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AC3 Series of Engines
60
6. Install the valve springs and keepers:
6a. Place the spring over the valve stem.
6b. Set the valve keeper on top of the spring.
6c. While holding the valve in place, press down
on the keeper with two fingers and slide it into
the notch on the valve stem. See Figure 8.18.
7. Install the piston rings on the piston so that the let-
tering on the rings are facing the top of the piston
and the piston ring gaps are 180
o
away from each
other in line with the piston pin.
7a. The top piston ring is convex.
7b. The middle ring is tapered.
7c. The third ring is a 3-piece oil ring.
8. Attach the piston to the connecting rod by inserting
the piston pin.
NOTE: The piston pin will only slide in from one
side. After sliding the piston pin in, insert the
plastic cap.
9. Pre-lube the piston and cylinder wall with 10w30
motor oil.
10. Place the cylinder O-ring on the crankcase.
11. Compress the piston rings and slide the cylinder
over the piston just enough to cover the piston rings.
See Figure 8.20.
Figure 8.18
Keeper
Figure 8.19
Lettering must face up
Figure 8.20
Piston skirt still showing