Generac Power Systems NP-40G - Manual (Page 38)

Section 2.2- VALVE TRAIN
Valve Train Components
Valve train components are listed below and shown In
Rgure 1, below.
ITEM QTY DESCRIPTION
1
2
2
2
Tappet
Push Rod
3 2 Rocker Arm
4 2 Pivot Ball Stud
5 2 Rocker Arm Jam Nut
6 1 Push Rod Guide Plate
7 2 Valve Spring
8 2 Valve Spring Retainer
9 2 Valve Spring Washer
Exhaust Valve 10 1
11 1 Intake Valve
Valve Components Removal
1. The ROCKER ARM COVER Is retained by four M6-1.00
X 12mm screws and lockwashers. Remove the four
screws and lockwashers, then remove the ROCKER ARM
COVER and Its gasket
NOTE: Replace the ROCKER ARM COVER GASKET
each time the COVER Is removed, to ensure proper
sealing.
2.
Loosen the rocker arm Jam nuts on the pivot ball studs.
Then, loosen the pivot ball studs. Remove the two pivot
ball studs, the rocker arms and the Jam nuts. Also remove
the push rod guide plate.
NOTE: Keep the Intake valve and exhaust valve
parts separated. Intake and exhaust parts are Iden­
tical. However, once a wear pattern has been estab­
lished on these parts their tit will be different.
3. Remove the push rods.
4. Remove the cylinder head bolts, then remove the
cylinder head and head gasket
NOTE: Replace the head gasket every time the head
Is removed. The new head gasket must be free of
nicks and scratches as these could cause leakage.
Figure 4. Cylinder Head Removal
CYLINDER
HEAD
CRANKCASE
CYUNDER
HEAD
BOLTS
HEAD
GASKET
DANGERI
ALWAYS WEAR SAFETY GLASSES WHEN RE­
MOVING THE VALVE SPRINGS.
5. See Figure 5, next page. Hold the valve with your
fingers while compressing the spring with your thumb,
then proceed as follows:
Page 2.2-1