Piston And Connecting Rod Installation - GMC 1989 Light Duty Truck Repair Manual

6A2-22 2.8 LITER V-6
The torsional damper has three timing notches on the
inertia ring. The number one cylinder timing reference
mark will be identified by a dab of white paint. If a new
dam per assembly is installed, mark the new assembly in
the same place for future reference. Number one cylinder
reference is the first clockwise mark from the keyway
when viewing the engine from the front.
- n -
Install or C onnect
Tool Required:
J 29113, Torsional Damper Installer
Engine oil to the front cover seal contact area on the
damper.
Sealant (GM Part No. 1052366 or equivalent) on the
key and the key way.
Damper over the key on the crankshaft.
Pull the damper onto the crankshaft.
• Install J 29113 into the crankshaft so at least 6
mm (1 /4-inch) of thread is engaged.
• Pull dam per into position and remove J 29113
from the damper.
5. Torsional damper retaining bolt.
$ T igh ten
• Bolt to 95 N-m (75 ft. lbs.).
6. Drive pulley to the damper.
PISTON AND CONNECTING
ROD INSTALLATION
CONNECTING ROD BEARING SELECTION
Connecting rod bearings are of the precision insert type
and do not use shims for adjustment. DO NOT FILE
RODS OR ROD CAPS. If clearances are excessive install
a new bearing. Service bearings are available in standard
size and 0.013 mm and 0.026 mm undersize for use with
new and used standard size crankshafts.
-n - Install or C onnect
Tool Required:
J 8037, Ring Compressor
• Lubricate the cylinder walls lightly with engine oil.
• Make sure the piston is installed in the proper
cylinder with the notch forward.
Connecting rod bearing inserts.
1.
• Be certain that the inserts are of the proper
size.
• Install the inserts in the connecting rod and
connecting rod cap.
2. Piston and connecting rod to the proper bore.
• Install guide hose over the threads of the rod
studs to prevent damage to the bearing journal
and rod studs.
• Locate the ring end gaps as shown in figure
34.
• Lubricate the piston and rings with engine oil.
• Without disturbing the ring end gap location,
install J 8037 over the piston.
• Use a hammer handle to tap the piston down
into its matching bore (figure 35).
— The notch in the piston crown must face
the front of the engine.
0
ENGINE LEFT ENGINE FRONT
A. Oil Ring Rail Gaps
B. 2nd Compression Ring Gap
C. Notch In Piston
D. Oil Ring Spacer Gap
(Tang In Hole Or Slot With Arc)
E. Top Compression Ring Gap
Figure 34— Piston Ring End Gap Location
• While tapping the piston into its bore, guide
the c o n n e c tin g rod into p o sitio n on the
crankpin. Hold the ring compressor against
the block until all rings have entered the
cylinder bore.
Im p o rta n t
Each connecting rod and bearing cap should
be m arked, beginning at the front of the
engine. Cylinders 2, 4, and 6 are the left bank
and, 1, 3, and 5 are the right bank. The
ENGINE RIGHT
B-07895