Hummer H1 (1992-1998). Manual - part 50

2-41. ENGINE ASSEMBLY FROM SUBASSEMBLIES (Cont’d)

e. Camshaft

1. Rotate cylinder block (7) 180°.

2. Apply OE/HDO to all bearing journals (12) and cam lobes (11) on camshaft (13).

CAUTION

Support camshaft during installation to prevent damage to
camshaft bearings.

3. Install camshaft (13) into cylinder block (7).

NOTE

Beveled edge of spacer must seat against front bearing journal
on camshaft.

4. Install spacer (10) and camshaft thrust plate (9) with two capscrews (14). Tighten capscrews (14) to

18 lb-ft (24 N•m).

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2-41. ENGINE ASSEMBLY FROM SUBASSEMBLIES (Cont’d)

f. Timing Chain and Drive Sprockets

1,

2.

3

<

4.

5.

6.

7.

Install woodruff key (7) in camshaft (6) and woodruff key (8) in crankshaft (9).

Install crankshaft sprocket (10) and camshaft sprocket (4) in timing chain (5) and align timing
marks (11).

Rotate crankshaft (9) and camshaft (6) so woodruff keys (7) and (8) align with keyway slots in
crankshaft sprocket (10) and camshaft sprocket (4).

CAUTION

Timing marks on crankshaft sprocket and camshaft sprocket must
remain aligned after installation or engine damage may result.

Install crankshaft sprocket (10), camshaft sprocket (4), and timing chain (5) as an assembly onto
camshaft (6) and crankshaft (9).
Install pump drive gear (3) on camshaft (6) with washer (2) and capscrew (1). Tighten capscrew (1)
to 55-66 lb-ft (75-90 N•m).

Apply OE/HDO to timing chain (5).

NOTE

Perform step 7 only if timing chain was replaced.

Check timing chain deflection midway between camshaft sprocket (4) and crankshaft sprocket (10).
Total deflection must not exceed 0.5 in. (12.7 mm). If deflection exceeds specification, inspect cam-
shaft sprocket (4) and crankshaft sprocket (10) for 

damage. Replace either 

if damaged and recheck

deflection.

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2-41. 

ENGINE ASSEMBLY FROM SUBASSEMBLIES 

(Cent’d)

 g. Timing Gear Cover 

1.

2.

3.

4.

5.

Install front cover seal (19) in timing gear cover (15), ensuring lip of seal (19) faces inward.

Apply a 3/32 in. (2 mm) bead of sealer to sealing surface on timing gear cover (15), following diagram

shown.
Install timing gear cover (15) on cylinder block (16) with four washers (17), capscrews (18), and short
capscrews (20). Tighten four capscrews (18) and short capscrews (20) to 33 lb-ft (45 N•m).

CAUTION

Maintain 0.040 in. (1.02 mm) minimum clearance between baffle
plate and pump drive gear to avoid noise.

Install baffle plate (14) in timing gear cover (15) with two capscrews (12) and nut (13). Tighten
capscrews (12) and nut (13) to 33 lb-ft (45 N•m).

NOTE

Perform step 5 for 6.5L engines.

Install rpm sensor (22) in timing gear cover (15) with capscrew (21).

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2-41. ENGINE ASSEMBLY FROM SUBASSEMBLIES (Cont’d)

1.

2.

3.
4.

5.

6.

Rotate cylinder block (9) 180°.
Install oil pan rear seal (7) in rear main cap (8) and apply a drop of silicone sealant at each end of
seal (7).

NOTE

● 

Install oil pan immediately after application of sealant.

● 

If applying silicone sealant, perform step 4.

● 

If installing new engine oil pan gasket, perform step 3.

● 

Silicone sealant can be applied with the gasket, but is not required.

Install engine oil pan gasket (11) on oil pan sealing surface (12) and align with capscrew holes.

Apply a 3/16 in. (5 mm) bead of silicone sealant around two large holes (10) on cylinder block (9).
Apply a 3/16 in. (5 mm) bead of silicone sealant around oil pan sealing surface (12), following

diagram shown.
Install oil pan (5) on cylinder block (9) with twenty capscrews (1), two studs (4), and two large
capscrews (6). Tighten studs (4) and capscrews (1) to 48-120 lb-in. (5-14 N•m) and capscrews (6) to
156-240 lb-in. (18-27 N•m).
Install drainplug (2) and washer (3) in oil pan (5). Tighten drainplug (2) to 20 lb-ft (27 N•m).

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