TROUBLE SHOOTING
SYMPTOMS POSSIBLE CAUSE
1. Difficulty starting a. Incorrect grade of fuel or oil
b. No fuel in tank
c. Choked fuel or oil filter
d. Air lock in the fuel system
e. Injector nozzle valve stuck open
f. Fuel pump delivery valve scored
g. Stocking fuel pump rack
h. Stop/start lever in the wrong position
i. Retarded injection
j. Injector loose in the cylinder head
k. Leaking valves
l. Sticking piston rings
m. Exhaust valve sticking
n. Worn cylinder
o. Incorrect decompressor clearance
p. Load not disconnected
q. Battery not serviceable
r. Faulty or loose electrical connections
s. Blown fuse
t. Bad oil temperature switch
u. Bad air temperature switch
v. Relay (CR2) malfunction
2. Knocking a. Valve, probably exhaust, sticking in guide and touching the piston
b. Worn connecting rod bush or bearing
c. Worn gudgeon pin or small end bearing
d. Insufficient clearance between the piston and cylinder head
e. Injection too early
f. Flywheel coupling or pulley loose
g. Excessive camshaft or crankshaft end play
h. Excessive carbon deposits on the pistons
i. Excessive clearance between the piston and cylinder
j. Engine loose on its mountings
k. Wrong type of fuel
l. Flywheel loose
3. Excessive a. Choked air filter
Carbon b. Choked exhaust system
Deposits c. Unsuitable fuel or lubricating oil
d. Continuous idling
e. Defective injector spraying
f. Late injection of fuel
g. Low load running
h. Low temperature running
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