Yanmar 3JH3E - Page 89

Chapter 3 Fuel Injection Equipment
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Malfunctions
3. The injection
timing is too
retarded and the
engine
is
overheating or
the exhaust
conta·1ns smoke
4. The nozzle or
the nozzle
holder is not
functioning
properly
The engine
cannot reach its
maximum speed
The engine's
maximum speed
is
too high
Idling is unstable
Causes
1. The governor spring is too weak
or
is improperly adjusted
2. The control lever is not reaching
the maximum-speed position
3. The nozzle's injection operation is
poor
1. The governor spring is too strong
or
is improperly adjusted
2. The governor flyweights or
governor sleeve movement
is not
smooth
1. The injection quantities are not
uniform (the delivery valve is not
operating properly)
2. The governor's idling adjustment
is improperly adjusted
3. The plunger is worn
4. The plunger spring IS broken
5. The rubber damper is worn.
6. The governor lever shaft pin is
worn excessively
7. The feed pump blades are not
operating properly
8. The regulating valve is stuck in
the open position
9. The fuel filter element is clogged
and therefore fuel oil delivery is
poor
10. The nozzle or the nozzle holder
is not functioning properly
3-44
Remedies
Readjust
Inspect and then repair or replace
Readjust or replace
Readjust
Repair or replace
Readjust or replace
Repair or replace
Inspect or replace
Readjust
Replace the distributor assembly
Replace
Replace
Replace
Repair or replace
Replace
Clean or replace
Inspect and then repair or replace
Printed in Japan
HINSHI-H8009