Generac Power Systems GTV99O Service Manual page 30

SECTION 5: CYLINDER HEAD AND VALVES
Note: Ma* components so that they may be rcassem-
bled in theh ofiginal position.
RE\,IOVE
ROCKER ARN,45:
1. Ljnlockjam nutsand rcmovetwo ballstuds and rocker arm
assembJiet(see
Figure 5-3).
2. Remove push rods and identify each.
Note: The valve push rods arc aluminum, Matk push
rods for identification to Nevent interchanging.
,/
BALL STUD
6tr
,FOCKEB AR/\,l
,xa;g JAM NU'r
Figure S-3.
3. Remove head bolts and cylinder head (Figure 5-4).
a. Discard gasket.
4. Repeat Steps 1-3 for other cylinder head.
DISASSEMBTE
CYLINDER HEADS
I Piace a shop rag orshort section of rubberfuelline under
valves inside combunion chamber to hold valve in ptace
while conrpressing
sprlng.
2. lold down valve spr ng retainer by hand or with a vatve
spflng compressor (Figure 5-5). Remove the following:
a. Valve spring keepers
b.Valve spring retalner
c. V:lve sprlng
d.lN and EX valves
3. Remove and discard valve stem seals (Frgure 5,6).
Figurc 5-5. Renoving Retaine9
Figurc 5-4. henove Cylindet Head
Figute ,6. Rei/loving Valve Sten Seals