Oil Pan Replacement (R/V Models); Oil Pump Replacement (R/V Models) - GMC G Service Manual

6A6-20 6.2L DIESEL
M Install or Connect (Figure 20)
1. New O-ring to the dipstick tube.
2. Dipstick tube to the vehicle.
• Raise the vehicle. Support with suitable stands.
3. Dipstick tube to the oil pan.
• Be sure the bead is fully seated.
4. Left exhaust manifold. Refer to "Exhaust Manifold
Replacement" in this section.
• Lower the vehicle.
5. Dipstick tube bracket at the rocker arm cover.
6. Dipstick tube bracket at the thermostat housing.
7. Air cleaner.
8. Engine cover.
9. Battery cables.
OIL PAN REPLACEMENT
(R/V MODELS)
M Remove or Disconnect
1. Battery cables.
• Raise the vehicle. Support with suitable safety
stands.
• Drain the engine oil.
2. Flywheel cover.
3. Left front engine mounting through-bolt.
NOTICE: When raising or supporting the engine
for any reason, do not use a jack under the oil
pan, crankshaft pulley or any sheet metal. 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.
• Raise the engine.
4. Oil pan bolts.
5. Oil pan.
6. Oil pan rear seal.
PCH Clean
1. Old RTV from the oil pan and block.
2. All oil and grease from the gasket surfaces.
H Install or Connect (Figures 22, 36, and 37)
• 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 22).
The sealer must be wet to the touch when the oil pan
is installed.
1. Oil pan rear seal.
2. Oil pan to the engine. Be sure to connect the oil dip­
stick. Refer to "Dipstick Tube Replacement" in this
section.
3. Oil pan bolts.
Tighten
• All except rear two bolts to 10.0 N*m (84 in. lbs.).
• Rear two bolts to 23 N*m (17 ft. lbs.).
• Lower the engine.
NOTICE: See " Notice" on page 6A6-1 of this
section.
4. Engine mounting through-bolt and nut.
I ^ l Tighten
• Fasteners to specifications. Refer to figures 36
and 37.
5. Flywheel cover.
• Lower the vehicle.
6. Proper quantity and grade of engine oil. Refer to
MAINTENANCE AND LUBRICATION (SEC. OB).
7. Battery cables.
OIL PUMP REPLACEMENT
(R/V MODELS)
M Remove or Disconnect (Figure 22)
1. Oil pan. Refer to "Oil Pan Replacement" in this
section.
2. Oil pump to main bearing cap bolt.
3. Oil pump and extension shaft.
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.