New Holland B80B Service Manual page 42

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