Pushrod, Rocker Arm And Shaft Installation - Hummer H1 Service Manual

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2-90 Engine
GLOW PLUG AND INJECTION NOZZLE
INSTALLATION
1. Install glow plugs in each cylinder head (Figure 2-178).
Tighten plugs to 8-12 lb-ft (11-16 N•m).
Figure 2-178: Glow Plug Installation
2. Install gasket on each injector nozzle (Figure 2-179).
3. Install injector nozzles in cylinder heads finger tight.
4. Tighten nozzles to 44-60 lb-ft (60-81 N•m) torque with
installer tool J–29873.
5. Connect return hoses between nozzles and install hose
clamps.
6. Install plug on rear nozzle and install hose clamp.
GASKET
Figure 2-179: Fuel Injector Nozzle Installation
GLOW PLUG
INJECTOR NOZZLE
HOSE CLAMPS
PLUG
RETURN HOSES
PUSHROD, ROCKER ARM AND SHAFT
INSTALLATION
NOTE: The rocker arm end of each pushrod is identified with
a paint stripe. In addition, the ball at this end of the pushrod is
heat treated/coated giving it a distinctive color. Be sure the
pushrods are installed with the correct end up and toward the
rocker arm.
1. Insert pushrods in roller lifters. Verify that all pushrods are
correctly installed.
2. Index crankshaft and pistons for rocker arm shaft
installation as follows:
a. Position breaker bar and socket on crankshaft damper
bolt. Do not use starter to rotate crankshaft. Turn shaft
with hand tools only.
b. Rotate crankshaft counterclockwise, and align mark
on torsional damper with "O" mark on front cover
timing tab (Figure 2-180).
c. Rotate engine counterclockwise an additional 3 1/2
inches (89 mm), measured at mark on torsional
damper. Damper mark should align with water pump
first, lower attaching bolt at this point (Figure 2-176).
3. Align and install rocker arm and shaft assemblies
(Figure 2-181). Be very sure pushrods are seated in lifter
and in rocker arms. Also be sure rocker arm retainers are
in place and seated.
4. Install rocker arm shaft retainers and bolts. Tighten bolts
in small increments until snug, with socket and ratchet or
nut runner.
CAUTION: Do not use an air wrench to tighten the bolts. In
addition, stop tightening if the bolts become hard to turn be-
fore they are seated. If this condition occurs, the crankshaft
and pistons are not properly indexed, allowing the valves to
contact the pistons.
5. Verify that pushrods are properly seated in rocker arms
and lifters. Then final-tighten rocker arm shafts bolts to
41-lb-ft (56 N•m) torque.
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