LEHR LP 5.0S User manual

LP5.0 S/L Service Manual
Propane Outboard Engine
Technical Specifications and Step by Step Guides
Phone : [phone]
Fax : [phone]
Email : [e-mail]
Your LEHR Authorized Dealer and Service Provider
Call Toll Free: 1-877-666-8679

LEHR LP2.5 HP Rev.A 2013
1
Service Manual Table of Contents
1 GeneralInformationandSpecications
2Fuel Systems
3Ignition
4Powerhead
5Gearcase
6Miscellaneous
7Parts Book Reference
8Operators Manual Reference
1
2
3
4
5
6
7
8

LEHR LP5.0 HP Rev.A 2014
2
Understanding Propane
GeneralSpecications
EngineProleLineDrawing
MaintenanceSpecications
Maintenance Schedule
EngineFastenerTorqueSpecications
General Torque Values
Quick Notes
Fuel Consumption Chart
Special Tools
Adjusting Engine Idle Speed
Checking the Spark Plug
Changing the Engine Oil
Changing the Gearcase Oil
Lubrication Points
Valve Lash
Notes
16
18
19
20
21
22
24
17
1
General Information and Specications
4
3
7
10
11
12
13
15
6

LEHR LP5.0 HP Rev.A 2014
3
* Green Key- is a trademark of the Coleman company
WARNING:
PROPANE IS HIGHLY FLAMMABLE, AND ITS
VAPORS CAN EXPLODE IF IGNITED.
SAFETY WARNINGS FOR PROPANE UNITS
CARBON MONOXIDE HAZARD
Burning propane makes Carbon Monoxide (CO). CO is
invisible, has no smell and can kill you. Operating your
outboard engine in an enclosed area can be dangerous.
1. Use only in well ventilated areas. If you experience
headache, drowsiness, or nausea, turn unit o and
get fresh air quickly.
2. Never use where people are sleeping.
3. Follow unit instructions for proper use.
HANDLING & STORAGE
1. Keep out of reach of children.
2. Never expose cylinder to heat, sparks, or ame.
Never store in direct sunlight.
Never store at temperatures above 120 degrees F°
(49°C).
3. Never store in living spaces.
4. Always use cylinder until it is completely empty.
5. Never rell a disposable cylinder. Relling may cause
an explosion. Federal law forbids transportation if
relled, a penalty up to $500,000, and 5 years
imprisonment (49 U.S.C. 5124).
6. Never store in luggage or take on trains or aircraft.
7. To discard, contact local refuse hauler or recycle center.
Never put in re or incinerator. Do not puncture.
If your cylinder was purchased with a “Green Key” * or
similar device, install it when empty and cylinder may
be recycled with other steel items.
NOTE: FIRE/EXPLOSION HAZARD
Contains enough gas to cause serious re, explosion,
and burns. To reduce chance of leak, re, or explosion,
take the following precautions:
BEFORE USE
1. Check cylinder and appliance seals. Never use with
damaged or missing seals. Discard cylinder if dirt or
rust particles are in valve area.
2. Turn engine o.
3. Attach cylinder outdoors away from pilot lights, ames,
sparks or other ignition sources. These sources can
ignite leaking gas.
4. Hand tighten only. Never use tools to tighten.
Over tightening can damage seals.
5. Check for leaks. Put soapy water on connections.
Look for bubbles. Listen for hiss of escaping gas. Feel
for extreme cold. Smell for rotten egg odor. Do not
use if leaking.
6. Read and follow operation instructions.
DURING USE
Never use near pilot lights, ames, sparks, or other
ignition sources. They can ignite leaking gas.
AFTER USE
1. Turn engine o and let cool.
2. Detach cylinder when not in use.
3. Detach outdoors away from pilot lights, ames, sparks,
or other ignition sources, they can ignite leaking gas.
4. Replace cap to keep valve clean.
IN CASE OF FIRE
1. Leave area quickly and call for help.
2. Let the cylinder burn out.
UNDERSTANDING PROPANE
NOTE: Use propane only in containers and/or remote
larger tanks specically designed and approved for this
unit. Propane is a combustible gas, it is colorless and
thus invisible to the naked eye. Propane has a harmless
odorant added so that it is possible to smell it. The user
should be familiar with the smell of propane (smells like
sulfur or rotten eggs). If at any time the smell of propane
is identied, turn o the engine. If the leak persists,
remove the pro-pane canister. Never attempt to operate
a unit that has a suspected leak. Always remove the
propane canister from any unit that has a suspected leak.

LEHR LP5.0 HP Rev.A 2014
4
General Specications
Dimension
Overall length
Overall width
Overall height
Boat transom height
Weight
Performance
Maximum output
Full throttle operating range
Fuel consumption
At 5000 RPM
At 3000 RPM
Power Unit
Type
Cylinder quantity
Displacement
Bore x Stroke
Compression ratio
Control System
Starting System
Ignition control system
Ignition timing
Spark plug
Cooling system
Exhaust system
Lubrication System
717 mm (28.2 in)
361 mm (14.2 in)
1,029 mm (40.5 in) / 1156 mm (45.5 in)
381mm (15.0 in) / 1508 mm (20 in)
22.5 kg (49.6 lbs) / 23.9 kg (52.8 lbs)
3.6 kW (5.0 hp) at 5,000 r/min
4,500 - 5,500 r/min
(0.5 gal/hr)
(0.22 gal/hr)
4-Stroke, single cylinder, OHV
1
112 cu. cm (6.8 cu. in)
59 mm X 41 mm (2.32 in X 1.61 in)
8.7 : 1
Tiller control
Manual starter
Ignition Coil
MaxAdvance30DegreesBTDC
BR6HS (NGK)
Water
Under water
Splash
Item Model LP 5.0 S / L 1

LEHR LP5.0 HP Rev.A 2014
5
General Specications
Fuel and oil
Fuel type
Fuel rating
Engine oil type
Engine oil grade
Engine oil quantity
Gear oil type
Gear oil grade
Gear quantity
Bracket
Trim angle
(at 12 degree boat transom)
Tilt-up angle
Steering angle
Shallow Water Cruise Angles
Drive unit
Gear shift positions
Gear ratio
Reduction gear type
Clutch type
Propeller shaft type
Propeller direction (rear view)
PropellerDiameterXPitch
Propane
110 Octane
4-stroke motor oil 10W-30
SE, SF, SG, SH, or SJ (API)
0.5 L (0.53 US Quarts) (17 oz.)
Gear Case Lube
90
100 ml (3.4 oz)
4, 8, 12, 16, 20 degrees
76 degrees
360 degrees
30, 42, 54 degrees
F - N - R
2.08 (27/13)
Straight bevel gear
Dogclutch
Spline
Clockwise
7 1/2” X 7
1
Item Model LP 5.0 S / L

LEHR LP5.0 HP Rev.A 2014
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1
F
H
P
G
K
A
D
B
C
J
I
E
LEHR INC.
PROPANE POWERED OUTBOARD MARINE ENGINE
MODELS: LP5.0S & LP5.0L
in. mm
A 14.50 368
B (S) 22.50 572
B (L) 27.50 699
C (S) 17.50 445
C (L) 22.50 572
D 19.50 495
E 4.25 108
F 12.00 305
G 14.00 356
H 14.00 356
I 2.25 57
J 9.75 248
K 23.50 597
L 13.25 337
M 12.50 318
N 10.50 267
O 13.25 337
P 68 68
O
O
O
M
N
L

LEHR LP5.0 HP Rev.A 2014
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Maintenance Specications : Power Unit
Power unit
Minimum compression pressure*
Cylinder head
Warpage limit
Cylinder
Bore size
Taper limit
Out-of-round limit
Piston
Pistondiameter(D)
Measured at bottom of skirt,
90°to pin hole
Piston-to-cylinder clearance
Piston pin boss bore
Piston pin
Outside diameter
Piston rings
Top ring
Thickness
Width
End gap
Side clearance
2nd ring
Thickness
Width
End gap
Side clearance
660 kPa (6.6 kgf/cm², 94 psi)
0.1 mm (0.004 in)
59.00 - 59.02 mm (2.323 - 2.324 in)
0.08 mm (0.0031 in)
0.05 (0.0020 in)
58.950 - 58.965 mm (2.3209 - 2.3215 in)
0.035-0.065 mm (0.0014 - 0.0026 in)
13.009 - 13.017 mm (0.5122 - 0.5125 in)
12.995 - 13.000 mm (0.5116 - 0.5118 in)
1.5 mm (0.0382-0.0390 in)
2.6 mm (0.0768-0.0846 in)
0.10 - 0.20 mm (0.0059-0.0118 in)
0.04 - 0.08 mm (0.0016-0.0031 in)
1.5 mm (0.0461-0.0468 in)
2.6 mm (0.0906-0.0984 in)
0.25 - 0.40 mm (0.0118-0.0177 in)
0.02 - 0.06 mm (0.0008-0.0024 in)
Item Model LP 5.0 S / L
* Measuring conditions:
Ambient temperature 20°C (68°F), wide open throttle, with spark plug removed
formcylinder.Theguresareforreferenceonly.
1

LEHR LP5.0 HP Rev.A 2014
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Oil ring
Thickness
Width
End gap
Side clearance
Camshaft
Base diameter and lobe height
Intake
Exhaust
Base diameter
Camshaft journal diameter
Camshaft runout limit
Valves
Valve clearance (cold)
Intake
Exhaust
Head diameter
Intake
Exhaust
Face width
Intake and exhaust
Seat contact width
Intake and exhaust
Stem diameter
Intake
Exhaust
Guide inside diameter
Intake and exhaust
Stem-to-guide clearance
Intake
Exhaust
Stem runout limit
Valve springs
Free length
Tilt limit
1.87 - 1.95 mm (0.0736-0.0768 in)
2.4 mm (0.0945 in)
2.5 mm (0.0024 in)
0.2 - 0.7 mm (0.0008-0.0024 in)
26.736 - 26.836 mm (1.0526-1.0565 in)
26.532 - 26.623 mm (1.0442-1.0481 in)
21.950 - 22.050 mm (0.8642-0.8681 in)
14.934 - 14.984 mm (0.5880-0.5899 in)
0.03 mm (0.0012 in)
0.08 - 0.12 mm (0.003 - 0.005 in)
0.08 - 0.12 mm (0.003 - 0.005 in)
23.9 - 24.1 mm (0.941-0.949 in)
21.9 - 22.1 mm (0.862-0.870 in)
1.84 - 2.26 mm (0.0724-0.0890 in)
0.6 - 0.8 mm (0.024-0.031 in)
5.475 - 5.490 mm (0.2156-0.2161 in)
5.460 - 5.475 mm (0.2150-0.2156 in)
5.500 - 5.512 mm (0.2165-0.2170 in)
0.010 - 0.037 mm (0.0004-0.0015 in)
0.025 - 0.052 mm (0.0010-0.0020 in)
0.03 mm (0.0012 in)
35 mm (1.378 in)
1.2 mm (0.05 in)
1
Item Model LP 5.0 S / L

LEHR LP5.0 HP Rev.A 2014
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Connecting rod
Small end inside diameter
Big end inside diameter
Big end side clearance
Crankpin oil clearance
Crankshaft
Crankshaft journal diameter
Crankpin diameter
Crankpin width
Runout limit
Thermostat
Opening temperature
Fully open temperature
Valve open lower limit
Carburetor
ID mark
Main jet
Engine speed
Engine idle speed (In Neutral)
13.006-13.020 mm (0.5120-0.5126 in)
24.000-24.015 mm (0.9449-0.9455 in)
0.2-0.6 (0.008-0.024 in)
0.016-0.046 mm (0.0006-0.0018 in)
21.980-21.993 mm (0.8654-0.8659 in)
25.95 mm (0.1.022 in)
21.0-21.1 mm (0.827-0831 in)
0.03 mm (0.0012 in)
58-62 °C (136-144 °F)
70 °C (158 °F)
3 mm (0.12 in)
Ink Stamp
Fixed
1950 ± 150 r/min
Ignition system
Ignition timing
Ignition spark gap
Spark plug cap resistance
Ignition Coil unit air gap
Ignition Coil unit resistance
Primary coil (W – B)
Secondary coil
(W – spark plug wire)
BTDC28-32atmaxadvance(2500 RPM)
0.5 ~ 0.6mm (0.020-0.024 in)
4.0-6.0kΩ
0.4-0.6 mm (0.016-0.024 in)
0.56-0.84 Ω
11.6-17.4kΩ
Electrical Specications
1
Item Model LP 5.0 S / L

LEHR LP5.0 HP Rev.A 2014
10
LEHR | ALL RIGHTS RESERVED 2012-2013 15
MAINTENANCE
Initial Every
ItemActions10 hours 50 hours 100hours 200hours
(1 month) (3 months) ( 6 months) ( 1 year)
Anodes(s) Inspection/replacement
Coolingwater passages Cleaning
Cover clamps Inspection
Fuel systemInspection
Gear oil Change
Greasing pointsGreasing
IdlingspeedInspection /adjustment
Propellerandcotter pin Inspection/replacement
Shift link Inspection/adjustment
ThermostatInspection/replacement
Throttlelink/throttle
cable/throttleInspection/adjustment
Water pump Cleaning/adjustment/replacement
Engine oil Inspection/change
Spark plug(s) Inspection/adjustment/replacement
Valve clearance Inspection/adjustment
LUBRICATION
1. Remove the spark plug and spray some fogging oil into the cylinder.
2. Grease the spark plug threads and install the spark plug and torque to proper specification.
3. Change the gear oil. Inspect the oil for the presence of water that indicates a leaky seal.
4. Grease all grease fittings.
CLEANING THE OUTBOARD MOTOR AFTER USE
1. After use wash the exterior of the outboard motor with fresh water.
2. Flush the cooling system with fresh water.
CHECKING PAINTED SURFACE OF MOTOR
1. Check the motor for scratches, nicks, or flaking paint. Areas with damaged paint are more likely to
corrode. If necessary, clean and paint the areas.
NOTE: Be sure toturn off the engine when you perform maintenance unless otherwise specified. If you or
the owner are not familiar with machine servicing, this work should be done by your LEHR dealer
or other qualified mechanic.
REPLACEMENT PARTS
If replacement parts are necessary, use only genuine LEHR parts or parts of the same type and of
equivalent strength and materials. Any part of inferior quality may malfunction, and the resulting loss of
control could endanger the operator and passengers. LEHR genuine parts and accessories are available
from your LEHR dealer, or directly from LEHR.
MAINTENANCE CHART
Frequency of maintenance operations may be adjusted according tothe operating conditions, but the
following table gives general guidelines. Refer tothe sections in this chapter for explanations of each
owner-specificaction. When operating in salt water or dirty water, the engine should be flushed with clean
water after each use.
The “ ”symbol indicates the check-ups which you may carry out yourself.
The “ ”symbol indicates work to be carried out by your LEHR dealer.
•
1
Maintenance Schedule

LEHR LP5.0 HP Rev.A 2014
11
Engine Fastener Torque Specications
Power Unit
Connecting rod cap Step 1
Step 2
Crankcase bolt Step 1
Step 2
Cylinder head bolt Step 1
Step 2
Step 1
Step 2
Cylinder head cover bolt Step 1
Step 2
Anode screw
Driveshaftoilsealhousingbolt
Exhaust probe bolt
Flywheel magnet nut
Rocker arm locknut
Rocker arm stud bolt
Engine oil drain bolt
Power unit bolt
Spark plug
Oil splasher gear bolt
Thermostat cover bolt
Intake Manifold
Drive Unit
Gear oil screw
Anode
Shift rod arm bolt
Shift rod connecting bolt
Bracket Unit
Bottom cowling bolt
Bottom cowling screw
Tiller handle bolt
Carrying handle screw
Engine shut-off switch nut
Grease nipple
Swivel bracket bolt
Throttle grip screw
Clamp bracket inner nut
Clamp bracket outer nut
M7
M7
M8
M8
M8
M8
M6
M6
M6
M6
M5
M8
M8
—
M6
M6
M8
M6
—
M6
M6
M6
—
M6
M5
M6
M6
M5
M8
M6
—
—
M6
M5
—
—
Item Thread Size Tightening Torques
N•m
9.0
12
10
22
14
30
6
11
5.0
12
2.0
18
20
44
10
10
18
11
25
13
8.0
8.0
8.5
8.0
5.0
10
8.0
2.0
18
8.0
1.8
3.0
12
3.5
5.0
16
kgf•m
0.9
1.2
1.0
2.2
0.6
1.1
1.4
3.0
0.5
1.2
0.2
1.8
2.0
4.4
1.0
1.0
1.8
1.1
2.5
1.3
0.8
0.8
0.9
0.8
0.5
1.0
0.8
0.2
1.8
0.8
0.2
0.3
1.2
0.4
0.5
1.6
ft•lb
6.6
8.7
7.2
16
10.3
22.1
4.3
8.0
3.7
8.9
1.5
13
14.8
32.4
7.4
7.4
13.3
8.1
18.4
9.6
5.9
5.9
6.3
5.9
3.7
7.4
5.9
1.5
13
5.9
1.3
2.2
8.9
2.6
3.7
11.8
1

LEHR LP5.0 HP Rev.A 2014
12
8 mm
10 mm
12, 13 mm
M5
M6
M8
Bolt or Nut
Wrench Size
Bolt
Thread Size
Tightening Torques
N•m
5
8
18
kgf•m
0.5
0.8
1.8
ft•lb
3.6
5.8
13
General Torques
Thischartspeciestighteningtorquesforstandardfastenerswithastandard
ISO thread pitch.
Tighteningtorquespecicationsforspecialcomponentsorassembliesare
provided in applicable sections for this manual.
To avoid warpage, tighten multi-fastener assemblies in a crisscross fashion
andprogressivestagesuntilthespeciedtorqueisreached.
Unlessotherwisespecied,torquespecicationsrequireclean,drythreads.
Components should be at room temperature.
1

LEHR LP5.0 HP Rev.A 2014
13
1
Quick Notes
Commonly Referred to Specications
Carburetor Metering Needle Base Settings
measured from the at of the slide to the tip of the needle
14.5 mm (0.716 in)
TestTankMinimumRPMWOTSpecicationswithastandard
propeller with a maximum of 24.1cm or (9 ½”) water level as mea-
sured from the water surface to the top of the test tank transom
Minimum 3950 rpm
TestTankNeutralIdleRPMSpecicationswithastandardpro-
peller with a maximum of 9 ½” water level as measured from the
water surface to the top of the test tank transom
1950 ±150 rpm
Spark Plug and gap:
BR6HS @ 0.5 ~ 0.6 mm or (0.020 ~ 0.024 in)
Ignition Coil to Flywheel Air Gap
0.4 ~ 0.6 mm or (0.016 ~ 0.024 in)
Valve Lash…Performed with cold valves
Intake 0.08 - 0.12 mm (0.003 - 0.005 in)
Exhaust 0.08 - 0.12 mm (0.003 - 0.005 in)
Thermostat Temperatures…Starts to open at and fully open at:
58 ~ 62 °C (136 ~ 144 °F)……..70 °C (158 °F)
Ideal Operating RPM at WOT on Boat:
4500 ~ 5500 rpm
Test Tank Water Level: 9 ½ ~ 11 ½”
Measured from surface of water to top of test tank transom
Engine Oil Weight, Quantity, Oil Grade:
0.5L (16 oz) of 10W – 30…SAE or API SE, S, SG, SH, SJ, SL
Gearcase Gearlube:
0.075L (2.54 oz) of Hypoid SAE 90 weight

LEHR LP5.0 HP Rev.A 2014
14
1
Quick Notes
Commonly Referred to Specications
How to read engine Serial Number Code:
Example….LP5.0L 13C00031
LP5.0L 13 C 00031
Model Year Month Engine Number
ALehr Propane 5.0 HP Long Shaft
BYear built 2013
CMonth built March
(Month built uses alpha A thru L for Jan thru Dec)
D Lastvedigitsareproductionnumberor#31
ABCD

LEHR LP5.0 HP Rev.A 2014
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1

LEHR LP5.0 HP Rev.A 2014
16
Service Tools
A
B
D
H
I J K L M N
E
F
G
C
A DigitalMultimeter B Compression Pressure Gauge C Universal Puller
D Spark Tester E Inductive Tachometer F Calipers
G Paper Clip H Feeler Gauge
(Assorted Metric Hand Tools IJKLMN)
A basic assortment of shop equipment and hand tools are all that’s required to support basic maintenance activities.
1

LEHR LP5.0 HP Rev.A 2014
17
1
4. If a tachometer is not available, make your best judgment adjustment and
shift engine into gear.
Engine should not die. If it does, the idle rpm is too low. Increase the idle
rpm until it remains running in gear without dying.
5. If the idle rpm seems too high, slow the engine down with the idle speed
screw. After slowing the idle rpm down, check to make sure it doesn’t die
in gear. Adjust as necessary.
1. Placeengineinasuitablewaterlledtesttank.Waterlevelshouldbe
approximately 9 ½” from the top of the transom.
2. Hook up an inductive tachometer Bsuitable for a single cylinder, four
stroke engine. Start the engine and allow it to warm up to proper operat-
ing temperature, about 3 minutes.
3. Once engine temperature and RPM’s are stable, use a small screwdriver
to adjust the idle speed adjustment screw 1to attain: 1950 ± 150 RPM
Turning the screw clockwise will speed the engine up and turning counter-
clockwise will slow it down.
Make very small adjustments and allow 30 seconds for the engine to sta-
bilize before making another adjustment.
Adjusting Engine Idle Speed
Inductive Self-Powered Tachometer
Engine Idle Speed: 1950 ± 150 RPM in Neutral
E
B
1

LEHR LP5.0 HP Rev.A 2014
18
2. Inspect the spark electrodes for wear or combustion deposits.
Clean or replace if necessary.
3. Check the spark plug gap and adjust if necessary.
Gap to 0.5mm (0.020 in)
4. Installthesparkplugngertight,thentorgueto25.0N•mor(18.4ft•lbs)
5. Install the spark plug lead securely to the plug.
The boot should touch the hex of the plug when on all the way.
1. Remove the upper engine cover.
Remove the rubber spark plug boot .
Remove spark plug by using the spark plug wrench provided in the
toolkit,thehandleofthistoolisshapedspecicallytoaccessthe
spark plug. Most universal tools will not work.
Spark Plug: BR6HS (NGK)
Spark Plug Gap A:0.5-0.6 mm (0.020-0.024 in)
Spark Plug Torque: 25.0 N•m (18.4 ft•lbs)
S
Checking the Spark Plug
1
A

LEHR LP5.0 HP Rev.A 2014
19
3. Inspect the copper washer, replace if necessary.
Install the drain bolt 1,(13mmsocket)andthentightenittothespeciedtorque.
4.Add0.5L(0.53qts)ofengineoilintotheoilllerhole.
5.Installtheoilllercap,andthenstarttheengineandwarmitupfor5minutes
6. Turn the engine off, and then check the oil level and correct it if necessary.
Changing the Engine Oil
1.Removetheoilllercap
2. Place a drain pan under the drain hole, and then remove the drain bolt 1and
let the oil drain completely.
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Be sure to clean up any oil spills.
Engine oil drain bolt 1:18N•m(1.8kgf•m,13.3ft•lb)
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