GMC T Series 1994 Repair Manual page 553

2. Cylinder head. Make sure the gasket surfaces are
clean. Guide the head carefully into place over the
dowel pins.
N O T IC E : R e f e r to " N o t i c e " o n p a g e 6 A 7 -1 .
3. Head bolts.
A. Make sure the bolt threads are clean.
B. Apply sealant (GM P/N 1052080) or equivalent
to the bolt threads and under the bolt heads.
& Tighten
A. Head bolts.
B. Using the sequence shown in figure 77,
tighten all bolts to 25 N-m (20 lbs. ft.).
C. In sequence, tighten all bolts to 65 N-rn (50
lbs. ft.).
D. In sequence, tighten all bolts an additional
90 degrees (1/4 turn).
4. J 29664-1 to the intake ports.
PUSHROD AND ROCKER ARM
INSTALLATION
-► 4-
Install or Connect (Figures 68 and 78)
N O T IC E : T h e p u s h r o d s m u s t b e in s t a lle d w ith
t h e m a r k e d o r p a i n t e d e n d u p . F a ilu r e to d o
s o m a y r e s u lt in d a m a g e o r p r e m a t u r e w e a r.
Figure 76— Oil Pan and Oil Pump
1. Pushrods, with the painted or marked end up.
2. Rocker arm shaft assembly. Make sure the ball
ends of the pushrods seat in the rocker arms.
N O T IC E : Im p r o p e r in s ta lla t io n o f t h e r o c k e r
a r m s h a f t b o lts m a y c a u s e r o c k e r a r m s h a f t
b r e a k a g e a n d /o r p is t o n to v a lv e c o n ta c t .
N O T IC E : R e f e r to " N o t i c e " o n p a g e 6 A 7 -1 .
3. Bolts (194).
Figure 77— Head Bolt Tightening Sequence
A. Rotate the engine until the mark on the torsion­
al damper aligns with the " 0" mark on the tim­
ing tab.
B. Rotate the engine counterclockwise 88 mm (3
1/2 inches), measured at the torsional damper.