Service manual
ENGINE
TROUBLESHOOTING
PROBLEM
PROBABLE
CAUSE
VERIFICATION/REMEDY
LOW
OUTPUT
(cont.)
OVERHEATING
1.
Low
coolant
level.
1.
Add
coolant.
2.
Loose
V-belt.
2.
Adjust
or
replace
V-belt.
3.
Incorrect
injection
timing.
3.
Adjust
injection
timing.
4.
Low
engine
oillevel.
6.
Add
engine
oil.
EXCESSIVE
OIL
OIL
LEAKAGE
CONSUMPTION
1.
Defective
oil
seals.
1.
Replace
oil
seals.
2.
Broken
gear
case
gasket.
2.
Replace
gasket.
3.
Loose
gear
case
attaching
bolts.
3.
Retighten
bolts.
4.
Loose
drain
hose
attachment.
4.
Retighten
banjo
bolt
and
secure.
5.
Loose
oil
pipe
connector.
5.
Retighten
oil
connections.
6.
Broken
rocker
cover
gasket.
6.
Replace
gasket.
7.
Loose
rocker
cover
attaching
bolts.
7.
Retighten
attaching
bolts.
OIL
LEVEL
RISING
1.
Dead
cylinder,.
1.
Check
compression.
2.
Displaced
or
twisted
connecting
rod.
2.
Replace
connecting
rod.
3.
Worn
piston
ring.
3.
Replace
ring.
4.
Worn
piston
or
cylinder.
4.
Replace
piston
and
rebore
cylinder.
OIL
LEVEL
FALLING
1.
Defective
valve
stem
seal.
1.
Replace
valve
stem
seal.
2.
Worn
valve
and
valve
guide.
4.
Replace
a
valve
and
valve
guide.
EXCESSIVE
FUEL
ENGINE
BODY
TROUBLES
CONSUMPTION
1.
Noisy
knocking.
1.
See
KNOCKING.
2.
Smoky
exhaust.
2.
See
SMOKY
EXHAUST.
3.
Moving
parts
nearly
seized
or
excessively
worn.
3.
Repair
or
replace.
4.
Poor
compression.
4.
See
LOW
COMPRESSION;
HARD
STARTING.
5.
Improper
valve
timing.
5.
Adjust.
6.
Improper
valve
clearance.
6.
Adjust.
INSUFFICIENT
INTAKE
AIR
1.
Air
intake
obstructed.
1.
Remove
obstruction.
NOZZLE
TROUBLES
1.
Seized
nozzle.
1.
Replace.
2.
Worn
nozzle.
2.
Replace.
IMPROPER
FUEL
Replace
with
proper
fuel.
FUEL
LEAKS
Find
fuel
leaks.
SMOKY
EXHAUST
WHITISH
OR
PURPLISH
1.
Excessive
engine
oil.
1.
Correct
oil
level.
2.
Excessive
rise
of
oil
into
combustion
chamber.
a.
Poor
piston
contact.
a.
Check.
b.
Seized
piston
ring.
b.
Replace
or
clean.
c.
Excessive
piston-to-cylinder
clearance.
c.
Replace
or
correct.
(continued)
Engines
& Generators
4