GMC T Series 1994 Repair Manual page 536

Disassemble (Figures 49 and 50)
❖
Tools Required:
J 33049 Universal Camshaft Bearing Remover
and Installer Kit
1. Rear camshaft plug.
2. Inner camshaft bearings using J 33049 (figure 49).
A. Insert the pilot into the front camshaft bearing
bore.
B. Slide the puller screw, with the nut and washer,
through the pilot.
C. Insert the bearing tool using J 33049 into the
inner camshaft bearing bore, with the shoulder
of the tool against the bearing.
D. Thread the puller screw into the bearing tool.
Make sure enough threads are engaged.
E. Hold the puller screw with a wrench. Turn the
nut with a second wrench to pull the camshaft
bearing from its bore.
F. Repeat this procedure to remove the remaining
inner camshaft bearings. Note that the rear
inner bearing must be removed with the pilot
fitted into the rear camshaft bearing.
3. Front camshaft bearing using J 33049 (figure 49).
A. Assemble the bearing tool, driver handle, and
adapter.
B. Drive the front outer camshaft bearing out (Fig­
ure 50).
4. Rear camshaft bearing, as described in step 3
using J 33049 (figure 50).
f j f
Clean
Camshaft bearing bores in the block.
Assemble (Figures 49 and 50)
*
Tools Required:
J 33049 Universal Camshaft Bearing Remover
and Installer Set
The outer camshaft bearings must be installed first.
These bearings serve as guides for the pilot, and
help center the inner bearings during the installa­
tion process.
Be sure to fit the correct cam bearing into the bore.
ALL BEARING LOCATIONS ARE VIEWED FROM
THE FRONT OF THE BLOCK, WITH THE BLOCK
IN AN UPRIGHT POSITION. The cam bearing
bores vary in size. The cam bearings are num­
bered 1 through 5, with the numbers located on the
back of the bearing.
Rear camshaft bearing. Drive the bearing into
place using J 33049 (figure 50).
Important
• The bearing oil hole MUST align with the oil
hole in the block located at the 1 o'clock posi­
tion. The bearing seam must be located in the
11 o'clock position.
2. Front camshaft bearing. Drive the bearing into
place using J 33049 (figure 50).
Important
• The notch in the bearing must face the front of
the block.
• There are two oil holes in the front cam bearing.
Using the seam in the 11 o'clock position as a
reference point, one oil hole will be in the 1
o'clock position, and the other hole will be in
the 4:30 position.
• The front bearing must be installed with the
seam in the 11 o,clock, with the notch facing to
the front of the block, and the top oil hole in the
bearing at the 1 o'clock position, in line with the
oil hole in the block that is in the same location.
Figure 49— Replacing the Inner Camshaft Bearings
3706r5070
3706r5071