Hydraulic Lifter Replacement - GMC G Service Manual

34. Rocker Arm Retainers
Figure 6 — Removing the Rocker Arm Retainers
h H install or Connect (Figures 5 and 7)
1. Rocker arms to the rocker arm shaft. One type of
rocker arm is used at all locations.
] Important
• Lubricate the rocker arms with engine oil before
installing.
2. New rocker arm retainers.
• Center the rocker arms on the corresponding
holes in the rocker arm shaft.
• Use a drift of at least 13 mm (1/2-inch)
diameter.
NOTICE: The pushrods must be installed with
the marked or painted end up. Failure to do so
may result in damage or premature wear.
3. Pushrods, with the painted or marked end up.
4. Rocker arm shaft assembly. Make sure the ball ends
of the pushrods seat in the rocker arms.
NOTICE: Improper installation of the rocker arm
shaft bolts may cause rocker arm shaft break­
age and/or piston-to-valve contact.
5. Rocker arm shaft bolts.
Figure 5 — Valve Train Components
B-08026
6. Rocker arm cover. Refer to "Rocker Arm Cover
E
1. Rocker arm covers. Refer to "Rocker Arm Cover
2. Rocker arm shaft with rocker arms and pushrods.
3. Cylinder head (G-models). Refer to "Cylinder Head
4. Clamps (32).
5. Guide plates (33). Use mechanical fingers, if
6.2L DIESEL 6A6-7
• Rotate the engine until the mark on the torsional
damper aligns with the "0" mark on the timing
tab.
• Rotate the engine counterclockwise 88 mm (3
1 /2-inches), measured at the torsional damper.
This measurement can be estimated by aligning
the torsional damper mark with the first lower
water pump bolt (figure 7). This procedure will
position the engine so no valves are close to a
piston crown.
• Install both bolts snug on the shaft.
I ^ l Tighten
• Bolts alternately to 55 N*m (40 ft. lbs.).
Replacement" in this section.
HYDRAULIC LIFTER
REPLACEMENT
Remove or Disconnect (Figures 5 and 8)
Tool Required:
J 29834 Hydraulic Lifter Remover
Replacement" in this section.
Refer to "Rocker Arm, Shaft, and Pushrod Replace­
ment" in this section.
] Important
• Rocker arm assemblies and pushrods must be
marked for proper assembly, as outlined
previously.
Replacement" in this section.
necessary.