GMC G Service Manual page 672

6A6-8 6.2L DIESEL
6. Hydraulic lifters, through the access hole in the cylin­
der head. On R/V Models, use J 29834 (figure 8) and
a magnet. Place the lifters in an organizer rack. The
lifters must be installed in the same bore from which
they were removed.
\ m Inspect
• Hydraulic lifter body for scuffing and scoring. Replace
the lifter if present.
• Roller for looseness and excessive play. Check for
missing or broken needle bearings. Replace if
necessary.
• Roller surface for pits and roughness. If present, the
mating camshaft lobe should also be checked. If the
lobe is pitted or rough, replace both camshaft and
lifter.
Hydraulic Lifter Repair
• Refer to the 1988 Light Duty Trucks Unit Repair
Manual.
] Important
• Some engines will have both standard and 0.010-inch
oversize hydraulic lifters. The oversize lifter will have
a "10" etched on the side. The block will be stamped
"O.S." on the cast pad adjacent to the lifter bore and
on the top rail of the cylinder case above the lifter
bore.
Figure 7 — Aligning the Timing Mark
J 29834
Figure 8 — Removing the Hydraulic Lifter
L00395