New Holland 40 Series Repair Manual page 22

- - - - - - - - - - - PART 1 - ENGINE SYSTEMS - - - - - - - - - - -
The engine overhaul procedure initially de- 5. Oil pan and gasket.
scribes the assembly process for rebuilding
an engine using all new components. Follow-
ing this section are defined headings which
describe detailed repair specifications and
procedures, where components are suitable
tor re-use.
Where overhaul of components is required
without engine being removed from the trac-
tor refer to the following headings and the
relevant paragraphs in the main overhaul
procedure.
Operations or repairs that can be
performed with the engine still · In the
tractor.
1. Cylinder head and associated inlet and
exhaust components.
2. Fuel injection pump and related parts.
3. Water pump, thermostat and associated
components.
4. Oil pump relief valve.
6. Turbocharger.
Operations or repairs that can be
performed with the engine separated from
the front axle.
1. Front timing cover/timing gear removal.
2. Oil pan removal tor access to crankshaft
and balancer, bearing shells, piston re-
moval and oil pump suction tubing.
3. Front pulley and damper assembly.
Operations or repairs that can be
performed with the engine separated from
the transmission housing and with oil pan
removed.
1. Crankshaft rear oil seal and carrier re-
moval (with oil pan removed).
2. Oil pump and drive gear removal.
B. FAULT FINDING
IMPORT ANT: When effecting a repair the
cause of the problem must be investigated
and corrected to avoid repeat failures.
The following table lists problems and their
possible causes with recommended remedial
action.
PROBLEM
Engine does not-
develop full power
POSSIBLE CAUSES REMEDY
1. Clogged air cleaner 1 . Clean or renew element
2. Fuel line obstructed 2. Clean
3. Faulty injectors
3. Clean and reset
4. Incorrect valve lash 4. Check and reset
adjustment
5. Burnt, worn or sticking
valves
6. Blown head gasket
7. Incorrect fuel delivery
5. Replace valves with new or
oversize and/or machine
the valve guide bores
6. Check head flatness and fit
new gasket
7. Check injectors and pump
8. Low cylinder compression 8. Renew piston rings or
re-bore/re-sleeve as
necessary
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