Engine - Engine and crankcase
Engine - Troubleshooting
NOTE:
The following table lists problems and their possible causes with recommended remedial action.
ATTENTION:
When attending a repair the cause of the problem must also be investigated and corrected to avoid
repeat failures.
Problem
Possible Cause
Correction
Engine does not develop
full power
Clogged air cleaner
Clean or renew element
Fuel line obstructed
Clean
Faulty injectors
Clean and reset
Incorrect valve clearance adjustment
Clean and reset
Burnt, worn or sticking valves
Replace valves with new or oversize,
and/or machine the valve guide bores
Blown head gasket
Check head flatness and fit new gasket
Incorrect fuel delivery
Check injectors and pump
Low cylinder compression
Renew piston rings or re-bore/re-sleeve as
necessary
Oil pressure warning light
fails to operate
Bulb burnt out
Renew bulb
Warning Light pressure switch faulty
Renew pressure switch
Warning light circuit faulty
Check and renew wiring
Excessive exhaust smoke
Exhaust leak on exhaust manifold
Fit new gasket
Air cleaner dirty or restricted
Clean
Excessive fuel delivery
Overall injection pump and injectors
Engine knocks
Diluted or thin oil
Check crankshaft bearings for damage,
change as required. Drain and refill with
specified oil and renew filter.
Ascertain
cause of dilution
Insufficient oil supply
Check oil level and top up as necessary.
Overhaul or renew pump as necessary.
Check oil filter is not clogged
Low oil pressure
Overhaul pump or relief valve as necessary
Excessive crankshaft end play
Replace thrust washer
Excessive connecting rod or main
Install new bearing inserts and/or bearing
clearance re-grind crankshaft
Bent or twisted connecting rods
Renew connecting rods
Crankshaft journals out of round
Re-grind crankshaft and fit undersize bear-
ing inserts
Excessive piston to cylinder
Re-bore/re-sleeve block and fit i bore clear-
ance new pistons
Excessive piston ring clearance
Fit new pistons and rings
Broken rings
Fit new rings, check bore and pistons for
damage
Excessive piston pin clearance
Fit new piston or pin
Piston pin retainer loose or missing
Install new retainer, and check bore/pistons
for damage
Excessive camshaft play
Install new thrust plate
Imperfections on timing gear teeth
Renew timing gear
Excessive timing gear backlash
Check and adjust backlash /renew, timing
gear
Engine overheats
Coolant hose connection leaking or col-
lapsed
Tighten hose connection, renew hose if
damaged
Radiator cap defective or not sealing
Renew radiator cap
Radiator leakage
Repair/renew radiator
Improper fan belt adjustment
Re-adjust fan belt
Radiator fins restricted
Clean with compressed air
Faulty thermostat
Renew thermostat
Internal engine leakage
Check for source of leakage. Renew gas-
ket or defective parts
Water pump faulty
Overhaul water pump
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Summary of Contents for B80B
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