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6A5-18
1 9 7 7 PONTIAC SERVICE MANUAL
Fig. 6A5-36 Measuring Plastic Gage (Rod Bearings)
-
Typical
NOTE: Plastic gage should be positioned exactly in the
middle of upper or lower bearing shell. Bearings are
excentric and false readings could occur.
Install the cap and tighten cap bolts to proper torque.
(Do not turn crankshaft with plastic gage in place).
4. Remove bearing cap and using plastic gage scale on
envelope measure width of compressed plastic gage before
removing it from the bearing or journal (Fig. 6A5-37).
If the clearance is excessive, replace the bearing with the
next undersize bearing and recheck clearance. Bearings are
available in standard size, .001" and .002" undersize.
5. Repack the rear main bearing oil seal in the cylinder
block and install a new rear main bearing oil seal in the cap
if the rear main bearing was checked and/or replaced.
REAR M A I N BEARING OIL SEAL
Remove
1. Remove oil pan (see OIL P A N
-
REMOVE A N D
REPLACE).
2. Remove oil pump.
3. Remove rear main bearing cap.
4. Use tool shown in Fig. 6A5-38 made from brass bar
stock to pack upper seal as follows:
a. Insert tool against one end of the oil seal in the
cylinder block and drive the seal gently into the groove until
the tool bottoms.
b. Remove the tool and repeat at the other end of the
seal in the cylinder block.
c. Clean the block and bearing cap parting line
thoroughly.
d. Form a new seal in the cap (Fig. 6A5-39).
e. Remove the newly formed seal from the cap and cut
four (4) pieces approximately 3/8" long from this seal.
Fig. 6A5-37 Measuring Plastic Gage (Main Bearings)
-
Typical
2
SHARP CORNERS
2-112" R. MlN.
NOTE: BREAK ALL
t 1 1 2 " DIA.
SHARP CORNERS
314"
Fig. 6A5-38 Upper Rear Main Bearing Seal Tool
f. Work two 3/8" pieces into each of the gaps which have
been made at the end of the seal in thecilinder block.
Without cutting off the ends, work these seal pieces in until
flush with the parting line and until no fibers are protruding
over the metal adjacent to the groove.
g. Form another new seal in the cap (Fig. 6A5-39).
h. Assemble the cap to the block and tighten to 100 Ib.
ft.
i. Remove the cap and inspect the parting line to insure
that no seal material has been compressed between the block
and the cap. Clean as necessary.
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