Kohler RH255 Manual de usuario

18 690 06 Rev. -- KohlerEngines.com

RH255, RH265

Service Manual

2 Safety

3 Maintenance

5 Speciﬁcations

12 Tools and Aids

15 Troubleshooting

19 Air Cleaner/Intake

20 Fuel System

24 Governor System

25 Lubrication System

26 Electrical System

32 Starter System

36 Disassembly/Inspection and Service

45 Reassembly

IMPORTANT: Read all safety precautions and instructions carefully before operating equipment. Refer to operating

instruction of equipment that this engine powers.

Ensure engine is stopped and level before performing any maintenance or service.

Safety

KohlerEngines.com 18 690 06 Rev. --

SAFETY PRECAUTIONS

WARNING: A hazard that could result in death, serious injury, or substantial property damage.

CAUTION: A hazard that could result in minor personal injury or property damage.

NOTE: is used to notify people of important installation, operation, or maintenance information.

WARNING

Explosive Fuel can cause

ﬁres and severe burns.

Do not ﬁll fuel tank while

engine is hot or running.

Gasoline is extremely ﬂammable

and its vapors can explode if

ignited. Store gasoline only in

approved containers, in well

ventilated, unoccupied buildings,

away from sparks or ﬂames.

Spilled fuel could ignite if it comes

in contact with hot parts or sparks

from ignition. Never use gasoline

as a cleaning agent.

WARNING

Rotating Parts can cause

severe injury.

Stay away while engine

is in operation.

Keep hands, feet, hair, and

clothing away from all moving

parts to prevent injury. Never

operate engine with covers,

shrouds, or guards removed.

WARNING

Carbon Monoxide can

cause severe nausea,

fainting or death.

Avoid inhaling exhaust

fumes.

Engine exhaust gases contain

poisonous carbon monoxide.

Carbon monoxide is odorless,

colorless, and can cause death if

inhaled.

WARNING

Accidental Starts can

cause severe injury or

death.

Disconnect and ground

spark plug lead(s) before

servicing.

Before working on engine or

equipment, disable engine as

follows: 1) Disconnect spark plug

lead(s). 2) Disconnect negative (–)

battery cable from battery.

WARNING

Hot Parts can cause

severe burns.

Do not touch engine

while operating or just

after stopping.

Never operate engine with heat

shields or guards removed.

WARNING

Cleaning Solvents can

cause severe injury or

death.

Use only in well

ventilated areas away

from ignition sources.

Carburetor cleaners and solvents

are extremely ﬂammable. Follow

cleaner manufacturer’s warnings

and instructions on its proper and

safe use. Never use gasoline as a

cleaning agent.

CAUTION

Electrical Shock can

cause injury.

Do not touch wires while

engine is running.

CAUTION

Damaging Crankshaft

and Flywheel can cause

personal injury.

Using improper procedures can

lead to broken fragments. Broken

fragments could be thrown from

engine. Always observe and use

precautions and procedures when

installing ﬂywheel.

WARNING

Uncoiling Spring can

cause severe injury.

Wear safety goggles or

face protection when

servicing retractable

starter.

Retractable starters contain a

powerful, recoil spring that is

under tension. Always wear safety

goggles when servicing retractable

starters and carefully follow

instructions in Retractable Starter

for relieving spring tension.

Maintenance

18 690 06 Rev. -- KohlerEngines.com

MAINTENANCE INSTRUCTIONS

WARNING

Before working on engine or equipment, disable engine as

follows: 1) Disconnect spark plug lead(s). 2) Disconnect

negative (–) battery cable from battery.

Accidental Starts can cause severe injury or

death.

Disconnect and ground spark plug lead(s)

before servicing.

Normal maintenance, replacement or repair of emission control devices and systems may be performed by any repair

establishment or individual; however, warranty repairs must be performed by a Kohler authorized dealer.

MAINTENANCE SCHEDULE

After ﬁrst 5 Hours

●Change oil. Lubrication System

Every 100 Hours or Annually¹

●Clean/replace foam element. Air Cleaner/Intake

●Replace paper element. Air Cleaner/Intake

●Change oil. Lubrication System

●Clean cooling areas. Air Cleaner/Intake

●Clean spark arrestor (if equipped).

●Replace fuel ﬁlter (if equipped).

1Perform these procedures more frequently under severe, dusty, dirty conditions.

REPAIRS/SERVICE PARTS

Kohler genuine service parts can be purchased from Kohler authorized dealers. To ﬁnd a local Kohler authorized

dealer visit KohlerEngines.com or call 1-800-544-2444 (U.S. and Canada).

Maintenance

KohlerEngines.com 18 690 06 Rev. --

OIL RECOMMENDATIONS

We recommend use of Kohler oils for best performance.

Other high-quality detergent oils (including synthetic)

of API (American Petroleum Institute) service class SJ

or higher are acceptable. Select viscosity based on

air temperature at time of operation as shown in table

below.

FUEL RECOMMENDATIONS

WARNING

Explosive Fuel can cause ﬁres and severe

burns.

Do not ﬁll fuel tank while engine is hot or

running.

Gasoline is extremely ﬂammable and its vapors can

explode if ignited. Store gasoline only in approved

containers, in well ventilated, unoccupied buildings,

away from sparks or ﬂames. Spilled fuel could ignite

if it comes in contact with hot parts or sparks from

ignition. Never use gasoline as a cleaning agent.

NOTE: E15, E20 and E85 are NOT approved and

should NOT be used; effects of old, stale or

contaminated fuel are not warrantable.

Fuel must meet these requirements:

●Clean, fresh, unleaded gasoline.

●Octane rating of 87 (R+M)/2 or higher.

●Research Octane Number (RON) 90 octane minimum.

●Gasoline up to 10% ethyl alcohol, 90% unleaded is

acceptable.

●Methyl Tertiary Butyl Ether (MTBE) and unleaded

gasoline blend (max 15% MTBE by volume) are

approved.

●Do not add oil to gasoline.

●Do not overﬁll fuel tank.

●Do not use gasoline older than 30 days.

STORAGE

If engine will be out of service for 2 months or more

follow procedure below.

1. Add Kohler PRO Series fuel treatment or equivalent

to fuel tank. Run engine 2-3 minutes to get stabilized

fuel into fuel system (failures due to untreated fuel

are not warrantable).

2. Change oil while engine is still warm from operation.

Remove spark plug(s) and pour about 1 oz. of

engine oil into cylinder(s). Replace spark plug(s) and

crank engine slowly to distribute oil.

3. Disconnect negative (-) battery cable.

4. Store engine in a clean, dry place.

Speciﬁcations

18 690 06 Rev. -- KohlerEngines.com

Engine Dimensions

Dimensions in millimeters. Inch equivalents shown in [ ].

329.53

[12.974]

FUEL CAP

REMOVAL

10.50

[0.413]

65.05

[2.561]

32.53

[1.281]

162.00

[6.378]

32.53

[1.281]

65.05

[2.561]

66.00

[2.598]

METRIC FLANGE: 4X M8 X 1.25-6H 15.00 [0.591]

SAE FLANGE: 4X

5/16-24 UNF-2B 15.00 [0.591]

297.37

[11.707]

106.00

[4.173]

5.00

[0.197]

15.24

[0.600]

40.00

[1.575]

35.71

[1.406]

80.50

[3.169]

1.16

[0.046]

3.89

[0.153]

61.24

[2.411]

MOUNTING FACE

Ø 19.0 [0.75]

4.74

[0.187]

2X Ø 10.00 [0.394]

2X Ø 10.00 [0.394] X 15.00 [0.590] SLOT

CYLINDERC

Ø 19.0 [0.75]

5/16-24 UNF-2B 24.5

3/4” STRAIGHT SHAFT

SAE

242.84

[9.561]

249.68

[9.830]

310.92

[12.241]

248.54

[9.785]

61.24

[2.411]

355.66

[14.002]

109.37

[4.306]

AIR CLEANER COVER

OPENING SWING DIRECTION

MOUNTING FACE

Speciﬁcations

KohlerEngines.com 18 690 06 Rev. --

ENGINE IDENTIFICATION NUMBERS

Kohler engine identiﬁcation numbers (model, speciﬁcation and serial) should be referenced for efﬁcient repair,

ordering correct parts, and engine replacement.

Model. . . . . . . . . . . . . . . . . . . . . RH265

2000 Series Engine

Numerical Designation

Speciﬁcation . . . . . . . . . . . . . . . RH265-0001

Serial . . . . . . . . . . . . . . . . . . . . . 4323500328

Year Manufactured Code Factory Code

Code Year

43 2013

44 2014

45 2014

GENERAL SPECIFICATIONS3,6 RH255, RH265

Bore 68 mm (2.7 in.)

Stroke 54 mm (2.1 in.)

Displacement 196 cc (12.0 cu. in.)

Oil Capacity (reﬁll) 0.6 L (0.63 U.S. qt.)

Maximum Angle of Operation (@ full oil level)425°

TORQUE SPECIFICATIONS3,5 RH255, RH265

Air Cleaner Base/Carburetor

Mounting Nut 8 N·m (70.8 in. lb.)

Stud 10 N·m (88.5 in. lb.)

Blower Housing/Retractable Starter Assembly and Sheet Metal

M6 Screw 8 N·m (70.8 in. lb.)

M6 Nut 8 N·m (70.8 in. lb.)

Connecting Rod

Cap Fastener (torque in increments) 12 N·m (106 in. lb.)

Crankcase

Oil Drain Plug 18 N·m (13 ft. lb.)

Closure Plate Screw 24 N·m (212 in. lb.)

Cylinder Head

Fastener (torque in 2 increments) ﬁrst to 12 N·m (106 in. lb.)

ﬁnally to 24 N·m (212 in. lb.)

Flywheel

Retaining Nut 74 N·m (655 in. lb.)

3 Values are in Metric units. Values in parentheses are English equivalents.

4Exceeding maximum angle of operation may cause engine damage from insufﬁcient lubrication.

5Lubricate threads with engine oil prior to assembly.

6Any and all horsepower (hp) references by Kohler are Certiﬁed Power Ratings and per SAE J1940 & J1995 hp

standards. Details on Certiﬁed Power Ratings can be found at KohlerEngines.com.

Speciﬁcations

18 690 06 Rev. -- KohlerEngines.com

TORQUE SPECIFICATIONS3,5 RH255, RH265

Fuel Tank

Mounting Screw 4.5 N·m (40 in. lb.)

Outlet Filter Fitting 2.0 N·m (17.7 in. lb.)

Governor

Arm Nut 7 N·m (62 in. lb.)

Throttle Control Lever Nut 4.5-6 N·m (40-53 in. lb.)

Ignition

Spark Plug 27 N·m (20 ft. lb.)

Module Fastener 8 N·m (70.8 in. lb.)

Mufﬂer

M6 Exhaust Screw 9.5 N·m (84 in. lb.)

Rocker Arm

Stud 24 N·m (212 in. lb.)

Pivot Jam Nut 10 N·m (88.5 in. lb.)

Valve Cover

Fastener 8 N·m (70.8 in. lb.)

CLEARANCE SPECIFICATIONS3RH255, RH265

Camshaft

End Play 0.025/0.602 mm (0.0010/0.0237 in.)

Running Clearance 0.016/0.052 mm (0.0006/0.0020 in.)

Bore I.D.

New

Max. Wear Limit

14.000/14.018 mm (0.5512/0.5519 in.)

14.048 mm (0.5531 in.)

Connecting Rod

Crankpin End I.D. @ 21°C (70°F)

New

Max. Wear Limit

30.021/30.026 mm (1.1819/1.1821 in.)

30.08 mm (1.184 in.)

Connecting Rod-to-Crankpin Running Clearance

New

Max. Wear Limit

0.041/0.051 mm (0.002/0.002 in.)

0.12 mm (0.005 in.)

Connecting Rod-to-Crankpin Side Clearance

New

Max. Wear Limit

0.58/0.60 mm (0.023/0.024 in.)

1.10 mm (0.043 in.)

Connecting Rod-to-Piston Pin Running Clearance 0.01/0.027 mm (0.0004/0.0011 in.)

Piston Pin End I.D. @ 21°C (70°F)

New

Max. Wear Limit

18.010/18.015 mm (0.709/0.709 in.)

18.08 mm (0.712 in.)

3 Values are in Metric units. Values in parentheses are English equivalents.

5Lubricate threads with engine oil prior to assembly.

Speciﬁcations

KohlerEngines.com 18 690 06 Rev. --

CLEARANCE SPECIFICATIONS3RH255, RH265

Crankcase

Governor Cross Shaft Bore I.D.

New

Max. Wear Limit

6.000/6.018 mm (0.2362/0.2369 in.)

6.037 mm (0.2377 in.)

Crankshaft

End Play (free) 0.025/0.703 mm (0.0010/0.028 in.)

Bore (in crankcase)

New 51.961/51.991 mm (2.0457/2.0469 in.)

Bore (in closure plate)

New 51.961/51.991 mm (2.0457/2.0469 in.)

Flywheel End Main Bearing Journal O.D.

O.D.-New

O.D.-Max. Wear Limit

Max. Taper

Max. Out-of-Round

24.975/24.989 mm (0.9833/0.9838 in.)

24.95 mm (0.9823 in.)

0.025 mm (0.0010 in.)

Closure Plate End Main Bearing Journal O.D.

O.D.-New

O.D.-Max. Wear Limit

Max. Taper

Max. Out-of-Round

24.975/24.989 mm (0.9833/0.9838 in.)

24.95 mm (0.9823 in.)

0.025 mm (0.0010 in.)

Connecting Rod Journal O.D.

O.D.-New

O.D.-Max. Wear Limit

Max. Taper

Max. Out-of-Round

Width

29.975/29.985 mm (1.1801/1.1805 in.)

29.920 mm (1.1779 in.)

0.025 mm (0.0010 in.)

25.02/25.08 mm (0.9850/0.9874 in.)

Runout (either end) 0.025 mm (0.0010 in.)

Cylinder Bore

Bore I.D.

New

Max. Wear Limit

Max. Out-of-Round

Max. Taper

68.015/68.030 mm (2.677/2.678 in.)

68.195 mm (2.685 in.)

12.7 microns (0.0005 in.)

Cylinder Head

Max. Out-of-Flatness 0.1 mm (0.0039 in.)

Governor

Governor Cross Shaft-to-Crankcase Running Clearance 0.013/0.075 mm (0.0005/0.0029 in.)

Governor Cross Shaft O.D.

New

Max. Wear Limit

5.95/5.98 mm (0.2342/0.2354 in.)

5.85 mm (0.2303 in.)

Governor Gear Shaft-to-Governor Gear Running Clearance 0.09/0.19 mm (0.0035/0.0074 in.)

Governor Gear Shaft O.D.

New

Max. Wear Limit

6.028/6.043 mm (0.2373/0.2379 in.)

6.018 mm (0.2369 in.)

3 Values are in Metric units. Values in parentheses are English equivalents.

5Lubricate threads with engine oil prior to assembly.

Speciﬁcations

18 690 06 Rev. -- KohlerEngines.com

CLEARANCE SPECIFICATIONS3RH255, RH265

Ignition

Spark Plug Gap 0.76 mm (0.030 in.)

Module Air Gap 0.254 mm (0.0100 in.)

Piston, Piston Rings, and Piston Pin

Piston-to-Piston Pin Running Clearance 0.006/0.018 mm (0.0002/0.0007 in.)

Piston Pin Bore I.D.

New

Max. Wear Limit

18.002/18.008 mm (0.7087/0.7090 in.)

18.05 mm (0.7107 in.)

Piston Pin O.D.

New

Max. Wear Limit

17.990/17.996 mm (0.7083/0.7085 in.)

17.95 mm (0.7067 in.)

Top Compression Ring Side Clearance

New Bore

Used Bore (max.)

0.030/0.070 mm (0.0012/0.0028 in.)

0.15 mm (0.0059 in.)

Center Compression Ring Side Clearance

New Bore

Used Bore (max.)

0.020/0.060 mm (0.0008/0.0024 in.)

0.15 mm (0.0059 in.)

Top Compression Ring End Gap

New Bore

Used Bore (max.)

0.147/0.344 mm (0.0058/0.0136 in.)

1.00 mm (0.0394 in.)

Center Compression Ring End Gap

New Bore

Used Bore (max.)

0.347/0.594 mm (0.0137/0.0234 in.)

1.50 mm (0.0591 in.)

Top and Center Compression Ring Width

New Bore

Used Bore (max.)

1.47/1.49 mm (0.0579/0.0587 in.)

1.35 mm (0.0531 in.)

Oil Control Ring-to-Groove Side Clearance 0.040/0.200 mm (0.0016/0.0079 in.)

Piston Thrust Face O.D.7

New

Max. Wear Limit

67.965/67.985 mm (2.6758/2.6766 in.)

67.85 mm (2.6713 in.)

Piston Thrust Face-to-Cylinder Bore Running Clearance

New 0.030/0.065 mm (0.0012/0.0026 in.)

3 Values are in Metric units. Values in parentheses are English equivalents.

7 Measure 15 mm (0.5905 in.) above bottom of piston skirt at right angles to piston pin.

Speciﬁcations

KohlerEngines.com 18 690 06 Rev. --

CLEARANCE SPECIFICATIONS3RH255, RH265

Valves and Valve Lifters

Intake Valve Stem-to-Valve Guide Running Clearance 0.020/0.044 mm (0.008/0.0017 in.)

Exhaust Valve Stem-to-Valve Guide Running Clearance 0.030/0.054 mm (0.0011/0.0021 in.)

Intake Valve Stem O.D.

New

Max. Wear Limit

5.480 mm (0.2157 in.)

5.32 mm (0.2094 in.)

Exhaust Valve Stem O.D.

New

Max. Wear Limit

5.47 mm (0.2153 in.)

5.305 mm (0.2088 in.)

Intake Valve Stem to Guide

New

Max. Wear Limit

0.024/0.039 mm (0.001/0.002 in.)

0.10 mm (0.0004 in.)

Exhaust Valve Stem to Guide

New

Max. Wear Limit

0.098/0.112 mm (0.0038/0.0044 in.)

0.12 mm (0.0005 in.)

Valve Guide Reamer Size

Standard Intake

Standard Exhaust

5.506 mm (0.2168 in.)

Valve Seat Width 0.800/2.00 mm (0.0315/0.787 in.)

Nominal Valve Face Angle 30°, 45°, 60°

3 Values are in Metric units. Values in parentheses are English equivalents.

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