Generac Power Systems 941-2 - Manual (Page 45)

Section 2.2
VALVE TRAIN
VALVE CLEARANCE GV-220 ENGINE
INTAKE VALVE: 0.001-0.0022 inch (0.03-0.056mm)
EXHAUST VALVE: 0.0018-0.003 inch (0.046-0.07mm)
Adjust the valve clearance as follows:
1. Rotate the crankshaft until the piston is at top dead center
(TDC) of its compression stroke. Both valves should be closed.
2. Loosen the rocker arm jam nut.
3. Use an alien wrench to turn the pivot ball stud while checking
the clearance between the rocker arm and the valve stem with
a feeler gauge.
Figure 16. Adjusting Valve Clearance
4. When valve clearance is correct, hold the pivot ball stud with
the alien wrench while tightening the rocker arm jam nut with a
crow's foot. Tighten the jam nut to the specified torque. After
tightening the jam nut, recheck the valve clearance to make
sure it did not change.
JAM NUT TIGHTENING TORQUE
GV-220: 6.3 foot-pounds
Figure 17. Tightening Pivot Ball Jam Nut
Figure 18. Rocker Arm Cover Installation
ROCKER ARM COVER INSTALLATION
Place a new rocker arm cover gasket into place.
Then, install the rocker arm cover. Finally, retain the
cover with M6-1.00 x 12mm screws.
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