Hummer H1 (1992-1998). Instruction - page 12

2-15. ENGINE DISASSEMBLY INTO SUBASSEMBLIES

(Cont’d)

bb. Crankshaft and Main Bearings

1. Rotate cylinder block (6) so crankshaft (3) faces upward.

2. Check location numbers (5) on main bearing caps (4). If location numbers (5) are not clear, stamp

main bearing caps (4) for assembly.

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Change 1

2 - 1 5 . ENGINE DISASSEMBLY INTO SUBASSEMBLIES (Cont’d)

NOTE

Perform step 3 for 6.5L engines only.

3.

Remove one-piece crankshaft rear oil seal (9) from rear main bearing cap (1) and cylinder block (7).
Discard one-piece crankshaft rear oil seal (9).

4.

Remove four capscrews (3) securing main bearing cap (2) to cylinder block (7) and remove cap (2)
and bearing (4). Discard bearing (4).

5.

Repeat step (4) for remaining main bearing caps (2), rear main bearing cap (1), and bearings (4).

WARNING

.

Crankshaft must be supported during removal and installation.
Failure to support crankshaft may cause injury to personnel or
damage to equipment.

6.

Remove crankshaft (5) and bearings (6) from cylinder block (7). Discard bearings (6).

WARNING

.

Gaskets installed on some 6.2L engines assembled prior to 1991
may contain asbestos. Gaskets should be removed with a scraper
or putty knife and then be disposed of IAW current directives.
Inhalation of asbestos fibers can cause respiratory ailments.

NOTE

Perform step 7 for 6.2L engines only.

7.

Remove two-piece crankshaft rear oil seal (8) from rear main bearing cap (1) and cylinder block (7).
Discard two-piece crankshaft rear oil seal (8).

8.

Install bearing caps (1) and (2) on cylinder block (7) and secure with twenty capscrews (3).

Change 1

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2 - 1 5 . ENGINE DISASSEMBLY INTO SUBASSEMBLIES (Cont’d)

2-16. CYLINDER BLOCK REPAIR

This task covers:

a. Preinspection

c. Inspection

b. Cleaning

d. Repair

lNITIAL SETUP:

Tools

General mechanic’s tool kit:

automotive (Appendix E, Item 1)

Straightedge (Appendix E, Item 15)
Feeler gauge (Appendix E, Item 13)
Cylinder bore gauge (Appendix E, Item 14)
Micrometer (Appendix E, Item 16)
Cylinder boring machine

(Appendix E, Item 17)

Cylinder honing unit (Appendix E, Item 18)

Special Tools

Camshaft bearing remover and installer

(Appendix E, Item 12)

Materials/Parts

Six protective dust caps (Appendix D, Item 5)
Lubricating oil OE/HDO (Appendix B, Item 13)
Pipe sealing compound (Appendix B, Item 17)
Sealing compound, anaerobic (Appendix B,

Item 18)

Sealing compound, high temperature

(Appendix B, Item 21)

Manual References

Equipment Condition

Engine disassembled into subassemblies
(para. 2-15).

General Safety Instructions

Compressed air for cleaning purposes will not

exceed 30 psi (207 kPa).

Protective clothing must be used with steam

cleaning.

Wear eyeshields when using compressed air.

a. Preinspection

1. Inspect camshaft bearings (2) for chips, cracks, or scoring. If any bearing (2) is chipped, cracked,

or scored, remove all camshaft bearings (2) (para. 2-16.d.3) and hot tank clean cylinder block (1)
(para. 2-16.b.1).

2. Measure inside diameter of all camshaft bearings (2). Number one through number four camshaft

bearings must be 2.167-2.170 in. (55.041-55.118 mm) and number five camshaft bearing (rear)
must be 2.009-2.012-in. (51.028-51.104 mm). If any camshaft bearings (2) do not meet specifica-
tions, replace all camshaft bearings (2) (para. 2-16.d.3) and hot tank clean cylinder block (1)
(para. 2-16.b.1).

3. If all bearings (2) are to be reused, steam clean cylinder block (1) (para. 2-16.b.2).

b. Cleaning

1. Hot tank cleaning.

a. Remove six protective dust caps (3) and all plugs (4) from cylinder block (1).
b. Clean cylinder block (1) by submerging in tank of heated cleaning solution.
c. Run rods with brushes through all oil passages and repeat step 1.b.

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