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Chapter 19 Engine Reassembly and Break-In
of the keyways when the crankshaft is installed.
Next, lubricate the crankshaft main bearing jour-
nals and timing gear with assembly lube and then
install the crankshaft. See Figure 19-4. Assembly
lube is a heavy oil that protects parts from wear
during initial start up. Install the crankshaft with
the tapered end positioned on the fl ywheel side of
the crankcase.
Next, position the engine so the valve lifters
can be installed in their guides without falling
out. Lubricate the lifters with assembly lube before
installing them. Be sure to install each lifter in the
proper guide. See Figure 19-5.
Lubricate the camshaft’s bearing journals,
cam lobes, and timing gear. Rotate the crankshaft
so the timing mark on the crankshaft is pointing
toward the lifters. Next, align the timing mark
on camshaft timing gear with the timing mark
on the crankshaft gear and install the camshaft,
Figure 19-6. If the engine is equipped with an oil
slinger or centrifugal governor gear, they should
be installed next. See Figure 19-7.
Installing the Piston and Rod
Assembly
Lubricate the piston pin with assembly lube.
Place the piston on the connecting rod. Refer to
the marks on the piston and the connecting rod to
Figure 19-3.
Valve spring with dampening coils.
(Tecumseh Products Co.)
Dampening coils
located closer
together
Figure 19-4.
Install the crankshaft carefully to avoid damaging
bearing surfaces and seals.
Figure 19-5.
Tilt the engine so the valve lifters will not fall out of
their guides.
Figure 19-6.
Lubricate the bearing journals and cam lobes and
align the timing marks before installing the camshaft.
Timing marks