Engine Replacement - GMC G Service Manual

6A7-28 4,8 LITER L6
REAR MOUNTING REPLACEMENT (P-MODELS WITH
FLYWHEEL HOUSING MOUNTING)
M Remove or Disconnect (Figure 46)
1. Bolt, cushion and spacer.
• Raise the rear of the engine only enough to permit
removal of the mounting.
2. Mounting.
Figure 46 — Rear Engine Mounting (P-Models With
Flywheel Housing Type Mounting)
K H Install or Connect (Figure 46)
1. Mounting. Align the hole in the mounting with the hole
in the crossmember.
• Lower the rear of the engine.
NOTICE: See " Notice" on page 6A7-1 of this
section.
2. Spacer, cushion and bolt.
I ^ l Tighten
• Bolt to 90 N«m (65 ft. lbs.).

ENGINE REPLACEMENT

Additional steps may be necessary on P-models
depending on body builder design.
H Remove or Disconnect
1. Negative battery cable.
2. Hood and sheet metal as required.
3. Air cleaner.
4. Radiator.
5. Heater hoses from the engine.
6. Accelerator cable.
7. Transmission detent cable (if equipped).
8. Fan and water pump pulley.
9. Fuel lines from the fuel pump.
10. Evaporate emission and other vacuum hoses.
11. Engine wiring.
12. Starter.
13. Exhaust pipe at the exhaust manifold. Wire the pipe
out of the way.
14. Flywheel cover.
15. Flywheel to torque converter bolts (automatic
transmission).
• Attach a suitable lifting device to the engine. Remove
the weight from the engine mountings.
16. Front engine mounting through-bolts.
• Support the transmission with a chain or transmission
jack.
17. Bell housing to engine bolts.
18. Engine. Move the engine forward to disengage the
transmission and remove.
H Install or Connect (Figures 41, 42 and 44)
1. Engine. Move the engine rearward to engage the
transmission.
2. Bell housing to engine bolts. Remove the transmis­
sion jack or support chain.
3. Front engine mounting through-bolts and nuts.
Tighten
• Fasteners to specifications. Refer to figure 41.
• Remove the lifting device.
4. Torque converter to flywheel bolts (automatic trans­
mission).
5. Flywheel cover.
6. Exhaust pipe and new packing to the exhaust mani­
fold.
7. Starter.
8. Engine wiring.
9. Vacuum hoses.
10. Fuel lines.
11. Fan and water pump pulley.
12. Transmission detent cable (if equipped).
13. Accelerator cable.
14. Heater hoses.
15. Radiator.
16. Air cleaner.
17. Hood and sheet metal.
18. Negative battery cable.
19. Proper quantity and grade of coolant.