Hummer H1 Service Manual page 79

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2-42 Engine
c. Stroke lifter plunger with pushrod to pump fluid
through lifter.
d. Remove lifter from container and wipe it dry with lint
free cloth or paper.
e. Re-prime lifter with clean engine oil.
2. Apply cam lube to lifter roller and bearings.
3. Install lifters as follows:
a. Insert lifter in bore with tool J
b. Align lifter and install guide plate on lifters. Be sure
lifters and plates are aligned.
c. Install guide plate clamp and bolt. Tighten bolt to 19
lb-ft (26 N¥m) torque.
4. Install cylinder head(s) as described in this section.
CRANKSHAFT BEARING
Replacement In-Vehicle
The crankshaft main and rod bearings can be replaced without
having to remove and completely disassemble the engine.
The rod bearings only require that the piston be at or near bot-
tom dead center for access. The main bearings are rotated out
of the bearing saddles with a 1/8 in. cotter pin or with equiva-
lent. Procedure is as follows:
1. Disconnect battery cables at batteries.
2. Remove skid plate/underbody protector, if equipped.
3. Drain engine oil from oil pan.
4. Remove oil pan.
5. Remove oil pump.
6. Replace rod bearings as follows:
a. Rotate crankshaft in counterclockwise direction until
connecting rod cap attaching nuts are accessible.
b. Remove rod cap nuts. Note position of rod cap for
installation reference.
c. Remove rod cap and lower half of bearing. Then push
piston upward slightly and remove upper half of
bearing.
NOTE: Connecting rod bearings are select fit parts. Record
the color code markings on each bearing half for parts ordering
and installation reference. Also note if cap was marked with
ÒOSÓ code which indicates oversize bearings are required.
d. Clean connecting rod and crankshaft bearing surfaces
and dry with lint free shop towels.
e. Install bearing halves in rod cap and in rod. Be sure
bearing locating tangs are seated in cap and rod
notches.
f. Check bearing clearance with plastigauge. Clearance
should be 0.0017-0.0039 in. (0.045-0.100 mm). Then
remove rod cap, clean plastigauge off surfaces, lubri-
cate crankshaft and bearing surfaces with engine oil
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29834.
and reinstall rod cap. Tighten new cap nuts to 44-52
lb-ft (60-71 N¥m) torque.
7. Replace main bearings as follows:
a. Loosen bearing cap bolts at adjacent bearings.
b. Remove bearing cap bolts at first bearing to be
replaced, and remove cap and bearing lower half
(mark cap for reference before removal).
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c. Insert tool J 8080 into oil hole in crankshaft bearing
journal. Position ÒTÓ-end of tool against bearing
upper half. Rotate crankshaft counterclockwise until
tool pushes upper half of main bearing out of bearing
saddle in block (Figure 2-48).
d. Clean main cap, crankshaft journal, and bearing
saddle in block with solvent. Refer to overhaul section
for bearing specifications and select fitting.
e. Start plain end of new upper bearing half into place by
hand. Then push bearing into position with tool
J8080. Be sure bearing tang is seated in notch in
bearing saddle of block (Figure 2-48).
f. Check bearing clearance with plastigauge. Clearance
should be 0.0017-0.003 in. (0.045-0.083 mm) for
bearings one through four and 0.002-0.0036 in.
(0.055-0.093 mm). Remove main cap, clean plasti-
gauge off surfaces, lubricate bearing halves and crank
journal with engine oil. Tighten new main bearing cap
bolts as follows:
¥ inner bolts to 111 lb-ft (150 N¥m)
¥ outer bolts to 100 lb-ft (136 N¥m)
8. Install oil pump.
9. Apply RTV-type sealer to oil pan sealing surfaces and
install pan. Tighten all but two rear pan bolts to 89 lb-in.
(10 N¥m) torque. Tighten two rear pan bolts to 17 lb-ft (23
N¥m) torque.
10. Install new oil filter and refill with engine oil. Use SAE
10W-30 for temperatures under 40¡F and 15W-40 for
temperatures above that figure.
11. Connect battery cable and reinstall skidplate.
12. Test run. Test for leaks.
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