Hummer H1 Service Manual page 82

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OVERHAUL SERVICE INFORMATION
Anaerobic and RTV type sealers are both used during engine
re-assembly. Anaerobic sealer such as Loctite gasket maker
(515 or 510) is used on the timing chain cover. RTV sealers
such as Permatex Ultra Copper, Ultra Blue, or Loctite 599, are
used on the oil pan and rocker covers.
Thread locking chemicals such as Loctite 242 are specified
wherever necessary. In addition, Permatex dielectric com-
pound can be used on electrical connections to prevent corro-
sion.
Do not use substitute fasteners unless they are of the correct
size and hardness grade. When replacement bolts/nuts are re-
quired, it is recommended that parts catalog items be used.
This ensures that correct grade fasteners are used.
ENGINE REMOVAL
1. Remove front console attaching screws. Move console
rearward and disconnect console harness connector and
radio harness. Then remove console.
2. Disconnect Digital Ratio Adapter and Keyless Entry
Module. Remove inner engine cover.
3. Remove hood with aid of helper as follows:
• Unlatch and lower brushguard, if equipped.
• Unlatch and raise hood.
• Remove clip that attaches hood harness to driver side of
frame.
• Disconnect hood harness from cowl top harness.
• Remove bolts attaching prop and bracket to driver side
air lift bracket. Do not remove prop rod from hood.
Leave rod attached. Tape rod to hood if desired.
• Remove hood hinge pins.
• Remove hood with aid of helper.
4. Disconnect and remove batteries and cables.
5. Remove battery tray.
6. Remove driver and passenger side splash shields.
7. Drain engine coolant and engine oil.
8. Discharge A/C system with recovery machine set in
recovery mode.
9. Disconnect radiator upper and lower hoses at the radiator.
10. Drain fluid in power steering pump using a suction gun.
11. Disconnect oil lines at transmission and power steering
coolers. Cap lines to prevent dirt entry Figure 2-52.
12. Disconnect engine cooler lines for engine oil cooler. Cap
lines to prevent dirt entry.
13. Disconnect A/C lines at condenser. Cap or tape lines and
fittings to prevent dirt entry.
14. Remove rubber/sponge pads from air lift brackets.
15. Remove return hoses from power steering pump.
16. Remove surge tank hose from radiator.
05745159
17. Remove bolts attaching radiator and shroud assembly to
frame and brackets. Then (with aid of helper), remove
radiator, shroud, condenser, and oil coolers as an assembly
Figure 2-53.
.
COVER OPEN ENDS
OF ALL COOLER LINES
WITH DUCT TAPE
Figure 2-52: Covering Open Ends of Oil
Cooler Lines
Figure 2-53: Radiator, Cooler, Fan Shroud
Removal/Installation
18. Remove air horn from turbocharger and air cleaner hose
(Figure 2-54).
19. Disconnect radiator hose at thermostat housing and at
radiator upper and lower outlets.
20. Remove the engine oil dipstick and tube
21. Loosen tensioner and remove serpentine belt.
22. Using the spanner wrench and ratchet adapter, remove
cooling fan and clutch from water pump.
Engine 2-45
6-S02-009