Service manual
Table Of Contents
- Cover
- History of Revision
- FOREWORD
- CONTENTS
- FOR SAFETY
- 1. General
- 2. Inspection and adjustment
- 2.1 Periodic maintenance schedule
- 2.2 Periodic inspection and maintenance procedure
- 2.2.1 Check before starting
- 2.2.2 inspection after initial 50 hours or one month operation
- 2.2.3 Inspection every 50 hours or monthly
- 2.2.4 Inspection every 100 hours six months
- 2.2.5 Inspection every 150 hours or one year
- 2.2.6 Inspection every 250 hours or one year
- 2.2.7 Inspection every 1,000 hours or four years
- 2.3 Adjusting the no-load maximum or minimum speed
- 2.4 Sensor Inspection
- 2.5 Thermostat inspection
- 2.6 Adjusting operation
- 2.7 Long storage
- 3. Troubleshooting
- 4. Disassembly and reassembly
- 5. Inspection and servicing of basic engine parts
- 6. Fuel injection equipment
- 6.1 Fuel Injection pump/governor
- 6.1.1 Fuel system diagram
- 6.1.2 Fuel injection pump service data and adjustment
- 6.1.3 Fuel injection pump structure
- 6.1.4 Removing a fuel injection pump
- 6.1.5 Installing a fuel injection pump
- 6.1.6 Adjusting fuel injection timing
- 6.1.7 Troubleshooting of fuel injection pump
- 6.1.8 Major faults and troubleshooting
- 6.2 Fuel feed pump
- 6.3 Fuel filter
- 6.4 Fuel tank
- 6.1 Fuel Injection pump/governor
- 7. Intake and exhaust system
- 8. Lubrication system
- 9. Cooling water system
- 9.1 Cooling water system
- 9.2 Seawater pump
- 9.3 Fresh water pump
- 9.4 Heat exchanger
- 9.5 Pressure cap and coolant recovery tank
- 9.5.1 Pressure cap construction
- 9.5.2 Pressure cap pressure control
- 9.5.3 Pressure cap inspection
- 9.5.4 Replacing filler neck
- 9.5.5 Function of the coolant recovery tank
- 9.5.6 Specifications of coolant recovery tank
- 9.5.7 Mounting the coolant recovery tank
- 9.5.8 Precautions on usage of the coolant recovery tank
- 9.6 Thermostat
- 9.7 Bilge pump and bilge strainer (Optional)
- 10. Reduction and reversing gear
- 11. Remote control (Optional)
- 12. Electrical system
- 13. Service standards
- 14. Tightening torque for bolts and nuts
- Colophon
- Back cover
FOREWORD
This service manual has been complied for engineers engaged in sales, service, inspection and
maintenance. Accordingly, descriptions of the construction and functions of the engine are emphasized
in this manual, while items, which should already be common knowledge, are omitted.
One characteristic of a marine diesel engine is that its performance in a vessel is governed by the
applicability of the vessel's hull construction and its steering system.
Engine installation, fitting out and propeller selection have a substantial effect on the performance of the
engine and the vessel. Moreover, when the engine runs unevenly or when trouble occurs, it is essential
to check a wide range of operating conditions - such as installation to the full and suitability of the ship's
piping and propeller - and not just the engine itself. To get maximum performance from this engine, you
should completely understand its functions, construction and capabilities, as well as proper use and
servicing.
Use this manual as a handy reference in daily inspection and maintenance, and as a text for engineering
guidance.
Model 3YM30 has been used for the illustrations in this service manual, but they apply to other models in
the 3YM series engines.
2005 YANMAR CO., LTD
All rights reserved. This manual may not be
reproduced or copied, in whole or in part,
without the written permission of YANMAR
CO., LTD.
c
California
Proposition 65 Warning
Diesel engine exhaust and some of its
constituents are known to the State of
California to cause cancer, birth de-
fects, and other reproductive harm.
California
Proposition 65 Warning
Battery posts, terminals, and related ac-
cessories contain lead and lead com-
pounds, chemicals known to the State
of California to cause cancer and repro-
ductive harm.
Wash hands, after handling.
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