Service manual

TROUBLESHOOTING
MP Pump Service Manual YAMMAR.
Correction
Fill with fuel.
Disassemble and clean, or
replace element. Find and repair
source of debris in fuel.
Clean complete fuel system.
Locate air leak using clear fuel
line and repair.
Repair or replace.
Replace.
Replace.
Check and refill with proper fuel.
Repair or replace.
Determine cause of high fuel
temperature and repair.
and
and adjust.
Replace.
Repair or replace nozzle.
Inspect and retighten.
Replace.
Replace nozzle assembly.
Replace hydraulic head and
filters.
Calibrate pump to specifications.
Inspect and retighten.
Repair or replace.
Replace packing.
Replace.
Cause
(1) Engine is out of fuel.
(2) Fuel filter element is clogged.
(3) Fuel line is clogged.
(4) Air in fuel lines.
(5) Insufficient fuel delivery from the feed pump.
(6) Stop solenoid is defective.
(7) Charge pump is defective.
(1) Type of fuel is incorrect.
(2) Insufficient fuel delivery from feed pump.
(3) Fuel temperature is high.
(4) Knocking sounds caused by improper (too fast) injection
timing.
(5) Engine overheats or emits large amount of smoke due to
improper (too slow) injection timing.
(6) Charge pump is defective.
(1) Defective injection nozzle performance.
(2) Case nut is loose.
(3) Nozzle spring is broken.
(4) Excessive oil leaks from nozzle.
(1) Plunger is worn.
(2) Fuel limiter improperly tampered with by operator.
(3) Delivery holder is loose
(4) Delivery valve seat is defective.
(5) Delivery packing is defective.
(6) Delivery spring is broken.
Complaint
2. Engine starts, but
immediately stops.
3. Engine
Output is
insufficient.
Defective
injection
timing, and
other
failures.
movement is
defective.
Fuel
Injection
pump is
defective.