Valve Train Components; Hydraulic Lifters; Cylinder Head - GMC 1989 Light Duty Truck Repair Manual

6A2-16 2.8 LITER V-6
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Tighten
• Screws to 9.0 N-m (80 in. lbs.).
Turn the drive shaft by hand to check for smooth
operation.
N O TIC E: Be c arefu l o f tw istin g, sh earin g or
collapsing the p ip e w hile installing in the pum p.
7. Pick-up screen and pipe (if removed) (figure 22).
• If the pick-up screen and pipe assembly was
removed, it should be replaced with a new
part. Loss of press fit condition could result in
an air leak and loss of oil pressure.
• Mount the oil pump in a soft jawed vise.
• Apply sealer to the end of the pipe.
• Tap the pick-up screen and pipe into place,
using J 21882 and a hammer.
• The pump screen must be parallel with the
bottom of the oil pan when installed.
8. Oil pump drive shaft (103) and connector (104).

VALVE TRAIN COMPONENTS

PUSHRODS, ROCKER ARMS, BALLS, AND NUTS
131
Clean
Parts in solvent. Blow dry with compressed air.
Make sure the oil passages in the pushrods are
clear.
Inspect
P
• Rocker arms and balls at their mating surfaces.
These surfaces should be smooth and free from
scoring or other damage.
• Rocker arm areas which contact the valve stems
and the sockets which contact the pushrods. These
areas should be smooth and free of damage and
wear.
• Rocker arm nuts.
Figure 22— Installing the Oil Pump Screen
DISASSEMBLY
*--► R em ove or D isconnect (Figures 23 and 24)
CLEANING AND INSPECTION OF COMPONENTS
and perform the following.
i g i
P
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• Pushrods for bending. Roll the pushrod on a flat
surface to dete rm ine if it is bent. R eplace if
necessary.
• Pushrod ends for scoring or roughness.

HYDRAULIC LIFTERS

Refer to GENERAL ENGINE MECHANICAL (SEC. 6A).

CYLINDER HEAD

Tool Required:
J 8062, Valve Spring Compressor
1. Valve keepers (22).
• Compress the springs with J 8062 (figure 24).
• Remove the keepers.
• Remove J 8062.
2. Caps (23), oil shedder (24), and springs.
3. O-ring seals (26) and seals (25) (if used).
4. Valves (20 and 21).
• Place the valves in a rack so they can be
returned to their original position at assembly.
Refer to GENERAL ENGINE MECHANICAL (SEC. 6A)
Clean
Components as outlined.
Inspect
Components as outlined.
M easure
• Valve stem clearance.
• Valve spring tension and free length.
Other information outlined includes:
• Valve and seat grinding.