Generac Power Systems GTH990 User Manual

5-1
SECTION 5: CYLINDER HEAD AND VALVES
GENERAL INFORMATION
Compression testing information and procedures is described in Sec-
tion 1, under “Troubleshooting”.
Cylinders are numbered as shown in Figure 5-1.
Note: Cylinder #1 is closest to the flywheel.
Figure 5-1.
REMOVE CYLINDER HEADS
Remove exhaust system from engine. Disconnect choke and throttle
control cables. Remove spark plugs.
1. Remove the parts depicted in Figure 5-2.
a. Discard gaskets and valve cover seals.
REMOVE ROCKER ARMS:
1. Unlock jam nuts and remove two ball studs and rocker arm
assemblies (see Figure 5-3).
2. Remove push rods and identify each.
Note: Push rods develop a wear pattern. Mixing them from side to
side can increase this wear, leading to more frequent adjustments
and or loss of performance.
1
2
5
7
6
3
4
1
2
3
4
5
6
7
8
8
VALVE
CO
VE
R
L
O
WER WRAPPE
R
U
PPER WRAPPE
R
BL
O
WER H
OUS
IN
G
O
IL
COO
LE
R
INTAKE MANIF
O
LD
A
SS
EMBL
Y
R
O
TATIN
G
SC
REE
N
FIN
G
ER
GU
AR
D
Figure 5-2.
5

Generac Power Systems GTH990 Specifications

General

Brand	Generac Power Systems
Model	GTH990
Category	Engine
Language	English