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Kohler M18 Service Manual

Kohler M18
139 pages
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Table of Contents

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Kohler M18 Specifications

General IconGeneral
BrandKohler
ModelM18
CategoryEngine
LanguageEnglish

Summary

SECTION 1 SAFETY AND GENERAL INFORMATION

ENGINE IDENTIFICATION NUMBERS

Details regarding engine model and serial number identification.

OIL RECOMMENDATIONS

Guidance on engine oil type and viscosity grades.

OIL FILTER

Information on oil filter maintenance and replacement.

FUEL RECOMMENDATIONS

Specifications for fuel type and octane rating.

SPECIFICATIONS, TOLERANCES, AND SPECIAL TORQUE VALUES

Technical data including engine specs and torque settings.

STANDARD TORQUE VALUES

Tables detailing torque specifications for fasteners.

SECTION 2 SPECIAL TOOLS

VALVE SERVICE TOOLS

Tools for valve service, including pullers and installers.

SEAL AND BEARING INSTALLERS

Tools for installing seals and bearings.

OTHER APPLICATIONS

Tools for various other engine applications.

TOOL USAGE CHART

Chart detailing the usage of tools from Kit No. 3211.

ENGINE ANALYSIS KIT NO. KO-1000

Description and contents of the engine analysis kit.

IGNITION SYSTEM TESTER

Procedure for testing the engine ignition system.

RTV SILICONE SEALANT

Information on using RTV silicone sealant.

WATER MANOMETER

Use of a water manometer for checking engine vacuum.

CYLINDER LEAKDOWN TESTER

Tool for testing cylinder leaks and identifying issues.

SECTION 3 PERIODIC MAINTENANCE

REQUIRED MAINTENANCE

List of maintenance tasks and their required frequency.

CHANGE OIL

Instructions for changing engine oil and oil change intervals.

CHANGE OIL FILTER

Procedure for changing the engine oil filter.

PRECLEANER

Cleaning and maintenance of the pre-cleaner component.

PAPER ELEMENT

Instructions for cleaning or replacing the paper air filter element.

INSPECT AIR CLEANER COMPONENTS

Checklist for inspecting air cleaner parts.

CLEAN AIR INTAKE/COOLING AREAS

Procedure for cleaning air intake and cooling areas.

CHECK SPARK PLUGS

Procedure for checking and servicing spark plugs.

IGNITION SYSTEM SERVICE

Service information for the engine ignition system.

CHECK FUEL FILTER

Procedure for checking the inline fuel filter.

SERVICE STARTER MOTOR DRIVE

Service instructions for the starter motor drive.

CLEAN CYLINDER HEADS AND COMBUSTION CHAMBERS

Cleaning procedures for cylinder heads and combustion chambers.

CHECK VALVE-TO-TAPPET CLEARANCE

Measuring valve-to-tappet clearance for proper engine function.

REMOVE AIR CLEANER, VALVE COVERS, BREATHER, AND SPARK PLUGS

Steps for removing air cleaner, valve covers, breather, and spark plugs.

MEASURE VALVE-TO-TAPPET CLEARANCE

Detailed instructions for measuring valve-to-tappet clearance.

REINSTALL SPARK PLUGS, BREATHER, VALVE COVERS, AND AIR CLEANER

Reassembly steps for spark plugs, breather, valve covers, and air cleaner.

STORAGE

Procedure for engine storage during non-operational periods.

SECTION 4 TROUBLESHOOTING

TROUBLESHOOTING GUIDE

A guide to identifying and resolving engine problems.

ENGINE KNOCKS

Troubleshooting causes and solutions for engine knocks.

ENGINE LOSE POWER

Diagnosing and fixing engine power loss issues.

ENGINE USES EXCESSIVE AMOUNT OF OIL

Causes and solutions for excessive oil consumption.

EXTERNAL ENGINE INSPECTION

Steps for performing an external inspection of the engine.

CLEANING THE ENGINE

Procedure for cleaning the engine components.

BASIC ENGINE TESTS

Overview of fundamental engine tests.

CRANKCASE VACUUM TEST

Procedure and interpretation of the crankcase vacuum test.

COMPRESSION TEST

How to perform a compression test on the engine.

LOW COMPRESSION

Causes and solutions for low engine compression.

CYLINDER LEAKDOWN TEST

Procedure for conducting a cylinder leakdown test.

LEAKDOWN TEST RESULTS

Interpreting the results of a cylinder leakdown test.

SECTION 5 AIR CLEANER

SQUARE

Disassembly and reassembly of the square air cleaner assembly.

DOME

Disassembly and reassembly of the dome air cleaner assembly.

ANTI-ICING

Instructions for preventing icing in the air cleaner during cold weather.

POSITION AIR CLEANER AS SHOWN BELOW FOR PROPER ENGINE OPERATION

Visual guide for correct air cleaner positioning.

SECTION 6A FUEL SYSTEMS AND GOVERNORS

FUEL SYSTEM

Overview of the fuel system and its operation.

TROUBLESHOOTING

Troubleshooting common fuel system and governor issues.

FUEL FILTER

Details about the inline fuel filter and its inspection.

FUEL PUMP

Information on the mechanical fuel pump operation.

CARBURETOR

Adjustment, disassembly, cleaning, and repair of Kohler carburetors.

GOVERNOR

Explanation of the governor mechanism and its operation.

ADJUSTMENT

Procedures for adjusting governor settings.

ENGINE MOUNTED THROTTLE AND CHOKE CONTROLS

Disassembly and reassembly of throttle and choke controls.

SECTION 6B FUEL SYSTEMS

CARBURETOR SERVICE (WALBRO-BUILT)

Service procedures for Walbro-built carburetors.

TROUBLESHOOTING

Troubleshooting common issues with Walbro carburetors.

ADJUSTING WALBRO CARBURETORS

Instructions for adjusting Walbro carburetors.

HIGH ALTITUDE OPERATION (FIXED MAIN CARBURETORS)

Adjustments for high altitude operation on fixed main carburetors.

LPG CARBURETOR

Information on Kohler LPG carburetors.

SECTION 7 LUBRICATION SYSTEM

OPERATION

Explanation of the full-pressure lubrication system.

LUBRICATION SYSTEM SERVICE

Service procedures for the lubrication system components.

OIL FILTER

Details on the oil filter and its installation.

OIL SENTRY™ OIL PRESSURE MONITOR

Information on the Oil Sentry™ pressure monitor.

SECTION 8 ELECTRICAL SYSTEM AND COMPONENTS

MAGNUM ELECTRONIC MAGNETO IGNITION SYSTEM

Description of the electronic magneto ignition system.

IGNITION SYSTEM TROUBLESHOOTING GUIDE

Guide to troubleshooting the ignition system.

IGNITION MODULE

Installation and adjustment of the ignition module.

DIODE TEST

Procedure for testing the ignition system diode.

SPARK PLUGS

Service and inspection of spark plugs.

ELECTRICAL SYSTEMS WIRING DIAGRAMS AND BATTERY CHARGING SYSTEMS

Wiring diagrams and information on battery charging systems.

TROUBLESHOOTING GUIDE

Troubleshooting common electrical system issues.

BATTERY

Information regarding battery maintenance and testing.

SOLENOID

Description and testing of the starter solenoid.

ELECTRIC STARTER

Overview of the electric starter and its components.

BENDIX DRIVE ELECTRIC STARTER

Explanation of the Bendix drive electric starter operation.

BRUSH REPLACEMENT

Procedure for replacing starter brushes.

STARTER SERVICE

Service and reassembly of the starter.

SECTION 9 DISASSEMBLY

DISCONNECT SPARK PLUG LEADS, DRAIN OIL AND REMOVE OIL FILTER

Initial steps for disassembly: spark plug leads, oil drain, filter.

REMOVE MUFFLERS AND EXHAUST ELBOWS

Steps to remove mufflers and exhaust elbows.

REMOVE AIR CLEANER

Procedure for removing the air cleaner assembly.

REMOVE INTAKE MANIFOLD AND CARBURETOR

Steps to remove the intake manifold and carburetor.

DISCONNECT WIRING; REMOVE RECTIFIER-REGULATOR, KEY SWITCH, AND SOLENOID

Disconnecting electrical components before further disassembly.

REMOVE TOP BAFFLE, CYLINDER HEAD BAFFLES, AND BLOWER HOUSING

Removing top baffle, cylinder head, and blower housing.

REMOVE BREATHER AND VALVE COVER

Removing the breather and valve cover.

REMOVE IGNITION MODULE AND BRACKET

Removing the ignition module and its mounting bracket.

REMOVE FUEL PUMP

Procedure for removing the fuel pump.

REMOVE GRASS SCREEN, FLYWHEEL, AND FAN

Removing grass screen, flywheel, and fan.

REMOVE ELECTRIC STARTER

Steps to remove the electric starter.

REMOVE STATOR

Procedure for removing the engine stator.

IDENTIFY ENGINE SIDES

Identifying the engine's #1 and #2 sides for disassembly.

REMOVE CYLINDER BARRELS

Steps for removing cylinder barrels.

REMOVE SPARK PLUGS AND CYLINDER HEADS

Removing spark plugs and cylinder heads.

REMOVE VALVES

Procedure for removing engine valves.

REMOVE PISTONS FROM CONNECTING RODS

Separating pistons from connecting rods.

REMOVE PISTON RINGS

Procedure for removing piston rings.

REMOVE CLOSURE PLATE, OIL PRESSURE RELIEF VALVE, AND REAR OIL SEAL

Removing closure plate, oil pressure relief valve, and rear oil seal.

SPLIT THE CRANKCASE

Steps for splitting the engine crankcase.

REMOVE CAMSHAFT AND TAPPETS

Removing the camshaft and tappets from the crankcase.

REMOVE CRANKSHAFT, FRONT OIL SEAL, AND BEARINGS

Removing crankshaft, front oil seal, and bearings.

REMOVE CONNECTING RODS

Procedure for removing connecting rods.

REMOVE GOVERNOR GEAR AND CROSS SHAFT

Removing the governor gear and cross shaft.

REMOVE OIL PICKUP AND OIL PUMP

Removing the oil pickup and oil pump components.

OIL PUMP

Procedure for removing the oil pump cover and components.

SECTION 10 INSPECTION AND RECONDITIONING

INSPECTION

General inspection guidelines for engine parts.

FLYWHEEL

Inspection procedures for the engine flywheel.

CYLINDER HEADS

Inspection of cylinder heads for damage or wear.

CYLINDER BARRELS

Inspection and reconditioning of cylinder barrels.

HONING

Procedure and recommendations for honing cylinder barrels.

MEASURING PISTON-TO-BORE CLEARANCE

Measuring piston-to-bore clearance for proper fit.

VALVES

Inspection and service procedures for engine valves.

30° CHANGE OVER

Information on 30° valve changeover for specific serial numbers.

VALVE SEAT INSERTS

Procedures for installing and removing valve seat inserts.

PISTONS AND RINGS IDENTIFICATION

Identification of piston and ring types.

SERVICE

Service recommendations for pistons and rings.

MEASURING PISTON RING END GAP

Procedure for measuring piston ring end gap.

MEASURING PISTON SIDE CLEARANCE

Procedure for measuring piston side clearance.

POSI-LOCK CONNECTING RODS

Information on Posi-Lock connecting rods.

CAMSHAFT AND CRANKSHAFT INSPECTION AND SERVICE

Inspection and service of camshaft and crankshaft.

CAMSHAFT/VALVE TO TAPPET CLEARANCE CHANGE

Procedure for changing camshaft/valve to tappet clearance.

OIL PUMP

Inspection and service of the engine oil pump.

SECTION 11 REASSEMBLY

INSTALL OIL PUMP AND OIL PICKUP

Installing the oil pump and oil pickup components.

INSTALL CROSS SHAFT AND GOVERNOR SHAFT

Installing the cross shaft and governor shaft.

INSTALL CONNECTING RODS

Procedure for installing connecting rods.

INSTALL BEARINGS AND CRANKSHAFT

Installing crankshaft bearings and crankshaft.

INSTALL CAMSHAFT AND TAPPETS

Installing the camshaft and tappets.

INSTALL CYLINDER HEADS AND SPARK PLUGS

Installing cylinder heads and spark plugs.

PREPARE THE ENGINE FOR OPERATION

Final checks and preparation before operating the engine.

TESTING THE ENGINE

Procedure for testing the engine after reassembly.

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