Oil Pan Replacement - GMC G Service Manual

6A5-12 7.4 LITER V8
A. Cut This Portion From New Seal
Figure 15 — Front Oil Pan Seal Modification

OIL PAN REPLACEMENT

h H Remove or Disconnect (Figure 17)
1. Battery negative cable.
2. Fan shroud from the radiator and push rearward.
3. Air cleaner.
4. Distributor cap.
• Raise the vehicle. Support with suitable safety
stands.
• Drain the engine oil.
5. Starter (vehicles with manual transmission).
6. Torque converter or clutch cover.
7. Oil filter.
NOTICE: Oil pressure line must be removed
from the side of the block to prevent crushing of
the line when the engine is raised.
8. Oil pressure line from the side of the block.
NOTICE: When raising or supporting the engine
for any reason, do not use a jack under the oil
pan, any sheet metal or crankshaft pulley. Due
to the small clearance between the oil pan and
the oil pump screen, jacking against the oil pan
may cause it to be bent against the pump
screen, resulting in a damaged oil pickup unit.
• Support the engine with a suitable lifting fixture.
9. Engine mounting through-bolts.
• Raise the engine only enough to permit oil pan
removal.
B-07870
10. Oil pan bolts, timing marker (if used), clips, and rein­
forcements.
11. Oil pan.
12. Gaskets and seals.
Piifl Clean
• Gasket surfaces on the engine and oil pan.
H Install or Connect (Figure 17)
• Apply RTV sealer to the front and rear corners of the
gaskets (74).
1. Gaskets (74) to the block. Use gasket sealer to hold
them in place.
2. Rear oil pan seal (76) to the groove in the rear main
bearing cap, with the ends mating against the gaskets
(74).
3. Front oil pan seal (78) by pressing the locating tips
into the holes in the front cover. The ends should
mate against the gaskets (74).
4. Oil pan.
5. Oil pan bolts, timing marker (if used), clips, and
reinforcements.
HO
Tighten
• Oil pan to front cover bolts to 7.9 N»m (70 in.
lbs.).
• Oil pan to block bolts to 18.1 N«m (160 in. lbs.).
• Lower the engine.
NOTICE: See " Notice'' on page 6A5-1 of this
section.
6. Engine mounting through bolts.
HO
Tighten
• Through-bolts to specifications. Refer to figures
35, 36, and 37.
7. Oil pressure line.
8. Oil filter.
9. Torque converter or clutch cover.
10. Starter (if removed).
• Lower the vehicle.
11. Distributor cap.
12. Air cleaner.
13. Fan shroud.
14. Proper quantity and grade of engine oil.
15. Battery negative cable.