Hydraulic Lifter Replacement - GMC G Service Manual

M Install or Connect
1. Pushrod cover and new gasket.
2. Pushrod cover bolts.
H X l Tighten
• Pushrod cover bolts to 9.0 N*m (80 in. lbs.).
3. Distributor. Refer to ENGINE ELECTRICAL (SEC.
6D).
4. Dipstick tube.
5. Negative battery cable.
HYDRAULIC LIFTER
REPLACEMENT
H Remove or Disconnect (Figures 8 and 9)
Tools Required:
J 3049 Hydraulic Lifter Remover (Plier Type) or
J 9290-01 Hydraulic Lifter Remover (Slide
Hammer Type)
1. Rocker arm cover, pushrod cover, and pushrod.
Refer to "PUSHROD COVER REPLACEMENT" in
this section.
2. Hydraulic lifters.
• Remove the hydraulic lifters one at a time and
place them in an organizer rack. The lifters must
be installed in the same bore from which they
were removed.
• A stuck hydraulic lifter can be removed using
J 3049 (figure 8) or J 9290-01 (figure 9).
Inspect
• Hydraulic lifter body for scuffing and scoring. If the
lifter body wall is worn or damaged, the mating bore in
the block should also be checked.
• Check the fit of each hydraulic lifter in its mating bore
in the block. If the clearance seems excessive, try a
new lifter.
• The hydraulic lifter foot must be smooth and slightly
convex. If worn, pitted, or damaged, the mating cam­
shaft lobe should also be checked.
Hydraulic Lifter Repair
• Refer to the proper Unit Repair Manual.
4.8 LITER L6 6A7-7
Figure 9 — Removing The Hydraulic Lifter