Camshaft Bearings; C Am Shaft Bearing Replacem Ent (2.5 L And 6.2 L E N G In E; C Am Shaft Bearing Replacem Ent (All Except 2.5 L And 6.2 L E N G In E - GMC 1989 Light Duty Truck Repair Manual

6A-12 GENERAL ENGINE MECHANICAL
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A. Bearing Tool C. N ut
B. P ilo t D. P u lle r S crew
Figure 19— Removing or Installing the Inner

Camshaft Bearings

CAMSHAFT BEARING
REPLACEMENT (2.5 L AND
6.2 L ENGINES)
Refer to the proper section.
CAMSHAFT BEARING
REPLACEMENT (ALL EXCEPT
2.5 L AND 6.2 L ENGINES)
Inspect
Camshaft bearings for scratches, pits, or loose fit in
their bores. Replace the cam shaft bearings if
necessary.
« ■> D isassem ble (Figures 19 and 20)
Tool Required
J 6098-01 Camshaft Bearing
Remover and Installer
1. Rear camshaft plug or cap.
2. Inner camshaft bearings. Use J 6098-01 (figure 19).
• Insert the pilot into the front camshaft bearing
bore.
• Slide the p u lle r screw, w ith the nut and
washer, through the pilot.
• Insert the bearing tool into the inner camshaft
bearing bore, with the shoulder of the tool
against the bearing.
• Hold the puller screw with a wrench. Turn the
nut with a second wrench to pull the camshaft
bearing from its bore.
• R e p e a t th is
remaining inner camshaft bearings. Note that
the rear inner bearing must be removed with
the pilot fitted into the rear camshaft bearing.
3. Outer camshaft bearing. Use J 6098-01 (figure 20).
CAMSHAFT BEARINGS
£3
| ]u>m
l$3
B-05276
p ro c e d u re to rem o ve
Figure 20— Removing or Installing the Outer
• Assemble the bearing tool and driver handle.
• Drive the outer camshaft bearings out of the
block.
imp
Clean
Camshaft bearing bores in the block.
*
Assem ble (Figures 19, 20, and 21)
Tool Required
J 6098-01 Camshaft Bearing
Remover and Installer
The outer camshaft bearings must be installed first.
These bearings serve as guides for the pilot, and
help center the inner bearings during the installation
process.
Be sure to fit the correct cam bearing into the bore.
The cam bearing bores vary in size.
A. C h e c k in g o il h ole a lig n m e n t w ith b rass rod.
M ake rod as s h o w n u s in g 3/32" rod a b o u t
762 m m (30") long.
th e
Figure 21— Checking Camshaft Bearing Oil Hole
A. Bearing Tool
B. Driver H andle
Camshaft Bearings
Alignment (Typical)
B.05277
B-09446