TROUBLESHOOTING
41
Table
1
ENGINE
TROUBLESHOOTING
(continued)
Trouble
Probable
cause
Engine
stops
suddenly (continued) Governor malfunction
Engine seized
Engine
slows
unexpectedly Overload
Fuel filter or fuel lines clogged
Air in fuel system
Water in fuel
Misadjusted
governor
Piston or bearing seizure
Engine will not run under full load Clogged fuel filter
Faulty fuel feed
pump
Worn fuel injection
pump
Engine knocks Excessive bearing clearance
Loose rod
bolt
Loose flywheel or coupling
bolt
Incorrect injection
timing
Excessive fuel injected
into
cylinder
Low oil pressure Oil leaks
Excessive bearing clearance
Clogged oil filter element
Faulty oil pressure regulator valve
Low oil
viscosity
Overheating Dirty cooling system
Faulty thermostat
Insufficient coolant
flow
Insufficent coolant in closed system
Air
entering system
Correction
Repair
governor
Inspect and repair
Locate cause
for
overload and rectify
Inspect and unclog or replace
Bleed air in fuel system
Remove water
Adjust
governor
Repair damaged components; determine
cause
Clean fuel filter
Repair fuel feed pump
Repair or replace fuel InJection pump
Inspect and repair
Inspect and repair
Tighten
bolt
Adjust
timing
Inspect fuel injection pump and injectors
Inspect and repair
Inspect and repair
Clean or replace filter element
Repair oil pressure regulator valve
Replace oil; check
for
dilution
due to fuel
leaking
into
crankcase
Flush cooling system
Replace thermostat
Check water pump; check
for
blockage in
system
Fill
with
proper coolant
Check
for
loose clamps and damaged
hoses
Table
2
STARTER
MOTOR
NO·
LOAD
SPECIFICATIONS
Model
3HM, 3HMF, 3HM35
All other models
At 850 rpm
all models
At 3400 rpm
3HM and 3HM35
At 3600 rpm
all models
except 3HM and 3HM35
Volts
12
12
Max.
amperage
90
60
Table
3
OIL
PRESSURE
50 kPa (7 psi)
300-400 kPa (43-58 psi)
300-400 kPa (43-58 psi)
Speed
(rpm)
4000 or higher
7000 or higher
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