Chapter 5: Lubrication
53
The second oil passage runs along the bottom side of
the cylinder. This is the oil return passage. As the name
implies, it allows the oil collecting in the cylinder head
to return to the sump. The return passage can be iden-
tified by the plastic drain tube that is attached to it,
inside of the engine. See Figure 5.7.
NOTE: Not all engine have this drain tube.
NOTE: Because these engines use splash lubri-
cation, the type of oil and the oil level is critical
for proper operation of the engine. If the oil level
is too low, the paddles on the governor gear can
not splash the oil into the engine. If the oil level is
too high, the oil will not change into a mist to
reach the upper side of the engine.
Figure 5.7
Drain tube
PCV
The PCV valve is located under the flywheel and
allows the crankcase pressure to escape. The function
and test procedures for the PCV is covered in Chapter
2: Basic Troubleshooting.
To service the PCV:
1. Remove the flywheel by following the steps
described in the Chapter 7: Ignition System.
2. Remove the two screws that hold the PCV
chamber cover to the engine block using a
10mm wrench. See Figure 5.8.
Figure 5.8
PCV tube
PCV
chamber
cover
Dimple
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