GMC 1982 Light Duty Truck, Service Manual

Page: 682 / 1435

6A4-22 SMALL BLOCK
connecting rods against sides of engine so they will not be in
the way while replacing cam shaft bearings.
1. With cam shaft and crankshaft removed, drive c am ­
shaft rear plug from cylinder block.
2. Using Tool J-6098, with nut and thrust washer in­
stalled to end of threads, index pilot in cam shaft front
bearing and install puller screw through pilot.
3. Install remover and installer tool with shoulder toward
bearing, making sure a sufficient am ount of threads are
engaged.
4. Using two wrenches, hold puller screw while turning
nut. W hen bearing has been pulled from bore, remove
remover and installer tool and bearing from puller
screw (fig. 6A4-36).
5. Remove remaining bearings (except front and rear) in
the same manner. It will be necessary to index pilot in
cam shaft rear bearing to remove the rear intermediate
bearing.
6. Assemble remover and installer tool on driver handle
and remove ca m sh a ft front and rear bearings by
driving towards center of cylinder block (fig. 6A4-37).
In s ta lla tio n
The c a m sh a ft front and rear bearings should be
installed first. These bearings will act as guides for the pilot
and center the remaining bearings being pulled into place.
1. Assemble remover and installer tool on driver handle
and install cam shaft front and rear bearings by driving
towards center of cylinder block (fig. 6A4-37).
2. Using Tool Set J-6098, with nut then thrust washer
installed to end of threads, index pilot in cam shaft front
bearing and install puller screw through pilot.
3. Index camshaft bearing in bore (with oil hole aligned as
outlined below), then install remover and installer tool
on puller screw with shoulder toward bearing.
• N u m b e r one cam bearing oil hole must be positioned
so t h a t oil holes are e quidistant from 6 o’clock
position.
Fig. 6A4-36--Rem oving Cam shaft Bearings
Fig. 6A4-37~Replacing Cam shaft Front Bearing
• N u m b e r two through num ber four bearing oil holes
must be positioned at 5 o’clock position (toward left
side of engine, and at a position even with bottom of
cylinder bore).
• N u m b e r five bearing oil hole must be in 12 o’clock
position.
4. Using two wrenches, hold puller screw while turning
nut. A fter bearing has been pulled into bore, remove
the remover and installer tool from puller screw, and
check alignment of oil hole in cam shaft bearing.
5. Install remaining bearings in the same manner. It will
be necessary to index pilot in the cam shaft rear bearing
to install the rear interm ediate bearing.
6. Coat new cam shaft rear plug O.D. with # 1 0 5 2 0 8 0
sealant, or equivalent, and install flush to 1 /3 2 "
(,80mm) deep.
OIL P A N
Removal
1. Drain engine oil.
2. Remove exhaust crossover pipe.
3. On vehicles equipped with a u to m a tic transm ission,
remove converter housing under pan.
4. On ’K’ models with autom atic transmission, remove
strut rods at motor mounts.
5. Remove oil pan and discard gaskets and seals.
Installation
1. Thoroughly clean all gasket and seal surfaces on oil
pan, cylinder block, crankcase front cover and rear
main bearing cap.
2. Install new oil pan side gaskets on cylinder block using
gasket sealant as a retainer. Install new oil pan rear seal
in rear main bearing cap groove, with ends butting side
gaskets. Install new oil pan front seal in groove in
crankcase front cover with ends butting side gaskets.
3. Install oil pan and torque bolts to specifications.
4. If ’K ’ model, replace strut rods.
5. Install converter housing under pan.