GMC 1976 ZEO 6083 Maintenance Manual page 327

6A- 62 ENGINE
Figure 73-Guide Tool Installed
with a single edge razor blade. Measure the amount
the seal was driven up on the other side . Add 1/16"
and cut another length from old seal . Use main bear-
ing cap as a holding fixture when cutting seal .
5 . Place a drop of 1050026 Sealer or equivalent,
on each end of seal and cap as indicated.
6. Work these two pieces of seal into the cylinder
block (one piece on each side) with two small screw-
drivers. Use guide tool J-21526-1 as shown in Figure
73 . Using packing tool, pack these short pieces up
into the block. See Figure 74 .
NOTE : Place a piece of shim stock between seal
and crankshaft to protect bearing surface before
trimming .
7 . Form a new rope seal in the rear main bearing
cap. Refer to -"Rear Main Lower Oil Seal" next in
this section .
8. Assemble the cap to the block and torque to
120 ft . lbs.
REPLACEMENT
1 . Remove crankshaft . Refer to "Crankshaft"
earlier in this section.
2. Remove upper oil seal .
3. Install a new rear main bearing upper seal . Use
tool J-26484 as shown in Figure 75 .
Figure 74-Packing Seal Into Guide and Cylinder
Block
4. After correctly positioning seal, rotate tool
slightly and cut off each end of seal flush with block.
5. Install crankshaft as described earlier in this
section under "Crankshaft" .
REAR MAIN LOWER OIL SEAL
REMOVAL
1 . Remove oil pan. Refer to "Oil Pan" earlier in
this section.
Figure 75-Installing Rear Main Seal-Upper Half