Generac Power Systems 941-2 - Manual (Page 44)

Section 2.2
VALVE TRAIN
VALVE COMPONENTS INSTALLATION
(CONTINUED)
3. Install the valve spring washers, valve springs and valve spring
retainers over the valve guides.
a. Hold the valve with your fingers and use your
thumbs to compress the spring.
b. When the spring is compressed sufficiently,
slide the spring retainer small opening over the
valve stem.
c. With the smaller retainer opening around the
valve stem, release the spring.
Figure 12. Installing Valve Spring Washers
4. After both valves have been retained in the cylinder head, posi-
tion a new head gasket and install the cylinder head.
NOTE: The head gasket is coated with a special
substance for beer sealing. The gasket must be
free of nicks, scratches and other defects for bet-
ter sealing.
5. Install cylinder head bolts. Tighten the head bolts in the
sequence shown to the recommended tightness.
TIGHTENING TORQUE
CYLINDER HEAD
GV-220: 29 foot-pounds
Figure 13. Head Bolts Tightening Sequence
6. Place the push rod guide plate into position on the head. Then,
install the rocker arm and the pivot ball stud. The rocker arm
jam nut must be on far enough to hold the guide plate In posi-
tion.
NOTE: Do NOT adjust valve clearance at this time.
This will be done later.
Figure 14. Install Rocker Arm & Pivot Ball stud
7. install the push rod with either end against the tappet.
a. Place the push rod between the guide plate
tabs.
b. Place the rocker arm socket onto end of push
rod.
c. Alignment is correct when push rod ball rests In
the rocker arm socket.
NOTE: The pivot ball stud will be tightened when
the valve clearance Is adjusted. After valve clear-
ance has been adjusted, the rocker arm cover will
be Installed.
Figure 15. Push Rod Installation
ADJUSTING VALVE CLEARANCE
When adjusting valve clearance, the engine should
be at room temperature and the piston should be at
top dead center (TDC) of Its compression stroke
(both valves closed).
Page 2.2-4