GMC 1989 Light Duty Truck, Repair Manual, Page: 549 / 998

6.2 LITER DIESEL 6A7-13
• Assem ble the bearing tool (J 6098-11) and
driver handle.
• Drive the outer cam shaft bearings out of the
block.
4. Rear cam shaft bearing, as described in step 3. Use
the driver handle and bearing tool J 6098-12 (figure
18).
Clean
• Cam shaft bearing bores in the block.
A ssem ble (Figures 17 and 18)
*
J 6098-10 Adapter Set
1. Rear camshaft plug.
2. In ne r c a m s h a ft b e a rin g s . Use J 6098-01 and
J 6098-10 (figure 17).
• 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 (J 6098-11) into the
inner camshaft bearing bore, with the shoulder
of the tool against the bearing.
• Thread the puller screw into the bearing tool.
Make sure enough threads are engaged.
• 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 p ro c e d u re to re m o v e th e
remaining inner cam shaft bearings. Note that
the rear inner bearing must be removed with
the pilot fitted into the rear camshaft bearing.
3. F ro n t c a m s h a ft b e a rin g . Use J 6098-01 and
J 6098-10 (figure 18).
Tool Required:
J 6098-01 C am shaft Bearing Remover and
Installer
J 6098-10 Adapter Set
• The outer cam shaft bearings must be installed first.
These bearings serve as guides for the pilot, and
h e lp c e n te r th e in n te r b e a rin g s d u rin g th e
installation process.
• Be sure to fit the correct cam bearing into the bore.
The cam bearing bores vary in size.
1. Rear cam shaft bearing. Drive the bearing into place
using the driver handle and J 6098-12 (figure 18).
Im p o rtan t
• The bearing oil hole MUST align with the oil
hole in the block. This hole is located at about
the 4 o’clock position from the block upright
(viewed from the front of the block).
• The seam in the bearing must be in the upper
half of the block face.
Front cam shaft bearing. Drive the bearing into place
with the driver handle and J 6098-11 (figure 18).
Im p o rtan t
• The notch in the bearing must face the front of
the block.
• There are two oil holes in the bearing. One
hole is located at about the 4 o’clock position;
the other is located between the 12 o’clock and
1 o’clock position (block upright). The bearing
oil holes MUST align with the holes in the
block.
• The seam in the bearing must be in the upper
half of the block face.
3. In n e r c a m s h a ft b e a rin g s. Use J 6098-01 and
J 6098-10 (figure 17).
• Assemble the tool with the pilot engaged in
the front bearing and the pilot flange against
the front face of the block.
• Slide the puller screw, with nut and washer,
through the pilot.
• Place the new bearing on the bearing tool
(J 6098-011). H old th e b e a rin g to o l and
bearing against the bearing bore. Align the
bearing oil hole with the oil hole in the block.
• Thread the puller screw into the bearing tool
enough to hold the tool and bearing in place.
• Holding the puller screw with a wrench, turn
the nut with a second wrench to pull the
camshaft bearing into place.