weekend cruising or hire fleet use, three and a half times domestic
alternator, maximum output current.
Example 1:
Live aboard application fitted with a 140amp domestic alternator
3 x 140 = 420 ampere/hour maximum battery bank size
Example 2:
Weekend cruising or hire fleet application fitted with a 240amp domestic alternator
3.5 x 240 = 840 ampere/hour maximum battery bank size.
14. Seawater Strainer
•A bulkhead mounted seawater strainer or similar is NOT supplied with the engine.
We recommend that one is fitted between the seawater inlet (seacock) and the sea
water pump inlet.
15. Control Panel
All Shire engines are supplied with high quality engine control panel that all show RPM and
hours run and include warning lights and a warning buzzer. The deluxe panels also have
additional gauges for the water temp, oil pressure and battery charging. The panels are
designed to be splash proof and are correctly installed with the gauges vertical. Do not
install so that they remain out in the open, or cover up when not on use.
The control panel engine tachometer is supplied already calibrated to measure correct

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engine speed. If a new control panel, tachometer or alternative alternator is fitted, the tacho
will require re-calibrating.
Control Panel Calibration Procedure:
•Connect control panel plug to engine wiring loom plug.
•Turn ignition on (do not start engine).
•Press and hold black button on rear of tacho until “H-“appears on the digital display
at the bottom of the tacho (on the front).
•When pressing and holding the black button on rear of tacho, the value displayed will
increase / decrease until the button is released. Then when pressing again it will
increase / decrease in the other direction. Keep doing this until the digitally
displayed value on the bottom of tacho reaches the correct value, according to the
type of alternator (see below table). This must be set to the alternator with blue and
black wire connected to it.
•Confirm settings to tacho meter reader.
•An optical tachometer is required to check the reading.
Barrus Alternator (Amps)
Barrus Tacho reading
50
10.50 – 11.00
70
15.00
140
19.50 – 20.00
240
22.00
Alternative or non-standard alternators will require calibrating and checking by trial and
error, with a hand held tacho until the engine speed and indicated tachometer speed are
the same.
Engine energise to stop systems are available as an optional extra.
16. Seawater Pump Hose Minimum Inlet Size
•Shire 30WB: 20mm (approx ¾”)
•Shire 40/50WB: 25mm (approx 1”)
Note: A Suitable reinforced, non-collapsible hose must be used.
17. Exhaust System
Work Boat with Dry Exhaust:
The exhaust outlet size on the engine is 1½” BSP female. There must be a flexible exhaust
hose of suitable exhaust grade between the engine and the silencer or hull outlet. The
outlet must be a minimum of 300mm and above the waterline at all times. The exhaust

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fittings and silencer (if fitted), must not be smaller than 1½” BSP. Exhaust silencers, flexible
exhaust hose connections and lagging blanket are all available as optional extras:
Part Description
Part Number
Exhaust Coupling 1½” x 1½” BSP
RDG1916
Exhaust Silencer DSA-38
RDG1911
Flexible Exhaust Hose (18”)
RDG1879
Blanket 18” Flexy Exhaust
RDG2477
•Make sure the exhaust increases then decreases in height as shown above.
River Boat with Water Injected Exhaust:
If the engine is installed low down in the boat, below the outside water level, a system such
as a Lift Silencer with a siphon break system, must be used to prevent sea water from
flowing back down the exhaust and into the engine.
•Lift Silencer
The correct installation of the lift silencer is vital to safety, and to avoid back flooding of
the engine. Figure 6 shows how to install the lift silencer correctly (Note: Halyard (M&I)
Limited have given Barrus permission to use the diagram).
ü
X

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Figure 6: Correct Installation of the Lift Silencer
1. The swan neck must reach at least 450mm (18”) above the waterline, when
installed on hull centreline.
2. The top of the silencer should be at least 300mm (12”) below the water injection
point.
3. The silencer must be installed as near as possible to the centreline of the hull,
particularly where severe angles of heel are expected. The swan neck must be
450mm above heeled water line.
4. Remember that 15% of the volume of the exhaust hose may be water. The size
of the silencer selected must be such that water draining into it will fit it by no
more than one third.
5. A siphon break must be used.
The silencer may only be used in a Water Injected marine exhaust system. The overall
design of the system, and choice of components, will have a result on the back pressure in
the exhaust which is vital to the performance and life of the engine. Barrus recommend
that Halyard (M&I) Limited are used for the Lift Silencer, Siphon Break and other
components. Contact Halyard (M&I) Limited for further information.
The silencer must be drained before the boat is craned or transported and during the
winter.
There must be at least 450mm distance between the water injection point and the position
of the silencer to allow adequate cooling of the exhaust gases. Maximum temperature
during continuous operation of the silencer is limited to 85 degrees centigrade. Normally in
a well-designed system, the temperature of the silencer should be between 50-70 degrees
centigrade. Such operation will result in longer exhaust life.
Connections to the silencer should be made using suitable exhaust hose, which is type