GMC C Series 1993, Repair Manual

Page: 165 / 264

V8 ENGINES, GASOLINE 6A2-9
TIM ING CHAIN AND CAMSHAFT
SPROCKET REMOVAL
I n s p e c t ( F i g u r e 1 4 )
*
Timing^chain free play. If the chain can be moved
back and forth in excess of 16 mm (5/8 inch),
make a note to replace the timing chain during
assembly.
R e m o v e o r D i s c o n n e c t ( F i g u r e 1 4 )
1. Bolts (100).
2. Camshaft sprocket (101) and timing chain (102)
together.
CAMSHAFT REMOVAL
R e m o v e o r D i s c o n n e c t ( F i g u r e 1 5 )
• Camshaft.
A. Install three 5/16-18 bolts 100-125 mm (4-5
inches) long into the camshaft tapped holes.
Use these bolts to handle the camshaft.
B. Pull the camshaft from the block.
• Use care to prevent damage to the camshaft
and bearings.
PISTON AND CONNECTING
ROD REMOVAL
3 R e m o v e o r D i s c o n n e c t ( F i g u r e s 1 6 a n d 1 7 )
Tool Required:
J 5239 Connecting Rod Guide Set
1. Ridge (or deposits) at the top of the cylinders as
follows:
A. Turn the crankshaft until one piston is at the
bottom of its stroke. Place a soft cloth on top of
the piston.
B. Using the manufacturer’s directions, install a
ridge reamer into the top of the cylinder (figure
16). Perform the cutting operation.
Figure 14—Timing Chain and Sprockets
F i g u r e 1 6 — R e m o v i n g t h e C y l i n d e r R i d g e
C. After the ridge and/or deposits are removed,
remove the ridge reamer. Turn the crankshaft
until the piston is at the top of its stroke.
Remove the cloth and cuttings.
D. Repeat this procedure for each piston,
2. Connecting rod caps as follows:
A. Make note of the arrangement of the connect­
ing rod markings, to ensure they will be
returned to their proper position during assem­
bly. Mark the connecting rods with a scratch awl
if necessary.
B. Remove the connecting rod nuts.