Yanmar 3YM30, Руководство по обслуживанию

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6. Fuel injection equipment
142
Fault Cause Remedy
2. Engine starts, but
immediately stops.
(1) Fuel pipe is clogged.
(2) Fuel filter is clogged.
(3) Improper air- tightness of the fuel pipe
connection or pipe is broken and air is being
sucked in.
(4) Insufficient fuel delivery from the feed pump
Clean
Disassemble and clean,
or replace the element
Replace packing repair
pipe
Repair or replace
3. Engine’s
output is
insufficient.
Defective
injection timing
and other
failures. (1) Knocking sounds caused by improper (too
fast) injection timing.
(2) Engine overheats or emits large amount of
smoke due to improper (to slow) injection
timing.
(3) Insufficient fuel delivery from feed pump.
Inspect and adjust
Inspect and adjust
Repair or replace
Nozzle
movements is
defective. (1) Case nut loose.
(2) Defective injection nozzle performance.
(3) Nozzle spring is broken.
(4) Excessive oil leaks from nozzle. Inspect and retighten
Repair or replace nozzle
Replace
Replace nozzle assembly
Injection pump
is defective. (1) Max delivery limit boll is screwed in too far.
(2) Plunger is worn
(3) Injection amount is not uniform.
(4) Injection timings are not even.
(5) The 1st and 2nd levers of the governor and
the control rack or the injection pump are
improperly lined up.
(6) Delivery stopper is loose.
(7) Delivery packing is defective.
(8) Delivery valve seat is defective.
(9) Delivery spring is broken.
Adjust
Replace
Adjust
Adjust
Repair
Inspect and retighten
Replace packing
Repair or replace
Replace
4. Idling is rough. (1) Movement of control rack is defective.
1) Stiff plunger movement or sticking.
2) Rack and pinion fitting is defective.
3) Movement of governor is improper
4) Delivery stopper is too tight.
(2) Uneven injection volume.
(3) Injection timing is defective.
(4) Plunger is worn and fuel injection adjustment
is difficult.
(5) Governor spring is too weak.
(6) Feed pump can’t feed oil at low speeds.
(7) Fuel supply is insufficient at low speeds due
to clogging of fuel filter.
Repair or replace
Repair
Repair
Inspect and adjust
adjust
adjust
Replace
Replace
Repair or replace
Disassemble and clean,
or replace element
5. Engine runs at high
speeds, but cuts out at low
speeds.
(1) The wire or rod of the accel is caught.
(2) Control rack is caught and can’t be moved. Inspect and repair
Inspect and repair
6. Engine doesn’t reach max.
speed
(1) Governor spring is broken or excessively
worn.
(2) Injection performance or nozzle is poor
Replace
Repair or replace