Yanmar 3JH3E Service Manual page 88

Chapter 3 Fuel Injection Equipment
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3,4JH3(B)(C)E
Malfunctions
The engine
exhaust contains
smoke and the
engine "knocks"
The engine
output is unstable
Insufficient
output
1. The injection
quantity is
insufficient
2. The injection
timing is too
advanced and
the engine is
"knocking"
Printed in Japan
HINSHr-H8009
Causes Remedies
1. The injection timing is incorrect
Readjust the timing
2. The nozzle or nozzle holder is
Inspect, then repair or replace
functioning incorrectly
3. The injection quantity is
Readjust
excessive
1 . The fuel filter element is clogged Clean or replace
and fuel oil delivery is poor
2. The amount of fuel or pressure Inspect and repair
delivered by the feed pump is too
little
3. The injection pump is sucking air
Inspect and repair
4. The regulating valve is stuck in
Replace
the open position
5. The plunger is sticking and does Replace the distributor assembly
not travel its full stroke
6. The plunger spring IS broken Replace
7. The control sleeve is not sliding Repair or replace
smoothly
8. The governor lever is not Repair or replace
operating properly or is worn
excessively
9. The delivery valve spring is
Replace
broken
10. The delivery valve is not sliding Repair or replace
properly
11. The nozzle or the nozzle holder
Inspect, and then repair or replace
is not functioning properly
12. The injection timing is incorrect
Readjust
1. The specified full-load injection Readjust
quantity is not delivered
2. The control lever is not reaching
Readjust
the maximum speed position
3. The governor spring is weak and Replace
therefore the governed speed is
too low
4. The plunger is worn Replace the distributor assembly
5. The delivery valve seating Replace
portions are damaged
Readjust
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