Section 6: Cylinder Head And Valves - Generac Power Systems OHVI GSH 220 Service Manual

MAjor CoMPoNeNTS
Valve train components are shown in Figure 6- below.
8
7
9
6
5
4
3
ITEM QTY DESCRIPTION
1 2 Tappet
2 2 Push Rod
3 1 Push Rod Guide Plate
4 2 Rocker Arm Jam Nut
5 2 Rocker Arm
6 2 Pivot Ball Stud
7 4 Valve Spring Keeper
8 2 Valve Spring Retainer
9 2 Valve Spring
10 2 Wear Washer
11 1 Intake Valve Stem Seal
12 1 Exhaust Valve
13 1 Intake Valve
Figure 6-1. Valve Train Components
REMOVE ROCKER ARM
COVER SCREWS
Figure 6-2. Removal of Rocker Arm Cover
10
11
12
13
2
1

SeCTIoN 6: CYlINder HeAd ANd vAlveS

dISASSeMblY
. Remove the oil breather tube. Remove the four M6-.00
x 2mm screws. Then, remove the rocker arm cover (see
Figure 6-2).
NOTE: Whenever the rocker arm cover is removed, the
cover gasket must be replaced to ensure a proper seal.
2. Loosen the rocker arm jam nuts on the pivot ball studs.
Then, loosen the pivot ball studs. Remove the two pivot
ball studs, rocker arms and jam nuts. Also, remove the
push rod guide plate.
NOTE: Always keep intake and exhaust valve parts sepa-
rated. Intake and exhaust pivot ball studs, rocker arms
and push rods are identical. However, the wear patterns
will be different.
ROCKER ARMS
PIVOT BALL
STUDS
PUSH ROD
GUIDE PLATE
Figure 6-3. Rocker Arms, Pivot Ball Studs, Push Rods and
Push Rod Plate
. Remove the push rods (see Figure 6-).
. Remove the cylinder head bolts, then the cylinder head
and cylinder head gasket (see Figure 6-).
CYLINDER
HEAD BOLT
CYLINDER
HEAD GASKET
Figure 6-4. Cylinder Head Removal
6-
PUSH RODS
CYLINDER
HEAD
CRANKCASE
6