GMC T Series 1994 Repair Manual page 495

40. Bolt
41. Ball
42. Rocker Arm
43. Pushrod
44. Hydraulic Lifter
46. Cylinder Head
260. Pushrod Guide
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 posi­
tion.
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 the left bank; odd
numbered cylinders are the right bank, when
viewed from the front of the engine.)
0 ^ 0 0
0 0 0 0 0 0 0
Figure 90— Cylinder Head Bolt Tightening
Sequence (5.0L and 5.7L Engines)
Figure 89— Valve Train Components (7.4L Engines)
.. . ^
0 0
B9572
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 93).
When the play has been removed, turn the adjust­
ing nut in as follows:
• 5.0L and 5.7L engines: One full turn.
5. Crank the engine one revolution until the pointer
"0" mark and torsional damper mark are again in
alignment. This is the number six firing position.
With the engine in this position the following valves
may be adjusted:
• Exhaust - 2, 5, 6, 7
• Intake - 3, 4, 6, 8
Figure 91—Cylinder Head Bolt Tightening
Sequence (7.4L Engines)
F9325
B9570