Generac 86640 User Manual download pdf (Page 37)

Cylinder Head Assembly (Continued)

6. Install oil pump Idler gear and oil pump regulator spring.

Make sure the spring faces in the proper direction.

Figure 41.

Oil pump spring stopper

Oil pump regulator spring ^

Oil pump drive gear

Installation

1. Set No. 1 cylinder head at top dead center (TDC) of its

compression stroke by first aligning the CAMSHAFTTIMING

PULLEY MARK with mark on the main bearing cap.

CAUTION: DO NOT rotate crankshaft and cam

shaft separately or valves will hit the piston heads.

2. Install cylinder head with a new gasket. The following rules

apply:

D Always use a new cylinder head gasket.

D Before tightening the cylinder head bolts, check that the

oil pump drive gear can be turned freely by hand.

D Always installwashers between bolts and head.

D Tighten cylinder head bolts in the sequence shown in

Figure 43.

3. Tighten cylinder head bolts as follows:

a. First, tighten all bolts to 22 foot-pounds (29 N-m).

b. Then, tighten all bolts to 47 foot-pounds (64 N-m).

c. Loosen all bolts completely.

d. Tighten all bolts to 22 foot-pounds (29 N-m).

e. Tighten all bolts to 47-51 foot-pounds (64-69 N-m).

NOTE: When RETORQUING cylinder head bolts for nor

mal periodic maintenance, first loosen all bolts slightly.

Then (with engine COLD), tighten all bolts In correct

sequence to 47-51 foot-pounds (64-69 N-m).

4. Install timing belt. Install oil pump Idler and oil pump

regulator spring (make sure spring direction is correct). Install

upper dust cover, making sure its gasket mates with cylinder

head properly.

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Generac 86640 User Manual Page 37