Hummer H1 (1992-1998). Manual - part 15

2-16. CYLINDER BLOCK REPAIR (Cont’d)

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2-16. CYLINDER BLOCK REPAIR (Cont’d)

k.

1.

m.

n.

o.

p.

q.

r.
s.

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CAUTION

All five bearings must have an oil hole at the approximate ten

o’clock position, when viewed from the front with the block in an
upside down position, or engine damage will result.
The seam in the bearing must always be located in the lower
half of the block face, when viewed with the block in an upside
down position, or engine damage will result.

The front bearing has an additional oil hole which will be located
between the six and seven o’clock positions. This bearing also
has a notch which must be positioned toward the front of the
block, or engine damage will result.
All oil holes in camshaft bearings must be aligned with grooves
in camshaft bearing bores after installation, or engine damage
will result.

Using driver handle and adapter J 6098-11, align number one camshaft bearing (4) so oil
hole (5) is facing down and oil hole (6) is at or near the ten o’clock position and install into
cylinder block (1). Remove installation tools and check to be sure oil holes (5) and (6) align

with groove (3) in bearing bore (2).

Using driver handle and adapter J 6098-12, align number five camshaft bearing (9) so oil

hole (10) is at or near the ten o’clock position and install into cylinder block (1). Remove
installation tools and check to be sure oil hole (10) is aligned with groove (7) in bearing
bore (8).
Install number two camshaft bearing (11) on adapter J 6098-11 and position in cylinder
block (1) so oil hole (12) is at or near the ten o’clock position. Install pilot in number one
camshaft bearing (4) and install threaded rod through pilot and thread into adapter.
Hold threaded rod stationary and tighten long hex nut to install camshaft bearing ( 11) in
cylinder block (1), remove installation tools, and check to be sure oil hole (12) is aligned with
groove (16) in bearing bore (13).
Repeat steps m. and n. for number three camshaft bearing (17).
Working from rear of cylinder block (1), repeat steps m. and n. for number four camshaft
bearing (18).
Apply anaerobic sealing compound to outside diameter of rear plug (19)
block (1) until flush or 1/32-in. (0.79 mm) deep.
Install five main bearing caps (15) on cylinder block (1) and secure with
Install cylinder block (1) on engine stand.

and install in cylinder

twenty capscrews (14).

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2-16. CYLINDER BLOCK REPAIR (Cont’d)

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2-17. CRANKSHAFT REPAIR

This task covers:

a. Cleaning

c. Repair

b. Inspection

INITIAL SETUP

Tools

Equipment Condition

General mechanic’s tool kit:

Engine disassembled

automotive (Appendix E, Item 1)

(para. 2-15).

Micrometer (Appendix E, Item 16)

Materials/Parts

Abrasive crocus cloth (Appendix B, Item 5)

Manual References

into subassemblies

1. Clean all drilled oil passages (5) with a rod and cloth.

2. Refer to para. 2-9 for additional cleaning information.

NOTE

For general inspection instructions, refer to para. 2-10.

1. Inspect crankshaft (1) for scratches, nicks, and cracks. Replace if scratched, nicked, or cracked.

2. Check main bearing journals (4) and connecting rod journals (6) for taper, out-of-round, and

diameter using an outside micrometer. Replace crankshaft (1) if any bearing journal is tapered,
out-of-round, or out of specifications (table 2-2 or 2-3).

3. Inspect rear seal area (3) for roughness, scoring, grooving, flaking, pitting, and galling. Replace

crankshaft (1) if rough, scored, grooved, flaked, pitted, or galled.

4. Inspect threaded holes (2) and (7) in crankshaft (1) for damage. Replace crankshaft (1) if threads

are damaged.

Buff all minor nicks and scratches using abrasive crocus cloth.

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