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Kohler Command CH25

Kohler Command CH25
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SERVICE MANUAL
HORIZONTAL CRANKSHAFT
COMMAND CH18-750

Questions and Answers:

Kohler Command CH25 Specifications

General IconGeneral
BrandKohler
ModelCommand CH25
CategoryEngine
LanguageEnglish

Summary

Section 1 Safety and General Information

Safety Precautions

To ensure safe operation, read and understand safety statements. Refer to manufacturer's manual.

WARNING, CAUTION, NOTE Definitions

Definitions of warning indicators for hazards and important information.

Engine Identification Numbers

Provides details on identifying engines by Model, Specification, and Serial Numbers for parts ordering.

Oil Recommendations

Proper oil type and weight are crucial for engine longevity. Check and change oil regularly.

Fuel Recommendations

Use clean, fresh, unleaded gasoline with appropriate octane rating. Avoid old or blended fuels.

Periodic Maintenance Instructions

Schedule for required maintenance procedures at specified intervals for optimal engine performance.

General Specifications

Detailed specifications including power, torque, bore, stroke, displacement, compression ratio, dry weight, and oil capacity.

General Torque Values

Metric fastener torque recommendations based on property class and application into aluminum.

Section 2 Tools & Aids

Separate Tool Suppliers

Lists suppliers for specialized tools and their contact information.

Tools

Lists specific tools required for engine service with their descriptions and part numbers.

Aids

Lists various aids such as lubricants and sealants required for engine assembly and maintenance.

Special Tools You Can Make

Provides instructions for fabricating specific tools for engine service using common parts.

Section 3 Troubleshooting

Troubleshooting Guide

Lists common engine problems and their potential causes for quick diagnosis.

External Engine Inspection

Guides on inspecting the engine's external condition before disassembly to identify potential issues.

Cylinder Leakdown Test

Detailed procedure for performing a cylinder leakdown test to assess valve and ring condition.

Section 4 Air Cleaner and Air Intake System

Standard Air Cleaner Service

Routine checks and maintenance for the standard air cleaner assembly to prevent wear.

Heavy-Duty Air Cleaner General

Overview of the heavy-duty air cleaner system, its components, and CARB/EPA certification.

Air IntakeCooling System

Emphasizes keeping the engine clean for proper cooling and preventing overheating damage.

Section 5 Fuel System and Governor

Fuel System Components

Lists the key components of a typical carbureted fuel system.

Fuel System Tests

Provides a systematic approach to test fuel system components when the engine has starting or running issues.

Troubleshooting - Carburetor Related Causes

Lists common carburetor issues, their probable causes, and recommended remedies.

Fuel Shut-off Solenoid

Explains the function of the fuel shut-off solenoid and provides a test procedure for its operation.

Section 5 A LPG Fuel Systems

LPG Fuel System Components

Lists the typical components of a liquid withdrawal LPG fuel system.

Troubleshooting Checklist

Initial checks for LPG engines experiencing starting, running, or idling problems.

LPG Carburetor Adjustments

General information on LPG carburetors, noting preset fuel mixture settings.

Impco (Beam) Regulator

Detailed explanation of the Impco (Beam) regulator's operation and patented design features.

Nikki Regulator Secondary Chamber

Details the secondary chamber's role in reducing fuel pressure and the vacuum lock-off mechanism.

Section 5 B EFI Fuel System

Initial StartingPriming Procedure

Important steps for purging air (priming) the EFI system before initial start-up.

Important Service Notes!

Crucial precautions and guidelines for servicing the EFI system to prevent damage and ensure safety.

Electronic Control Unit (ECU)

Details the ECU's role as the system's brain, its functions, and critical relationships with other sensors.

Throttle Position Sensor (TPS)

Explains how the TPS indicates throttle plate angle to the ECU for fuel and ignition settings.

TPS Initialization Procedure

Crucial steps for synchronizing the TPS with the ECU after component replacement or adjustment.

Fuel System

General warning about fuel system pressure and initial testing procedures.

Fault Codes

Explains how the ECU monitors operation, activates the MIL, and stores diagnostic codes.

Troubleshooting Flow Chart

Provides a visual flowchart for troubleshooting the EFI system.

Section 6 Lubrication System

Oil Recommendations

Guidance on selecting the correct oil type and viscosity based on temperature.

Checking Oil Level

Instructions for checking the engine oil level before each use using the dipstick.

Changing Oil and Oil Filter

Procedures for changing engine oil and filter at recommended intervals.

Oil Sentry

Overview of the Oil Sentryâ„¢ system for monitoring oil pressure and its function.

Section 7 Retractable Starter

WARNING: Spring Under Tension!

Critical safety warning about the tension in retractable starter springs and the need for eye protection.

To Remove Starter

Step-by-step instructions for removing the retractable starter from the blower housing.

Rope Replacement

Instructions for replacing the starter rope without complete starter disassembly.

Disassembly

Detailed instructions for disassembling the retractable starter, emphasizing spring tension safety.

Section 8 Electrical System and Components

Spark Plugs

Information on spark plug types, gap settings, and service procedures.

Battery

General information on battery requirements, maintenance, and voltage testing.

Electronic CD Ignition Systems

Introduces CD ignition systems and how SMART-SPARKâ„¢ is an advanced version.

Troubleshooting Guide

Troubleshooting guide for 15/20/25 Amp battery charging systems, covering no charge and high charge issues.

Electric Starting Motors

Overview of inertia drive and solenoid shift starting motors.

Solenoid Shift Electric Starters

Overview of solenoid shift starters and their operation.

Section 9 Disassembly

WARNING: Accidental Starts!

Critical safety warning to disable the engine before working on it to prevent accidental starting.

Typical Disassembly Sequence

A suggested sequence for complete engine disassembly, adaptable for options.

Shut Off Fuel Supply

Initial step to shut off fuel supply before draining oil or removing the oil filter.

Remove Air Cleaner Assembly

Steps for removing the standard air cleaner assembly.

Remove Fuel Pump

Procedures for disconnecting fuel lines and removing pulse-style and mechanical fuel pumps.

Remove Carburetor

Procedures for disconnecting fuel lines, linkages, and removing the carburetor assembly.

Remove Outer Baffles and Blower Housing

Steps for disconnecting plugs, removing baffles, and detaching the blower housing.

Remove Cylinder Heads and Hydraulic Lifters

Steps for removing cylinder heads, push rods, and hydraulic lifters.

Remove Flywheel

Procedures for removing the flywheel, emphasizing safety and proper tool usage.

Remove Closure Plate Assembly

Procedures for removing the closure plate, emphasizing breaking the RTV seal.

Remove Connecting Rods with Pistons and Rings

Steps for removing connecting rod bolts, end caps, and piston/rod assemblies.

Section 10 Inspection and Reconditioning

Camshaft Inspection and Service

Guidelines for inspecting camshaft lobes and gear teeth for wear or damage.

Crankshaft Inspection and Service

Procedures for inspecting crankshaft bearing surfaces, keyways, crankpin, and installing new plugs.

Honing

Detailed procedures for honing cylinder bores, including tool speeds and stone selection.

Cylinder Head and Valves Inspection and Service

How to check cylinder head flatness, inspect valve components, and check valve stem clearance.

Piston Ring Inspection

Key points for servicing piston rings, including deglazing, cleaning grooves, and checking end gap.

Hydraulic Lifters Inspection

Guidelines for inspecting hydraulic lifter base surfaces for wear or damage.

Section 11 Reassembly

Typical Reassembly Sequence

A suggested sequence for complete engine reassembly after component work.

Install Flywheel End Oil Seal

Steps for installing the flywheel end oil seal, ensuring proper alignment and depth.

Install Connecting Rods with Pistons and Rings

Detailed instructions for staggering piston rings, lubricating components, and installing piston assemblies.

Install Camshaft

Steps for lubricating and installing the camshaft, aligning timing marks.

Install Ignition Modules

Steps for installing ignition modules, including positioning the magnet and setting air gap.

Install Intake Manifold

Procedures for installing the intake manifold with new gaskets/O-Rings and torque sequence.

Install Electric Starter Motor

Steps for installing the electric starter motor, including torque specifications.

Install Fuel Pump

Procedures for installing the pulse-style fuel pump and lines, including torque.

Install Carburetor

Steps for installing the carburetor assembly, including new gaskets and linkages.

Install External Governor Controls

Procedure for installing the governor lever onto the governor cross shaft.

Install Throttle & Choke Controls

Procedures for connecting choke linkage and mounting the main control bracket.

Install Valve Covers

Procedures for installing valve covers, noting differences in types and sealant application.

Install Oil Filter and Fill Crankcase with Oil

Procedures for prefilling and installing the oil filter, and filling the crankcase with oil.

Prepare the Engine for Operation

Final checks and preparations before starting the engine after reassembly.

Testing the Engine

Recommended procedures for testing the engine on a test stand before installation.

Section 12 Clutch

Clutch General

Introduction to the wet disc type clutch and its exploded view.

Service

Information on lubrication, oil changes, and checking clutch engagement pressure.

Adjustment

Procedure for adjusting clutch engagement pressure and troubleshooting slips or disengagement.

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