Westerbeke 46 User manual

OPERATOR'S MANUAL
WESTERBEKE 46
Marine Diesel Engine
Publication # 34468
Edition Two
May 1986
AVON INDUSTRIAL PARK, AVON, MA 02322 • TEL: [phone]
TELEX: 92-4444. FAX: [phone]· CABLE: WESTCORP

FOREWORD
Thank you for having selected a Westerbeke
Diesel Engine for your use.
This manual describes the procedures for proper
handling and routine maintenance of:
W-46
Marine Diesel Propulsion Engines
To obtain best operating condition and longest
service life, it is important to use it sensibly
and carry out operation and maintenance according
to this manual.
If you have questions about your equipment or
in the event of a failure, please contact your
nearest distributor or dealer.
If, within 60 days of submitting your warranty
registration card, you have not received a Customer
Identification Card (see below) registering your
warranty, please contact the factory in writing.
We look forward to your continued patronage.
from: J.H. Weslerbeke Corp.
Avon Industrial Park
Avon, MA 02322
r/~1
J. H. WESTERBEKE COR~
•
AVON '''ov.r~'A< p",,~, AVON, .. AU. oun
CUSTOMER IDENTIFICATION
W-46
1234C408
Pleasure Craft
Mail To: expi res 9/15/85
Adam Smith
85 Maple Street
Alden,
IN 12234
~ ~
1

TABLE OF CONTENTS
PAGE
GENERAL SPECIFICATIONS •....•••••••••• 3
INSTALLATION, PREPARATION
AND SUPPLY
CAUTIONS. .. • .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .... 5
1. BREAKING IN.......................................... 7
2.. STARTING SySTEM................................. 8
3. INSTRUMENT PANEL USE ••••••••.•.• 9
4. STARTING PROCEDURES ••••••••••••• IO
5. STOPPING PROCEDURES ••••••••.•••. ll
6. CAUTIONS ON STARTING
AND OPERATION ..................................... 11
7. REQUIREMENTS FOR PROPER
OPERATION
7-1 Lubrication System ••••••••• 13
7-2 Fuel System .••.••....••.•.. 14
7-3 Wiring Diagram .•••• Centerfold
7-3 Cooling System •••••....•••• lS
7-4 Belt Tension ............... 20
7-6 Domestic Hot Water ..••••••• 20
7-7 Cylinder Head & Valves .••••• 24
S. RECOMMENDED MAINTENANCE SERVICE.25
9.. TRANSMISSIONS .... ................................ .. 28
10. TROUBLESHOOTING ••••••••••••••••• 40
11. TABLE OF TIGHTENING TORQUES •.••• 41
12. COMMON PARTS BY NUMBER •••••••••• 43
13. LIMITED WARRANTy ••••••••••••...• 44
2

GENERAL SPECIFICATIONS
Model
Type
Westerbeke 46
4-cycle, fresh water cooled diesel engine
with raw water exchanger system
*& Arrangement of Cylinders 4 cylinder-vertical-in line
Bore & Stroke
Dry Weight
Total Piston Displacement
Compression Ratio
Firing Order
Rotational Direction
Fuel
Lubricating Oil
Oil
Pressure
Intermittent Power
Westerbeke Rating
Continuous Power
Idle Speed
Cruise R.P.M.
Lubrication
Oil Pump
Oil Filter
Oil Sump Capacity
Cooling System
Operating Temperature
Fuel System
Fuel Injection Pump
Fuel Injection Nozzle
Governor
Fuel Filter
Starting System
84 X 90mm (3.30 X 3.70 in.)
535 Ibs. (242kg)
2084cc (127 cu. in.)
21 : 1.
1 - 3 - 4 - 2
Clockwise as viewed from front of engine
*2 fuel oil (cetane rating 45 or better)
Mineral oil, heavy duty, A.P.I. CC or CD
Idle 20 - 30 P.S.I. (1.75 - 2.46 kg/cm
2)
Under power 30 - 60 P.S.I.
(2.46 - 4.21 kg/cm
2)
47.5 horsepower at 3000 RPM
46 horsepower at 3000 RPM
43 horsepower at 3000 RPM
700-850 RPM
2000-2500 RPM
Forced lubrication
Trochoid pump
Full-flow type with paper element
7 quarts & filter
Forced circulation by centrifugal pump
with thermostatically controled temperature
170 - 190· F
NIHON-CAV
distributor type
Bosch type, DNOSD
Flyweight type, built in pump
with paper element
Electric starter with glow plugs in head
3

starter
Alternator
Battery
Raw Water Flow Rate
Propeller Recommendations
(using HBW-150 1.8S:1
reduction)
12V, 1.6KW pinion shift type
12V - 50 ampere
12V - 100 ampere hour
9.5-10.0 gallons/minute at 3000 R.P.M.
measured at discharge into exhaust elbow
lSD x 10P-2 blade or lSD x SP - 3 blade
propeller should allow engine to reach
its rated RPM (3000 + 100) at full
throttle underway
4

INSTALLATION, PREPARATION AND SUPPLY CAUTIONS
* Check important aspects of installation before operating engine.
(1) Alignment (Error to be no more
than one thousandth of an inch
per inch of coupling diameter)
(2) Provide sufficient ventilation
(3)
Provide adequate service room
around engine (See warranty
clauses)
003 ~EELER GAGE
STRAIGHT EDGE
CHECKING COUPLING ALIGNMENT
* Fill fuel tank with CLEAN *2 diesel from a reputable manufacturer.
*
*
*
Fill engine sump with lubricating oil
(Select readily available lubricating
(Sump capacity 7 quarts).
to full mar k on dipstick
oil of grade CC or CD)
Fill freshwater cooling system with suitable mixture of water and
antifreeze to suit your temperature zone. Thoroughly mix
antifreeze and freshwater BEFORE adding to cooling system.
Plug-in Panel Harness Connection. After assembly, joint should be
taped to prevent corrosion or, preferably, assembled using a sili-
con grease which can be obtained at an electronic store such as
Radio Shack.
SAFETY PRECAUTIONS
*
*
*
*
*
*
*
*
Never operate engine with inadequate ventilation. Confirm that
there are no exhaust leaks inside engine compartment.
Do not touch moving parts during operation.
Do not touch hot parts such as exhaust pipe, and do not place com-
bustible materialS near the engine.
Inspect and adjust parts of the engine only after it is stopped.
Check and refill engine oil, cooling water and transmission lubri
cant only after the engine is brought to a stop.
A coolant recovery bottle was supplied with the engine together
with instructions for installation. Be sure that it is in place.
Attempting to operate with only the manifold as an expansion tank
exposes the operator to a severe steam burn if the manifold pres-
sure cap is removed while the engine is hot. Follow instructions
on page 6.
Always use tools that fit correctly and use caution during ser-
vicing.
Be sure that current carrying wires are protected from abrasion
and that all connections are tight.
5

PREPARATIONS
Take steps as shown below in starting your engine for the first time
or after a prolonged shut-down.
1. a) F ill your eng ine wi th oil
up to or near the upper limi t
on the dipstick. Use a good
grade of oil with API specifi-
cation of CC or better. For
quantity of oil, you may refer
to the General Specifications
page.
b) Fill
with the
NOTE: Some
separately.
the transmission
proper lubricant.
V-Drives are filled
2. Your engine is supplied with a
coolant recovery system to
which the following instruc-
tions apply:
a) Fill engine completely to
the neck of the manifold cap.
b) Then fill the recovery
tank to the bottom add line.
Need for adding coolant is
indicated when a cold engine
has coolant level below the
bottom add line.
c) In winter add antifreeze
as described on page 18. A
mixture of antifreeze should be
used year round and changed as
needed.
3. Fill the fuel tank with *2
Diesel fuel with *45 Cetane
rating or better. The interior
of the fuel tank must be main-
tained clean. Be careful not
to allow introduction of dir t
when filling fuel.
4.
Engine oil, coolant
transmission levels should
checked at least once a
prior to engine use.
and
be
day
6
oil filler port
oil
orllevelgauqB_~,J
and ftllerport
lower/lm;t 7---- -- _ oil ~---~-_
COOLANT RECOVERY TANK

BREAKING IN YOUR NEW ENGINE
While your engine has had at least one hour of test operations to
demonstrate accurate assembly and correct operation of all systems, it
still requires break in time.
Service life of your engine is dependent on how your engine is
operated and serviced during initial break-in hours of operation.
Your new engine needs approximately fifty hours of initial con-
ditioning operation for breaking in each moving part, thus helping
maximizing performance and service life of engine. Perform this con-
ditioning carefully, keeping the following points in mind.
1. Start engine, run at idle while checking that all systems are
functioning - sea water pump, oil pressure, battery charge.
2. Warm engine, prefer ably by running propeller at fast idle
while tied down, until water temperature gauge moves into the
130 - 140 degree range.
3. Then use engine at moderate load (RPM) until normal engine
operating temperature of 170 - 190'F (77 - BS'C) is reached.
4. Avoid rapid acceleration especially with a cold engine.
5.
Use caution not to overload engine. Grey
sign of overload. Select the correct
engine and transmission reduction.
or black smoke is a
propeller for the
6. Operate the engine in moderation, varying the running RPM
under load during the break in period.
Explanation:
"Breaking in" a new engine is basically a seating of the piston rings
to the cylinder walls. This is not accomplished by long periods of
running idle, nor by early running under full load.
Idle running may glaze the cylinder walls causing oil consumption and
smoky operation. Excessive speeds and loads may score cylinder walls
with similar results, especially with the engine cold.
As indicated above, operate the engine in moderation during the ini-
tial 50 hours of break in. Don't baby it, yet do not abuse it.
7

DESCRIPTION OF STARTING SYSTEM
Model W-46 uses an electr ic
starter assisted by glow plugs
for both normal and cold weather
starting. The figure is a cross
section through one cylinder.
The glow plug enters the com-
bustion chamber so that the end
is in the spray path of the
injector nozzle. When the glow
plugs are energized by the pre-
heat button, they glow red at the
tips and assist rapid ignition of
the fuel. The result is rapid
starts with less wear on the
starter.
This system is common to
Westerbeke Diesels. The star t
circuitry is designed so that,
first, the preheat button must be
depressed for the time specified
in the glow plug use char t shown
below.
Glow Plug
Injector
After which, and while keeping the preheat button engaged, the start
button is depressed to crank the engine.
Glow Plug Use Data
Atmospheric temperature Preheating
time
+S'C (+41"F)
or
higher
Approx" 10
sec.
+S"C (+4l'F)
to -S'C (+23'F)
Approx,
20
sec"
-SoC
(+23"F) or lower Approx.
30
sec,
Limit of
continuous use
1
minute
For complete starting and stopping procedures, see pages 10 and 11.
8

INSTRUMENT PANEL Description and use of:
Note 1: When engine is stopped after use, the water temperature and
oil pressure gauges may stay at their running readings.
Note 2: When engine is next to be used, turn keyswitch ON. The
temperature and pressure gauges will "ZERO" and the voltmeter
will register battery voltage. The elecric fuel pump,
mounted on the engine, will also begin to operate, purging
any air accumulated in the system.
Note 3: The engine is now prepared for starting.
Note 4: For INITIAL STARTS:
The self-priming feature of the W-46 is different from other
models in that it requires longer time. Two circuits are
required to bleed both fuel filter and injecion pump.
Therefore, when priming the W-46 for the first time or when
the system has been wor ked on or has been run out of fuel,
allow the electr lc fuel pump to oper te for 2 to 3 minutes
before the first cranking effort. simply turn the ignition
key ON to activte the electric fuel pump.
9

STARTING PROCEDURES
1. Advance throttle to full, press Preheat button and hold for the
number of seconds indicated on Page 8 in "Glow Plug Use Data".
2. While still engaging Preheat button, press Start button.
Note: Failure to engage the Preheat button will not allow the
Starter button to energize the starter.
3. The starter will crank the engine which should start in 10 seconds
or less.
4. As soon as the engine starts, release buttons and throttle back to
a moderate idle warm up of 80 - 1000 RPM.
5. Should the eng ine NOT star t even though cr anking for 10 seconds,
release the buttons for 30 seconds and repeat the sequence by pre-
heating the glow plugs sufficiently. The starter motor should
never be run more than 30 seconds at a time.
6. Proper glow plug function is
indicated by voltmeter drop
when the Preheat button 1S
depressed. This drop will be
slight but discernible. If no
vol tage drop is noted, it may
indicate defective glow plugs
or a faulty preheat circuit.
(Check for loose connection).
7. As soon as the engine has started, release both Start and Preheat
buttons. Check that with engine running, oil pressure and battery
charge voltage are registering and that raw water is discharging
with the exhaust.
Note: An alarm buzzer is supplied with every unit. It is the
responsibility of the installer to electrically connect the alarm
buzzer to the two marked terminal connections on the engine
electr ical harness and install the buzzer in a dry location so
that it will be audible to the operator should it sound during
engine operation. This buzzer will sound when the ignition key is
turned on and should silence when the engine is started and oil
pressure rises above 15 Ibs.
8. To warm up engine, run a few minutes at idle to make checks in '7'
above. Then operate under reduced RPM until water temperature
rises into the 140· range. Then operate under moderate power
until normal operating temperature is reached.
10

STOPPING PROCEDURES
1.
Model W-46,
'T' handle
engine.
early models were supplied with a manual shut-off. A
or knob is pulled to shut off fuel, stopping the
Later Models June 1985 (C506) on, were supplied with an electric
shut-off operated by the key switch and having the manual shutoff
as an installer's option.
2. With the engine stopped, it is necessary to turn off the key-
switch. If you fail to do this, the panel remains energized and
the electric fuel pump continues to run. This oversight results
in a dead battery. with the alarm buzzer installed and
functioning, it will sound when the engine is shut down manually
and the keyswitch left ON signaling to turn the key off.
CAUTIONS ON STARTING AND OPERATION
1. Normal starting
Follow the procedures below for routine starting of your engine.
1) Check the engine and transmission oil levels and refill if
necessary.
2) Insure that you have sufficient fuel. Keep tank as full as
possible.
3) Check cooling water level, and refill if necessary.
Note: Check for leaks of water or oil, particularly when
signs of such leak are found on the bottom of the engine or
in the drip tray when provided.
4) Start the engine in accordance with the procedures given on
the preceding pages.
5) Allow the engine to warm up to 140'-150' F before placing the
engine under heavy load.
2. Starting under cold conditions
The following three adverse conditions concur as the atmospheric
temperature drops exceedingly, and the engine must, under such
conditions, be started by taking steps described below:
LUBRICATING OIL TURNS VISCOUS Make certain that viscosity
is proper for the prevailing atmospheric temperature. Check
the oil also for deterioration. (Study page 13.)
VOLTAGE ACROSS BATTERY TERMINALS DROPS
battery is fully charged.
Check that the
THE TEMPERATURE OF
TEMPERATURE DOES NOT
operate sufficiently
INTAKE AIR
RISE ENOUGH
IS LOW AND COMPRESSION
Allow the glow plug to
See table on page 8. to aid starting.
11

3. Cautions during operation
Confirm that the oil pressure is normal during operation.
Confirm that exhaust gas is as follows:
* While engine is cold •••••••••..••...••••• White smoke
* When the engine grows warm •••...••••••••• Almost smokeless
* When the engine is overloaded .•••••••... ~Some black smoke
Check for abnormal noise such as knocking, friction or leaking
sounds, and vibration and blow-back sounds.
Check for leaks of fuel and engine oil.
A knocking sound is normal while the engine is cold, during quick
acceleration and at idle. Confirm that no knocking sound is heard
in other cases.
Photo above is right hand side of the W46 with Hurth 2:1 reverse
and reduction gear.
12

REQUIREMENTS FOR PROPER OPERATION
LUBRICATION SYSTEM
1. Engine oil
For engine lubrication, use diesel engine oil. Diesel engine oils
are classified according to the API Specifications into grades CA,
CB,
CC and CD. Anyone of them is usable, but use of CC or higher
grades prepared by well-known makers is recommended. The oil
selected should be used thereafter,
2. Engine oil viscosity
Use oil having viscosity best suited to the atmospheric tem-
perature. Use of an all-season oil SAE10W-30 with minimum visco-
sity change under different temperatures is suggested"
Atmospheric temperature Viscosity
20"C (6S"F) or higher SAE 30 or 10W-30
S"C (41"F) - 20"C (6S'F) SAE 20 or 10W-30
S"C (41'F) or lower SAE 10W-30
3" Oil pressure
The oil pressure during operation of the engine is indicated by
the oil pressure gauge.
During normal operation .••••••••••• Oil pressure will range between
(Under Power) 30 and 60 PSI.
(2.10 - 4.21 kg/cm
2)
At idle speed ...•..•••... e ••••••••• 20 - 30 P.S.I.
(1.7S - 2.10 kg/cm
2)
At the time of cranking •••..••••.•• Pressure will rise proportion-
ately with speed.
4. Replacement of oil filter
Being a replaceable car tr idge
type, the oil filter requires
no cleaning inside.
In installing the oil filter
element, apply engine oil
thinly on to the O-ring, and
then tighten it by hand firmly.
When removing the used filter,
cover over wi th a plastic bag.
This will allow both filter
element and spilled oil to be
collected cleanly without
spilling oil in the bilge,
13
OIL DRAIN SYSTEM

5.
Note A:
Note B:
After-market filters are not recommended
material standard or diameters of important
be entirely different from genuine parts.
since the
items might
Immediately after filter
engine to ensure that oil
there are no oil leaks.
change and oil filler, run
pressure is normal and that
Engine oil change:
(including filter)
Initially at 50 hours then every 100 hours of
operation
To renew engine oil, discharge old oil through the sump drain hose
attached at front of engine while engine is still warm.
Drain old oil completely, replace the hose, plug the end securely
and add fresh oil through the oil fill cap on the valve cover.
After refilling oil, idle the engine for several minutes and stop.
Then check the quantity of oil by the oil level gauge. Fill to
but not over the high mark on the dipstick. Always observe old
oil as it is removed. A yellow/grey emulsion indicates presence
of water in the oil. While this condition is rare, it does
require prompt attention to prevent serious damage. Call a com-
petent mechanic.
FUEL SYSTEM
1. Diesel fuel
2.
USE #2 DIESEL FUEL. NEVER USE KEROSENE OR HEAVY OIL.
In cold weather particularly, water vapor is produced by conden-
sation when air is present in the fuel tank. The tank, therefore,
should be kept full as much as possible.
The fuel tank, furthermore, needs to be kept completely free of
dirt and water.
It is required that a primary
fuel filter of the water
entrapment type be installed
between the fuel tank and the
engine. Such a filter, shown
here, is available under Par t
#32974 from your local
Westerbeke representative or
your: boat builder. This f U-
ter, adapted for boat builder
use, comes complete wi th f i t-
tings for either hose or metal
tubing. Mount in an accessible
place, inspect often and drain
off water accumulation fre-
quently.
14
HOSE FITTING 8 9
TUBE PIPING
HISTR, '33~09
5EDJHi:t1T,·:nj'.;AT[H TRAP ;)2974
Bolt :';,'(];m~"tel!~'atcr 'no?
S~GLlr~ly to an aC('Pcslole
,tl\1e\urf' ~D positioned th"t B
r~cept"c)~ to '"0 Lcll c,,,,nage
,-"" "r !,l<,c~(l LJ~d~r.
2. If 'up I is to be pi!,e<l with
cq'[)'" 01 hundy ':utdng, use
nut~ an,j tcr,ules jlrovl<le(l. Be
SLlre th" lUbing I',-o)ects 1/4
inch th"-'Llg~ the [",r"le b€fo,~
tiqhteninq t,no nut.
It [ud )5 to b~ pip~d with
11D5~. LJS~ ,hp two I>r,,05 narl>eo
[itL,lr.g~ dm) ,"""hprs suppiied,
~~ cert.Hn lhat the hose
oeiectell hao diagonal braid
In",'' t~d (to clln~ on the
bar,,). that j( js neoprene
lined and that it " USCG
4, It ~'",pr 's p<es~nt 1" ihc
fuel. it will collect dowly in
th~ bottom of the Se(!i",ente<,
\;hen tlw red float r1ng r~.Khes
th~ dr"i~ line on the plastic
bowl. loo,wn the bottom drain
plug unU] all water runs out.
5, 'l'ightEn d<ai~ plug o,"curely 50
~o a1t eiln enter 8ySl~m,
Ii. Energiz~ [uel pump to refill
bow) .

If a water trap type filter is not interposed between the fuel
tank and engine lift pump, any entrained water will tend to lay in
the bottom of the electric lift pump. Internal metal parts of the
lift pump will rust. Particles will pass on to filters and
eventually to injection pump and injectors with damaging and
expensive results. IT IS WELL TO REMEMBER THAT WATER DAMAGE TO
THE FUEL SYSTEM IS NOT COVERED BY WARRANTYl
While many boat builders do supply a water trap filter, there are
some who do not. It is to prevent such omission that Westerbeke
offers a sedimenter/water trap filter as a desirable optional
extra at moderate cost. It is supplied with fittings for either
hose piping or metal tube piping.
Priming and self bleeding. All engines covered by this manual
have a fuel filter with hand priming pump in the head casting for
emergency use. The main priming source is the electric lift pump
mounted on the cylinder head front.
The Westerbeke self-bleeding fuel system on Model W-46 is semi-
automatic. If you run out of fuel, perform a filter change or any
disassembly of the fuel system, the system will then contain air
which may prevent the engine from starting. In such event, turn
the keyswitch on, allow electric pump to run for two minutes,
and crank engine for approximately seven seconds. If the engine
has not started, wait for approximately thirty seconds more of
electric pump action and crank engine again. These time periods
may vary from engine to engine.
Note: The self bleeding feature on the W-46 relates to the
engines's fuel system only.
INJECTORS -- :::==------::a~%S:lff.~1iP
ELECTRIC LIFT PUMP
___ FUEL FILTER
THROTTLE CONNECTION
INCOMING FUel
INJECTOR PUMP
BUFFER SCREW
15

3. Notes on fuel system
See on prior page a typical exploded view of a fuel system for
this engine. It is also illustrative of the self-bleeding and
priming system used by Westerbeke.
The Westerbeke self-bleeding fuel system is semi-automatic in
operation. While it is unlikely that the operator will be forced
to service the system at sea, the possibility does exist.
Therefore, it is recommended that banjo washers, injector seat
washers, lift pump filter and gasket, fuel filter and gasket be
carried on board at all timnes. Select the parts for your engine
on page 43 and purchase spares from your local Westerbeke Dealer
or Distributor. For example, hardware kit *34441 will supply fuel
system washers for the Model 46.
If a leak should develop at a banjo or washer that cannot be
remedied by a simple tightening of the screw, renew the washers.
The engine can be started by taking steps described on pages 9
and 10. In cases where the engine cannot be started easily, loosen
two injection nuts on the nozzle side, turn the speed control
lever to "full open" position, turn the starter motor and then
tighten the nuts firmly.
4. Replacing filter elements
After the first 50 hours of operation, unscrew and discard fuel
filter element. Install a new filter.
This same treatment is required of the filter element in the fuel
lift pump. Similarly, replace with a new filter element using a
new
gasket.
After the first 50 hours change, the change period may be
increased at 200 hours or once per season.
5. Fuel injection pump
The fuel injection pump is one of the most important components of
the diesel engine and thus it calls for the utmost caution in
handling. Furthermore, the fuel injection pump has been
thoroughly shop-adjusted and should never be readjusted
carelessly.
Such adjustments, whenever necessary, should be performed at an
authorized service station, as a precision pump tester skill are
required.
To obtain long and satisfactory use of your injection pump:
Always use fuel which is free from impurities.
Clean and renew the fuel filters periodically.
Inspect water entrapment filter regularly.
16

On the forward control housing of the injection pump is a buffer
screw. This buffer screw has all the visual characteristeics of a
bleed screw, but it is not. The adjustment of this screw should
not be tampered with, or disturbed.
Disturbing the adjustment of this buffer screw can shut off the
delivery of fuel from the injection pump to the injectors and pre-
vent the engine from starting.
DO NOT TAMPER WITH THIS BUFFER SCREW ADJUSTMENT!
INJECTOR PUMP
BUFFER SCREW
17

COOLING SYSTEM
1. Cooling water
As cooling water, use soft water with least impurity content such
as tap water (potable water) or rainwater, and never use hard
water or foul water. Use of hard water or water containing much
impurity will lead to collection of scale in the engine and heat
exchanger with resultant decline in cooling effects.
2. Antifreeze
In cold districts, care should be taken to prevent cooling water
from freezing. Cooling water, when frozen, expands to break the
heat exchanger and the cylinder block, and it is essential that
antifreeze be added to cooling water in a quantity proportional to
the lowest temperature of the district. It is recommended that
the antifreeze mixture be used throughout the year.
*Antifreeze of poor
will cause corrosion
antifreeze prepared by
quality or without rust inhibitor
of the cooling system. Always use
a reliable maker.
*Make sure that the cooling system of the engine is cleaned
well before adding antifreeze.
*Recommended antifreeze for year round use is ZEREX or
PRESTONE with rust inhibitor.
*Thoroughly mix the antifreeze and water before adding to the
cooling system.
ANTIFREEZE ADDITION DATA
Antifreeze
Concentration %
13 23 30 35 45 50
60
Freezing
temperature
·C
( • F)
-5
(23 )
-10
(14)
-15
(5)
-20
(-4)
-30
(-22)
-40
(-40 )
-50
(-58 )
Note:
It is advisable that
selected on the basis of
5·C (lO·F) lower than
perature expected.
3. Fresh water cooling system
antifreeze concentration be
a temperature which is about
the actual atmospheric tem-
The system consists of a sea water pump which pumps raw sea water
through a heat exchanger to remove heat from the coolant. The raw
water is discharged overboard through the exhaust line.
The engine coolant (fresh water with or without antifreeze) is
circulated by the fresh water pump in continuous circuit, pumped
through the cylinder block, cylinder head, heat exchanger and back
to the fresh water pump.
18