New Holland B80B Service Manual page 43

Problem
Water temperature gauge
fails to reach normal
operating temperature
Low oil pressure
Excessive oil
consumption
Engine - Engine and crankcase
Possible Cause
Exhaust gas leakage into cooling
Coolant aeration
Cylinder head gasket improperly installed Renew cylinder head gasket installed
Hot spot due to rust and scale or clogged
water jackets
Obstruction to radiator air flow
Extended engine idling
Oil cooler tube blocked
Radiator core tubes blocked
Faulty temperature sender
Incorrect or faulty thermostat
Faulty water temperature gauge
Engine oil level low
Wrong grade of oil
Blocked oil pump sump screen
Oil pressure relief valve faulty
Oil pump worn
Excessive oil pump rotor and shaft assem-
bly clearance
Excessive main or connecting rod bearing
clearance
Engine oil level too high
External oil leaks
Worn valves, valve guides or bores
Cylinder head gasket leaking
Oil loss past the pistons and rings
Oil cooler leak
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10.1 [10.001] / 10
Correction
Renew cylinder head gasket
Tighten all connections and check coolant
level is correct. Ensure cylinder head gas-
ket has not blown
Reverse flush entire clogged water
Remove the obstruction
Do not allow engine to idle for long periods
Clean
Check free flow
Renew sender switch
Renew thermostat
Renew temperature gauge
Top up, as necessary
Drain and refill with correct grade of oil
Clean pump screen
Fit new relief valve
Renew oil pump
Overhaul pump
Install new bearings inserts and bearing
clearance or re-grind crankshaft if neces-
sary
Reduce oil level
Renew gaskets and seals, where neces-
sary. Check mating surfaces for damage
or distortion
Renew
Renew gasket. Check head for damage or
distortion
Renew rings and/or re-bore/re-sleeve block
as necessary
Repair/renew oil cooler assembly