Chevrolet 1991 Light Duty Truck Repair Manual page 407

20. Intake Valve
21. Exhaust Valve
22. Valve Keepers
23. Valve Cap
24. Oil Shedder
25. Seal
26. O-Rina
Figure 23— Valves and Components
ROCKER ARM STUD AND PUSHROD GUIDE
REPLACEMENT
The rocker arm studs are threaded into the cylinder
heads.
0
Remove or Disconnect (Figure 25)
1. Rocker arm studs (90) using a deep socket.
2. Pushrod guide (91).
0
Install or Connect
1. Pushrod guide (91).
2. Rocker arm studs (90) using a deep socket.
| ^ | Tighten
• Rocker arm studs to 65 N-m (48 ft. lbs.).
ASSEMBLY
0
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.
B9551
4. Oil shedder (24).
5. Caps (23).
6. O-ring seals (26) and valve keepers (22).
• Compress the valve spring using J 8062 (figure
24). Compress the spring enough so the lower
valve stem groove can be seen clearly.
• Push a new O-ring seal (26) onto the valve
stem. The seal is to be installed on the stem's
lower groove. Make sure the seal is flat and not
twisted.
Z 3 L V6 ENGINE 6A2-15