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Onan JC Service Manual

Onan JC
75 pages
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Onan JC Specifications

General IconGeneral
Fuel TypeGasoline or LP Gas
Governor TypeMechanical
Cylinders2
Bore3.25 in. (82.55 mm)
Firing Order1-2
Starting SystemElectric
Cooling SystemAir-cooled
Lubrication SystemPressure
Fuel SystemCarburetor

Summary

Safety Precautions

Safety Codes

Ensures compliance with all local, state, and federal safety codes.

Specifications

Dimensions and Clearances

Details physical dimensions, bearing clearances, and component measurements.

Assembly Torques and Special Tools

Assembly Torques

Provides torque values for engine assembly to ensure proper tightness and prevent damage.

Installation

General Installation Guidelines

Covers initial setup, location selection, and mounting requirements for optimal performance.

Operation

Pre-Starting and Initial Checks

Guides users through essential checks before starting the engine.

Starting Procedures

Explains electric and manual starting sequences, including choke and oil pressure checks.

Troubleshooting Guide

Service and Maintenance

Crankcase Oil and Filter Service

Details procedures for changing oil, replacing the oil filter, and cleaning the breather.

Fuel System

Carburetor Service and Adjustment

Details maintenance, disassembly, and adjustment for gasoline, gaseous, and combination carburetors.

Ignition System

Breaker Points and Timing

Explains how to check, adjust, and time breaker points for proper ignition.

Governor System

Governor Adjustments

Details procedures for adjusting governed speed and sensitivity using various methods.

Starting System

Flywheel Alternator

Charging Circuit Testing

Details procedures for testing the battery, regulator-rectifier, and alternator.

Regulator-Rectifier Testing

Outlines steps to test the regulator-rectifier for proper operation and voltage output.

Flywheel Stator Testing

Provides methods for testing the flywheel stator's continuity and grounding.

Engine Disassembly and Repair

Piston, Cylinder, and Connecting Rod Service

Details procedures for removing, inspecting, and installing pistons, cylinders, and connecting rods.

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