Generac Power Systems NP-40G - Manual (Page 48)

Section 2.4- CRANKSHAFT AND CAMSHAFT
General
Prior to removal of the crankcase cover, gain access
to the engine and generator by removing surrounding
sheet metal as required. See Section 1.6.
Crankcase Cover Removal
Before attempting to remove the crankcase cover,
remove rust, paint and burrs from the power takeoff
K end of the crankshaft. This will reduce the possl-
of damaging the oil seal In the crankcase cover or
the bearing during cover removal.
To remove the crankcase cover, proceed as follows:
1. Drain oil from the crankcase.
2. Remove the et^lne cylinder head, push rods and push
rod guide plate. See Section 2.2.
3. Remove all bolts that retain the crankcase cover to the
crankcase.
4. Remove the crankcase cover. If necessary, tap lightly
with a soft hammer on alternate sides of the cover.
Camshaft Removal
See Figure 2. Remove the camshaft as follows:
1. Tip the engine over onto the flywheel end of the
crankshaft. Support the engine to prevent end of crank­
shaft from resting on the workbench.
2. Reach In with two fingers and hold the tappets up so
they are clear of the camshaft lobes. Then, remove the
camshaft.
3. Remove the two tappets.
4. Remove the outer and Inner oil pump rotors.
Crankshaft Removal
See Figure 3. To remove the crankshaft, proceed as
follows:
1. The engine flywheel must be removed before the
crankshaft can be removed.
2. The piston and connecting rod must be removed.
3. Remove the crankshaft by pulling It straight out of the
crankcase.
Camshaft Inspection
Carefully Inspect the entire camshaft for wear, nicks,
damage. All areas Indicated In Figure 4 should be
checked for wear.