Assemble Cylinder Head - Generac Power Systems GTV99O Service Manual

SECTION 5: CYLINDER HEAD AND VALVES
2. nndllvalves
(Figure 5- 14).
Note: Lightly coat valve stems with oil or Sped'a Lube
Red beforc insta ing valves. Be surc lub cant is noton
valve fa.e, seat or end of valve sten.
Figurc 5"11. Measurc Valve SteI, Dianetel
5. Check valve springs for free lenqth (Figure 5-12).
Replace lf free length s ess than 36.5 mm (1.437 lnchet.
Figurc 5-14. lnstall Valves
Place a shop rag or shod section oi rubber fue ne under
valves ins de cornbustion chamber to hod va ve in place
while compressing sp.ing.
lnna I va ve springs and valve sprinq retalners over valve
Figure 5-12. Check Valve Spings
ASSEMBLE CYLINDER HEAD
l.lnstall newvalv€ stem seals.
a. Oi inner surface and lip ofvi ve stem seal.
b. Pressrealonto intake va lve guide bushing unlll tbottoms
(Figure 513)
5. Compress valve sprlng and instal keepeB (Flgure 5 15).
Figurc 5-1 5. Conptess valve spring and insta keeperc
6. Repeat procedure for oiher valves.
5-4
Figure 5-13, lnstall valve Sten Seals