4. Connecting Rod Cap Nuts - GMC G Service Manual

6A5-18 7.4 LITER V8
5. Connecting rod cap. Check the connecting rod and
cap for identification marks. Mark the parts if required.
The connecting rod and cap must be kept together as
mating parts.
6. Connecting rod and piston.
• Attach J 5239 to the connecting rod bolts (figure
27).
• Use the long guide rod of J 5239 to push the
connecting rod and piston out of the bore.
7. Connecting rod bearing.
Cleaning, Inspection, and Repair
Clean, inspect and repair or replace the components as
necessary. Measure connecting rod bearing clearance, pis­
ton clearance, ring clearances, etc. Refer to the proper unit
repair manual.
The unit repair manual contains information on:
• Connecting rod and piston.
• Piston rings.
• Connecting rod and crankpin.
• Cylinder bores.
h H Install or Connect (Figures 27 through 31)
Tools Required:
J 5239 Connecting Rod Guide Set
J 8037 Ring Compressor
• Make sure the cylinder walls are clean. Lubricate the
cylinder wall lightly with engine oil.
• Make sure the piston is installed in the matching cylin­
der for which it was fitted. Used pistons must be
installed in the cylinder from which they were
removed.
1. Connecting rod bearings.
• Be certain that the bearings are of the proper
size.
• Install the bearings in the connecting rod and
connecting rod cap.
• Lubricate the bearings with engine oil.
2. Piston and connecting rod to the proper bore.
• With the connecting rod cap removed, install
J 5239 onto the connecting rod studs.
• Locate the piston ring end gaps as shown in
figure 28. Lubricate the piston and rings with
engine oil.
• Without disturbing the ring end gap location,
install J 8037 over the piston (figure 29).
• The piston must be installed so that the valve
clearance notches are towards the center of the
engine (figure 30).
• Place the piston in its matching bore. Using light
blows with a hammer handle, tap the piston
down into its bore (figure 29). At the same time,
from beneath the vehicle guide the connecting
rod to the crankpin with J 5239 (figure 27). Hold
the ring compressor against the block until all
rings have entered the cylinder bore.
• Remove J 5239 from the connecting rod bolts.
] Important
• Each connecting rod and bearing cap should be
marked, beginning at the front of the engine.
Cylinders 1, 3, 5 and 7 are the left bank and 2,
4, 6 and 8 are the right bank. The numbers on
the connecting rod and bearing cap must be on
the same side when installed in the cylinder
bore. If a connecting rod is ever transposed
from one block or cylinder to another, new con­
necting rod and bearings should be fitted and
the connecting rod should be numbered to cor­
respond with the new cylinder number.
I d I Measure
• Connecting rod bearing clearance. Refer to the
proper unit repair manual.
3. Connecting rod cap and bearing.

4. Connecting rod cap nuts.

Tighten
• Connecting rod cap nuts to 66 N*m (48 ft. lbs.).
Itj|| Measure
• Connecting rod side clearance. Use a feeler
gage between the connecting rod and crank­
shaft (figure 31). The correct clearance is
0.013-0.023-inch (0.33-0.58 mm).
5. Oil pump (if removed), as outlined previously.
6. Oil pan and cylinder head, as outlined previously.
6
ENGINE LEFT ENGINE FRONT
B. 2nd Compression Ring Gap
C. Oil Ring Spacer Gap
(Tang In Hole Or Slot With Arc)
D. Top Compression Ring Gap
Figure 28 — Ring End Gap Location
ENGINE RIGHT
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b