LUBRICATION
39
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 is the
tiny hole that is in between the two tappet passages.
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 dipper on the connecting rod 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.
Positive crankcase ventilation valve
The PCV valve is located inside the valve cover.
The function and test procedures for the PCV valve is
covered in Chapter 2: Basic Troubleshooting.
To remove the valve cover and PCV valve:
1. Disconnect and ground the spark plug wire.
2. Squeeze the spring clamp that secures the
breather hose to the valve cover nipple and slide
it back. Then remove the breather hose from the
valve cover nipple.
See Figure 5.6.
3. Remove the five screws that hold the valve
cover to the cylinder head using a 10mm
wrench.
See Figure 5.7.
Figure 5.6
Breather hose
Clamp
Figure 5.7
Remove these
screws
To Next Page
Loading...
Need help?
General
