Rocker Arm And Pushrod Replacement - GMC G Service Manual

6A4-6 SMALL BLOCK
REMOVAL — CARBURETED ENGINES
M Remove or Disconnect (Figure 3)
1. Battery negative cable.
2. Engine cover (G-models).
3. Air cleaner.
4. Crankcase ventilation hoses at the rocker arm
covers.
5. Wiring harnesses from the clips, and move aside.
6. Diverter valve with bracket and hoses.
7. AIR check valve.
8. Oil fill tube (right side cover).
9. Heat stove pipe (right side cover).
10. Components as follows for left rocker arm cover:
• Decel valve and bracket (G*models).
• Vacuum pipe from EFE valve.
• Power brake vacuum pipe, and move it aside.
• Air conditioning compressor rear brace (if
equipped).
11. Rocker arm cover nuts, reinforcements, and wire
clips.
12. Rocker arm cover and gasket.
CLEANING AND INSPECTION
Clean
• All traces of old gasket from the rocker arm cover and
cylinder head.
lL » |
Clean
• Rocker arm cover sealing surface for distortion.
Replace if necessary.
INSTALLATION — TBI ENGINES
H Install or Connect (Figure 3)
1. Rocker arm cover and new gasket.
2. Rocker arm cover bolts and washers.
H O Tighten
• Bolts to 10.2 N*m (90 in. lbs.).
3. AIR pipe at manifold (G-models).
4. Components as follows for left rocker arm cover:
• Air conditioning compressor (if equipped; R/V
models). Refer to AIR CONDITIONING
(SEC. 1B).
• Power brake vacuum pipe (R/V models).
• Oil fill tube (G-models).
• Generator rear brace (G-models).
5. Components as follows for right rocker arm cover:
• Heat stove pipe.
• Dipstick upper bracket (G-models).
• PCV valve.
• Diverter valve and hoses to bracket (G-models).
• AIR hose to check valve (G-models).
6. Wiring harnesses to the rocker arm clips.
7. Crankcase ventilation hoses at the rocker arm cover.
8. Air cleaner.
9. Engine cover (G-models).
10. Battery negative cable.
INSTALLATION — CARBURETED ENGINES
B
Install or Connect (Figure 3)
1. Rocker arm cover and new gasket.
2. Reinforcements, wire clips, nuts, and stud (if used).
H O Tighten
• Nuts to 7.3 N*m (65 in. lbs.).
3. Components as follows for left rocker arm cover:
• Air conditioning compressor rear brace (if
equipped).
• Power brake vacuum pipe.
• Vacuum pipe to EFE valve.
• Decel valve and bracket (G-models).
4. Heat stove pipe (right side cover).
5. Oil fill tube (right side cover).
6. AIR check valve.
7. Diverter valve, bracket, and hoses.
8. Wiring harnesses to the rocker arm clips.
9. Crankcase ventilation hoses at the rocker arm
covers.
10. Air cleaner.
11. Engine cover (G-models).
12. Battery negative cable.
ROCKER ARM AND PUSHROD
REPLACEMENT
B
Remove or Disconnect
1. Rocker arm cover. Refer to "Rocker Arm Cover
Replacement" in this section.
2. Rocker arm nut.
• If only the pushrod is to be replaced, back the
rocker arm nut off until the rocker arm can be
swung away from the pushrod. Then pull the
pushrod out.
3. Rocker arm with ball.
4. Pushrod.
] Important
• Set aside used components in order; they must be
reassembled in their original locations.
| y | Inspect
• Rocker arms and balls at their mating surfaces.
These surfaces should be smooth and free from scor­
ing or other damage.