GMC 1990 Light Truck Repair Manual page 361

A. Press
B. A dju stab le In staller J-24086-9
C. S upport Fixture J-24086-20
D. C onnectin g Rod Support J-24086-11
E. Pin Guide
F. Lock Ring
G. A d ju ste r
H. N um ber Scale
Figure 13—Installing the Piston Pin
• Remove the piston and connecting rod
assembly from the tool and check the piston
for freedom of movement on the piston pin.
Assembling the Piston
and Connecting Rod (6.2 L Engines)
Assemble (Figures 7, 14, and 15)
*
Tool Required
J 29134-A Piston Pin Clip Installer
1. Piston to the connecting rod.
A. Piston Crown Indent
B. C onnecting Rod
Bearing Tangs
Figure 14—Aligning the Piston and Connecting Rod
GENERAL ENGINE MECHANICAL 6A-9
• The piston must be installed with the piston
2. Piston pin. Apply engine oil to the pin and push into
place.
3. Snap rings. Use J 29134-A (figure 15).
1 ?
Installing the Piston Rings (All Except 6.2 L)
Measure (Figures 4 and 16)
Ring end gap as follows:
1
. Select rings comparable in size to the piston
2. Slip the compressing ring in the cylinder bore:
3. Measure the space or gap between the ends
4. Refer to " Specifications" in the proper section
B-05076
5. If the gap between the ends of the ring is not
B
B-09401
crown indent on the same side as the
connecting rod bearing tang slots (figure 14).
Inspect
Snap rings for proper assembly. Rotate the
snap rings to make sure that they are seated
in their grooves.
being used.
then press the ring down into the cylinder bore
1 4
about 7 mm ( / -inch) above ring travel. Be
sure the ring is square with the cylinder wall.
of the ring with a feeler gage (figure 16).
for correct gap.
as specified, remove the ring and try another
for fit.