Front Cover Removal - Hummer H1 Service Manual

____________________________________________________________________
®

Front Cover Removal

1. Remove baffle from front cover (Figure 2-87).
2. Remove bolts attaching front cover to oil pan.
3. Remove bolts attaching front cover to engine block.
4. Remove front cover. Use mallet to loosen cover. Do not
pry cover loose.
5. Remove oil seal from cover.
BAFFLE
COVER OIL SEAL
Figure 2-87: Front Cover and Baffle Removal
Timing Chain, Drive Sprockets, Drive Gear
Removal
1. Measure timing chain deflection. Deflection must not exceed
0.810 in. (21 mm). Use dial indicator J–8001 (Figure 2-89).
2. Measure camshaft end play. End play should not exceed
0.012 in. (0.3 mm). If end play exceeds 0.012 in. (0.3
mm), camshaft sprocket, thrust plate, or spacer is worn
and will have to be replaced.
3. Remove injection pump drive gear bolt and remove drive
gear from camshaft.
4. Remove crankshaft sprocket, camshaft sprocket, and
timing chain as assembly (Figure 2-88).
05745159
CYLINDER BLOCK
FRONT
OIL PAN
COVER
INJECTION PUMP
DRIVE GEAR
CRANKSHAFT
TIMING CHAIN
CAMSHAFT SPROCKET
CRANKSHAFT
SPROCKET
Figure 2-88: Timing Chain, Drive Sprocket,
Drive Gear Removal
5. Remove drive keys from camshaft and crankshaft.
DIAL
INDICATOR
J8001
CHAIN
Figure 2-89: Measuring Timing Chain Deflection
Oil Filter, Adapter, and Oil Pressure Sending
Unit Removal
1. Remove oil filter from adapter (Figure 2-89). Discard oil
filter.
2. Remove adapter bolt, washer, seals and adapter.
3. Unplug electrical connector and remove oil pressure
sending unit from engine valley (Figure 2-91).
Engine 2-57
DRIVE KEYS
CAMSHAFT