Oil Pan And Oil Pump Replacement (G-Models) - GMC G Service Manual

A. RTV Sealant
Oil Pump
110
.
111
Bolt
.
112
Oil Pan
.
Rear Seal
Figure 22 — Oil Pan and Oil Pump
H Install or Connect (Figure 22)
1. Oil pump and extension shaft to the engine. Align the
extension shaft hex with the drive hex on the oil pump
drive or vacuum pump. The oil pump should push
easily into place.
2. Oil pump bolt.
E 5 ] Tighten
• Oil pump bolt to 90 N*m (65 ft. lbs.).
3. Oil pan. Refer to "Oil Pan Replacement" in this
section.
OIL PAN AND OIL PUMP
REPLACEMENT (G-MODELS)
M Remove or Disconnect
1. Battery cables.
2. Engine cover.
3. Engine oil dipstick.
4. Engine oil dipstick tube at the rocker arm cover.
• Raise the vehicle. Support with suitable safety
stands.
5. Transmission. Refer to TRANSMISSION (SEC. 7).
• Drain the engine oil.
6. Engine oil cooler lines at the block.
7. Starter.
8. Oil pan bolts.
9. Oil pan and oil pump.
• Lower the oil pan from the engine.
• Rotate the crankshaft so that the forward crank­
• Oil pump to main bearing cap bolt.
• Let the oil pump and extension shaft fall into the
• Remove the oil pan and oil pan rear seal.
1. Old RTV from the oil pan and block.
2. All oil and grease from the gasket surfaces.
| y | Inspect
• Oil pump pick up tube and screen for damage.
• Oil pump extension shaft bushing for cracks.
Oil Pump Repair
• Refer to the 1988 Light Duty Trucks Unit Repair
Manual.
H Install or Connect (Figure 22)
B-08039
• Apply a 5 mm (3/16-inch) bead of RTV sealant (GM
part number 1052915 or equivalent) to the oil pan
sealing surface, inboard of the bolt holes (figure 18).
The sealer must be wet to the touch when the oil pan
is installed.
1. Oil pan rear seal to the oil pan.
2. Oil pan and oil pump to the engine.
• Lay the oil pump and extension shaft in the oil
• Hold the oil pan and position the oil pump to the
• Align the extension shaft hex with the drive hex
• Position the oil pan against the engine. Be sure
3. Oil pan bolts.
I ^ l Tighten
• All except rear two oil pan bolts to 10.0 N*m (84
• Rear two oil pan bolts to 23 N»m (17 ft. lbs.).
4. Starter.
5. Engine oil cooler lines.
6. Transmission. Refer to TRANSMISSION (SEC. 7).
• Lower the vehicle.
7. Engine oil dipstick tube at the rocker arm cover. Refer
to "Dipstick Tube Replacement" in this section.
8. Engine oil dipstick.
6.2L DIESEL 6A6-21
shaft throw and numbers 1 and 2 connecting
rod journals are up.
oil pan.
pan.
main bearing cap.
on the oil pump drive or vacuum pump. The oil
pump should push easily into place. Install the
oil pump bolt and tighten.
to connect the dipstick tube.
in. lbs.).