Valve Adjustment - Chevrolet 1991 Light Duty Truck Repair Manual

Sequence (5.0L and 5.7L Engines)
pushrods are longer than the intake valve push-
rods.
• Coat the mating surfaces of the rocker arms (42)
and balls (41) with " Moly Kote" or equivalent.
3. Pushrod guides (260), 7.4L engines only.
4. Rocker arms.
5. Balls.
6. Nuts, on 5.0L and 5.7L engines or bolts on 7.4L
engines.
| ^ j ] Tighten
• Bolts to 54 N-m (40 ft. lbs.), 7.4L Engines only.
5.0L and 5.7L ENGINES
Figure 79 Intake Manifold (7.4L Engines)
—
V8 ENGINES 6A5-35

VALVE ADJUSTMENT

1. Remove the rocker arm covers.
2. Crank the engine until the mark on the torsional
damper lines up with the center or "0" mark on
the timing tab (figure 75). The engine must be in
the number one firing position. This may be deter­
mined by placing fingers on the number one cylin­
der's valves as the mark on the damper comes
near the "0" mark on the crankcase front cover. If
the valves are not moving, the engine is in the
number one firing position. If the valves move as
the mark comes up to the timing tab, the engine is
in the number six firing position and should be
turned over one more time to reach the number
one position.
3. With the engine in the number one firing position
as determined above, the following valves may be
adjusted:
— Exhaust - 1, 3, 4, 8
— Intake - 1, 2, 5, 7
(Even numbered cylinders are in the right bank;
odd numbered cylinders are in the left bank, when
viewed from the rear of the engine.)
4. Back out the adjusting nut until lash is felt at the
pushrod then turn in the adjusting nut until all lash
is removed. This can be determined by rotating the
pushrod while turning the adjusting nut (figure 76).
When the play has been removed, turn the adjust­
ing nut in as follows:
— 5.0L and 5.7L engines: One full turn.
F9330