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
6. Fuel injection equipment
141
6.1.7 Troubleshooting of fuel injection pump
Complete repair means not only replacing defective parts, but finding and eliminating the cause of the
trouble as well. The cause of the trouble may not necessarily be in the pump itself, but may be in the
engine or the fuel system. If the pump is removed prematurely, the true cause of the trouble may never
be known. Before removing the pump from the engine, at least go through the basic check points given
here.
Basic checkpoints
• Check for breaks or oil leaks throughout the fuel system, from the fuel tank to the nozzle.
• Check the injection timings for all cylinders. Are they correctly adjusted? Are they too fast or too slow?
• Check the nozzle spray.
• Check the fuel delivery. Is it in good condition? Loosen the fuel pipe connection at the injection pump
inlet, and test operate the fuel feed pump.
6.1.8 Major faults and troubleshooting
Fault Cause Remedy
1. Engine
won’t start
Fuel not
delivered to
injection pump
(1) No fuel in the fuel tank.
(2) Fuel tank cock is closed.
(3) Fuel pipe system is clogged
(4) Fuel filter element is clogged
(5) Air is sucked into the fuel due to defective
connections in the piping from the fuel tank
to the fuel pump.
(6) Defective valve contact of feed pump
(7) Piston spring of feed pump is broken.
(8) Inter-spindle or tappets of feed pump are
stuck
Re-supply
Open
Clean
Disassemble and clean,
or replace element
Repair
Repair or replace
Replace
Repair or replace
Fuel delivered
to injection
pump.
(1) Defective connection of control lever and
accel rod of injection pump.
(2) Plunger is worn out or stuck.
(3) Delivery valve is stuck
(4) Control rack doesn’t move
(5) Injection pump coupling is damaged, or the
key is broken.
Repair or adjust
Repair or replace
Repair or replace
Repair or replace
Replace
Nozzle doesn’t
work.
(1) Nozzle valve doesn’t open or close normally
(2) Nozzle seat is defective.
(3) Case nut is loose.
(4) Injection nozzle starting pressure is too low
(5) Nozzle spring is broken.
(6) Fuel oil filter is clogged.
(7) Excessive oil leaks from the nozzle sliding
area.
Repair or replace
Repair or replace
Inspect and tighten
Adjust
Replace
Repair or replace
Replace the nozzle
assembly
Injection
timing is
defective.
(1) Injection timing is retarded due to failure of
the coupling.
(2) Camshaft is excessively worn.
(3) Roller guide incorrectly adjusted or
excessively worn.
(4) Plunger is excessively worn.
Adjust
Replace camshaft
Adjust or replace
Replace plunger
assembly