Hummer H1 Service Manual page 65

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2-28 Engine
22. Install fan pulley, fan, and fan clutch. Tighten attaching
nuts to 15-20 lb-ft (20-27 N¥m).
23. Install serpentine drive belt.
24. Connect heater and bypass hoses at water pump and
crossover. Then attach radiator upper inlet hoses to inlet
tube.
25. Install radiator and shroud (Figure 2-21). Then install air
conditioning condenser and power steering fluid cooler.
26. Connect radiator upper and lower hoses.
27. Fill cooling system.
28. Connect battery negative cables.
29. Evacuate and recharge air conditioning system if
necessary.
30. Start and run engine to verify proper operation. Purge air
from cooling system (if necessary), and top off coolant
level at surge tank.
31. On turbo diesel, reprogram TDC offset. Refer to procedure
at end of this section.
OIL PUMP SERVICE
Removal
1. Drain engine oil and remove oil Þlter.
2. Remove oil pan bolts.
3. Tap oil pan with rubber mallet to break sealer bead. Use
putty knife to help separate sealer bead if necessary. Then
remove pan.
4. Loosen screw that secures bracket on oil pump pickup
tube.
5. Remove nut that secures tube bracket to oil pump
mounting stud (Figure 2-31). Then rotate bracket off stud.
6. Remove oil pump mounting stud (Figure 2-31).
7. Remove oil pump and pump shaft.
Inspection And Replacement
The oil pump can be disassembled for inspection but not re-
paired. The oil pump is only serviced as an assembly. Individ-
ual parts are not available.
Replace the pump if the oil pickup strainer and tube are loose,
cracked, or distorted. Also replace the pump if the housing is
damaged or the pump gears are worn, chipped, or cracked.
Check the pump shaft and pressure relief valve and spring. Re-
place the pump if the spring is collapsed or broken, the valve is
damaged, the retaining pin is loose, or damaged, or the pump
shaft is worn or damaged.
The oil pickup strainer can be cleaned with spray-type carb
cleaner if necessary. However, replace the pump if heavy accu-
mulations of oil sludge, grit, foreign material, or metal chips
are present.
PUMP SHAFT
OIL PUMP
PUMP
MOUNTING
STUD
Figure 2-31: Oil Pump Mounting
Installation
1. Prime oil pump. Pour about four ounces of engine oil into
pump through strainer and rotate shaft to coat gears.
2. Insert pump shaft into block. Then align and seat pump.
3. Install and tighten pump mounting stud to 59-74 lb-ft (80-
100 N¥m) torque.
4. Rotate pickup tube bracket onto pump mounting stud.
Then install and tighten bracket retaining nut to 35 lb-ft
(47 N¥m).
5. Tighten clamp screw on pickup tube bracket to 12 lb-ft
(16 N¥m) torque.
6. Clean oil pan and engine block sealing surfaces with
scraper and solvent. Final clean surfaces with brake or
electrical contact cleaner to remove all residue. Otherwise,
RTV sealer will not adhere properly.
7. Apply RTV-type sealer to front cover, oil pan, and engine
pan rail surfaces. Sealers such as Permatex ultra copper, or
black are equally acceptable.
8. Install rear seal in oil pan.
9. Position oil pan on engine and front cover. Then install
and tighten oil pan bolts as follows:
¥ Tighten rear two bolts to 89 lb-in (10 N¥m) torque.
¥ Tighten remaining bolts to 17 lb-ft (23 N¥m) torque.
10. Install oil filter and refill with recommended grade engine
oil.
BRACKET
TUBE
STRAINER
¨