MANIFOLDS: Detach automatic choke if manifold mounted type then remove exhaust manifold and
Intake manifold.
CYLINDER HEAD: Remove thermostat housing,
thermostat, spark plugs then remove cylinder head
bolts and head. Discard head gasket.
VALVES: Remove valve cover,
then using s+ing compressor tool,
compress springs to remove
keepers then remove valve springs and valves--
tag valves with cylinder number and do not mix valve
parts as they are removed.
If re-usable, these parts should be reinstalled in the same place as
removed.
Tappets cannot be removed until after the camshaft is removed.
GENERATOR SUPPORT: Remove five capscrews securing support to crankcase. Rear oil seal and
retatner or trough will be removed along with generator support.
WATER PUMP: Remove four capscrews and detach water pump (with fan attached) from flange at front
of crankcase.
GEAR COVER - GEARS: After removing crankjaw and belt drive pulley, remove capscrews around
outer edges and on bottom flange of gear cover then separate cover from front support plate.
Discard
gasket. Slide front oil slinger off crankshaft then place block of wood between gear teeth to hold gears
white the camshaft nut and cam gear are removed.
The crank gear does not have to be removed in
‘order to remove front support plate.
FIGURE 9-6 --
REMOVING CRANKSHAFT
I
FIGURE 9-7 --
REMOVING CAMSllAtl
The idler gear rides on an anti-friction bearing which is,
in turn, press fitted on a stub shaft in
the gear cover. If the gear spins freely without any evidence of binding, etc., the ball bearing does not
have to be replaced. To replace -bearing,
remove snap ring then slip gear off. Bearing is press fitted
on shaft. Use press tb remove and to reinstall new bearing.
CRANKCASE - OIL PAN BASE: Remove all oil pan to crankcase capscrews then carefully separate
crankcase from base--tilt crankcase sideways off base to avoid damaging oil pick up screen.
OIL PUMP: Remove capscrews securing flanged portion of oil pump to the pa-side crankcase.
Turn
pump body from side to side as the gear extension is pulled free of bored alignment’holes as these are
closely fitted.
CRANKSHAFT: Remove safety wiring,
remove capscrews then disconnect main and rod bearing caps
trom Journals and crankpins--
temporarily reinstall e.ach rod cap on the connecting rod from which it was
removed.
Carefully lift crankshaft out of crankcase.
PISTONS - CONNECTING RODS: After cranksha.ft is removed, the piston - rod assemblies can be
removed through bottom of cylinder bore i.n crankcase.
If taken out through the top, a ridge reamer
may have to be used to remove ridge created at the top of the cylinder.
CAMSHAFT: If cam gear is not worn or damaged,
it does not have to be removed from camshaft.
Push
tappets away from camshaft then carefully guide camshaft out through front or gear end of block.
Rem&e tappets through inside of crankcase after camshaft is removed--
tag or mark tappets according
to cylinder number.
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