GMC 1990 Light Truck Repair Manual page 427

20
20. Intake Valve
21. Exhaust Valve
22. Valve Keepers
23. Valve Cap
24. Oil Shedder
25. Seal
26. O-Ring
Figure 23—Valves and Components
Figure 24—Compressing the Valve Springs
90. Rocker Arm Stud
91. Pushrod Guide
B-09551
• Valve guide reaming.
ROCKER ARM STUD AND PUSHROD
GUIDE REPLACEMENT
The rocker arm studs are threaded in place.
Remove or Disconnect (Figure 25)
1. Rocker arm studs (90) using a deep socket.
2. Pushrod guide (91).
+4-
Install or Connect
1. Pushrod guide (91).
2. Rocker arm studs (90) using a deep socket.
S t Tighten
•
ASSEMBLY
+«-
Install or Connect (Figures 23 and 24)
Tool Required:
J 8062, Valve Spring Compressor
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
Figure 25—Rocker Arm Studs
Rocker arm studs to 65 N m (48 ft. lbs.).
6A2-17
-6
B-09444