Generac Power Systems 941-2 Service Manual page 43

NOTE: After the valve guides have been over-
sized, be sure to recut the valve seats so they will
align with the guides.
Figure 8. Valve Guides
VALVE TAPPETS:
Valve tappets can be removed during removal of the
engine camshaft. Intake and exhaust valve tappets
are identical. However, once a wear pattern has been
established the two tappets should not be
Interchanged.
Figure 10. Valve Tappet
VALVE SPRINGS:
Inspect the valve springs. Measure the spring free
length. Also, check the amount of force required to
compress the spring to a length of 1.39 inch (35.2
mm). Replace any damaged or defective spring.
Figure 10. Valve Spring
VALVE SPRING FREE LENGTH
GV-220: 2.0741inch (52.69mm)
FORCE REQUIRED TO COMPRESS SPRING TO 1.39
INCH (35.2MM)
GV-220:19.8-21.81lbs (9.0-9.9kg)
VALVE COMPONENTS INSTALLATION
After the valve train parts have been inspected and (if
necessary) serviced, install them as follows:
1. Lubricate the valve stems and the valve guides with engine oil.
2. Install the intake and exhaust valves through their respective
valve guides In the cylinder head.
a. The exhaust valve has the smaller head with a
diameter of 1.053 inches (26.75mm).
b. The intake valve has the larger head, having a
diameter of 1.171 inches (29.75mm).
c. Valve seat sizes in the cylinder head will match
their respective head sizes.
NOTE: The exhaust valve stem Is also smaller
than that of the Intake valve.
Figure 11. Installation of Intake and Exhaust Valves
Section 2.2
VALVE TRAIN
Page 2.2-3