New Holland B80B, Service Manual

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