Timing Chain-Sprocket-Gear Installation - Hummer H1 Service Manual

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CONVERTER BOLT PADS
FLYWHEEL
BOLTS (6)
CRANKSHAFT
FLANGE
CYLINDER BLOCK
Figure 2-165: Flywheel Installation
CAMSHAFT INSTALLATION
1. Place engine in upright position so cam bearing bores are
vertical.
2. Lubricate camshaft bearing journals with engine oil. Then
lubricate cam bearings with long nozzle oil can.
3. Lubricate camshaft lobes with assembly lube.
4. Install 8-10 in. (20 -25 cm) long bolt or threaded rod on
cam sprocket bolt hole. Bolt will serve as handle and make
cam installation easier.
5. Install camshaft. Lower and guide cam carefully through
and into bearings (Figure 2-166).
6. Lubricate and install camshaft spacer and thrust plate.
Beveled edge of spacer faces toward cam.
7. Apply 1-2 drops Loctite 242 to thrust plate bolt threads.
Then install and tighten bolts 17 lb-ft (23 N•m) torque.
8. Remove bolt or rod from camshaft.
BOLTS (2)
Figure 2-166: Camshaft Installation
05745159

TIMING CHAIN-SPROCKET-GEAR INSTALLATION

FLYWHEEL
1.
2.
3.
THRUST PLATE
SPACER
4.
CAM LOBES
5.
CAM JOURNALS
6.
7.
6-S02-075
8.
Rotate crankshaft so #1 piston is at TDC.
Install sprocket drive keys in camshaft and crankshaft
(Figure 2-167).
TIMING MARK
LOCATIONS
CRANKSHAFT
SPROCKET
DRIVE KEYS
Figure 2-167: Timing Chain - Sprocket -
Gear Installation
Place block in upright position so cam is facing up. Then
rotate camshaft so drive key is toward top of block.
Assemble timing chain and sprockets. Make sure sprocket
timing marks are aligned as shown (Figure 2-167).
Align sprockets with drive keys in crankshaft and
camshaft. Then install chain and sprockets as assembly
(Figure 2-167). Turn camshaft to align sprockets if
necessary. Do not turn sprockets.
Check chain deflection with dial indicator. If deflection is
greater than 0.51 in. (13 mm), chain is stretched and will
have to be replaced.
Install injection pump drive gear, thrust washer, flat
washer (if equipped), and bolt (Figure 2-167). Tighten bolt
to 126 lb-ft (171 N•m) torque. Apply 1-2 drops Loctite
242 to bolt threads before installation. Position gear so
timing marks is at 12 o'clock position.
Lubricate chain, sprockets, and gear with engine oil.
Engine 2-85
THRUST WASHER
AND BOLT
INJECTION
PUMP
DRIVE
GEAR
CAMSHAFT
SPROCKET
TIMING
SPROCKET
CHAIN
6-S02-075