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Onan MDJA - User Manual

Onan MDJA
92 pages
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Service
Manual
MDJA
MDJB
MDJC
MDJE
MDJF
Marine Diesel
GenSet
Engines
974-0750
12-85
Printed
in
USA
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Onan MDJA Specifications

General IconGeneral
BrandOnan
ModelMDJA
CategoryEngine
LanguageEnglish

Summary

Safety Precautions

Safety Codes

Compliance with all applicable local, state, and federal safety codes.

General Safety Guidelines

Basic safety rules including fire safety, moving parts, and securing components.

System-Specific Safety

Safety advice for fuel, exhaust, cooling systems, and batteries.

Engine Specifications and Information

General Information

Explains the manual's purpose, scope, and how to use its sections.

Engine Model Reference

Guidance on identifying engine models using the unit's nameplate.

Engine Specifications

Technical specifications for various engine models, including bore, stroke, and capacities.

Dimensions and Clearances

Detailed measurements and clearance limits for engine components.

Maintenance and Troubleshooting

Assembly Torques and Special Tools

Torque values for assembly and a list of specialized service tools.

Engine Troubleshooting Guide

A guide to diagnosing and resolving common engine problems by system.

Service and Maintenance Procedures

Pre-starting checks, oil, and fuel recommendations for engine service.

Starting Procedures

Instructions for bleeding fuel, pre-heating, and starting the engine.

Operational Guidance

Advice on applying load, break-in, and handling engine failures.

Fuel System

Fuel System Overview and Recommendations

Fuel recommendations, system components, and filter system description.

Fuel Transfer Pump Operation

Details on the fuel transfer pump's operation, pressure, and removal.

Injection Nozzle Testing and Adjustment

Procedures for testing nozzle spray patterns, pressure, and making adjustments.

Injection Pump Timing and Repair

Methods for timing injection pumps and general repair considerations.

Bryce;Kiki Fuel System Details

Information on Bryce/Kiki fuel systems, pumps, and flow timing procedures.

Pump Troubleshooting and Nozzle Tests

Diagnosing pump problems and performing nozzle tests.

Cooling System

Cooling System Inspection and Draining

Procedures for inspecting components and draining the cooling system.

Cooling System Cleaning and Filling

Steps for cleaning, flushing, and filling the cooling system.

Marine Cooling System Types

Details on heat exchanger, keel, and direct sea water cooling systems.

Marine Water Pumps

Information on different water pump types, their identification, and procedures.

Hose, Belt, and Pressure Cap Maintenance

Maintenance for hoses, belts, pressure caps, and thermostats.

Oil System and Governor System

Oil System and Oil Pump

Overview of the lubrication system and procedures for the oil pump.

Bypass Valve and Switches

Information on the bypass valve and low oil/centrifugal switches.

Governor System Overview and Adjustments

Purpose, maintenance, and adjustment of the engine governor system.

Starting System and Engine Disassembly

Starting System Overview and Testing

Introduction to the starting system and basic testing procedures.

Starter Motor Repair

Procedures for repairing starter motor components like armature, brushes, and clutch.

Prestolite and Mitsubishi Starter Procedures

Removal, installation, disassembly, and assembly for Prestolite and Mitsubishi starters.

Engine Disassembly and Reassembly

General procedures for disassembling and reassembling the engine.

Valve Clearance and Cylinder Head Procedures

Adjusting valve clearance, testing compression, and head/valve disassembly.

Crankshaft and Bearing Procedures

Procedures for flywheel, gear cover, governor, camshaft, crankshaft, and piston assembly.

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