GMC 1989 Light Duty Truck Repair Manual page 409

20. In ta ke Valve
21. E xh a u st Valve
22. Valve K eepers
23. Valve Cap
24. O il S h e d d e r
25. Seal
26. O -R ing
Figure 23— Valves and Components
Figure 2 4 — C om pressing th e Valve Springs
B-09551
• Valve guide reaming.
ROCKER ARM STUD AND PUSHROD
GUIDE REPLACEMENT
The rocker arm studs are threaded in place.
R em ove or D isconnect (Figure 25)
1. Rocker arm studs (90) using a deep socket.
2. Pushrod guide (91).
Install or C onnect
1. Pushrod guide (91).
2. Rocker arm studs (90) using a deep socket.
•
ASSEMBLY
Install or C onnect (Figures 23 and 24)
Tool Required:
1. Valves (20 and 21).
• Lubricate the valve stems with engine oil.
• Insert the valves into the proper seats.
2. Seals (25) (intake only).
• Install the seals over the valve stems and seat
them against the head.
3. Springs.
4. Oil shedder (24).
5. Caps (23).
6. O-ring seals (26) and valve keepers (22).
2.8 LITER V-6 6A2-17
Tighten
Rocker arm studs to 65 N-m (48 ft. lbs.).
J 8062, Valve Spring Compressor