Generac Power Systems GTV-990 User Manual

5-1
SECTION 5: CYLINDER HEAD AND VALVES
SECTION CONTENTS
PAGE
GENERAL INFORMATION ............................................... 5-1
REMOVE CYLINDER HEADS............................................ 5-1
Remove Rocker Arms ................................................ 5-2
DISASSEMBLE CYLINDER HEAD...................................... 5-2
INSPECT AND REPAIR .................................................... 5-3
Reface Valves and Seats ............................................ 5-3
ASSEMBLE CYLINDER HEAD .......................................... 5-4
INSTALL CYLINDER HEAD .............................................. 5-5
ADJUST VALVE CLEARANCE .......................................... 5-5
REASSEMBLE ................................................................ 5-5
STATIC GOVERNOR ADJUSTMENT.................................. 5-6
GENERAL INFORMATION
Compression testing information and procedures is described
in “Troubleshooting” in Section 1.
Cylinders are numbered as shown in Figure 5-1.
Figure 5-1.
REMOVE CYLINDER HEADS
Disconnect exhaust system from exhaust manifold. Remove
exhaust manifold 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.
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.

Generac Power Systems GTV-990 Specifications

General

Brand	Generac Power Systems
Model	GTV-990
Category	Engine
Language	English