Flywheel Removal; Crankshaft And Main Bearings Removal - Hummer H1 Service Manual

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2-60 Engine

Flywheel Removal

1. Remove six capscrews and flywheel from crankshaft
(Figure 2-97).
2. Remove flywheel attaching bolts with impact wrench and
suitable size socket.
3. Work flywheel off crankshaft flange with rocking motion.
CRANKSHAFT
FLANGE
Figure 2-97: Flywheel Removal

Crankshaft and Main Bearings Removal

1. Inspect main bearing caps. Note if caps have factory I.D.
markings on them. However, if caps do not have factory
marks, it will be necessary to mark each cap with a center
punch, or scriber. Main caps must be reinstalled in same
location and direction, to maintain bore alignment for
crankshaft journals (Figure 2-98).
2. Remove rear main oil seal.
3. Remove main bearing cap bolts. Discard bolts.
4. Tap main bearing caps with rawhide mallet to loosen.
Then lift and remove caps. Keep them in order of removal
(Figure 2-99).
5. Lift crankshaft out of bearing saddles in block. Place
crankshaft on bench for cleaning and inspection.
6. Remove main bearing upper halves from block. Keep
bearing halves for inspection and select fit reference.
MAIN BEARING CAPS
CAP LOCATION
AND I.D. MARKS
CAP BOLTS
(4 EACH)
Figure 2-98: Main Bearing Cap I.D. Marks
(REAR MAIN)
REAR
MAIN
SEAL
FLYWHEEL
BEARING
INSERTS
CYLINDER BLOCK SERVICE
Cleaning
The block can be cleaned with standard parts cleaning equip-
ment. However, if the crankcase and bores are heavily coated
with varnish, gum, carbon, sludge, or rust deposits in the cool-
ant passages, hot tanking will be necessary.
Clean out all oil galleys and water passages with wire brushes
designed for this purpose.
WARNING: The cam bearings (Figure 2-100) must be
replaced if the block is "hot tanked". The caustic solu-
tion used for this type of cleaning, will etch and weaken
bearing surfaces. The expansion plugs and oil filter
pressure regulating valve must also be removed before
hot tank cleaning.
Coat the block with a light solvent after cleaning to prevent
rust formation. Useful solvents are available from LPS Corp.,
Solder Seal, WD-40 and similar firms.
NO. 3
NO. 4
NO. 5
(THRUST)
CAP
CAP
OIL
Figure 2-99: Crankshaft and Bearing Removal
NO. 2
NO.1
CAP
CAP
(FRONT)
CAP
BEARING
INSERTS
CRANKSHAFT
®