GMC 1990 Light Truck Repair Manual page 402

6A1-28 2.5 LITER L4 ENGINE
A. Forward
B.
Apply A 1.5 mm
(Vi(,-lnch) Bead Of
RTV As Shown
113. Bearing
114.
Gear
115.
Shaft
117. Bolt
118. Plate
Figure 52—Oil Pump Drive Shaft
A. Apply Sealing Compound To Threads
On This Bolt
B. M ounting Surfaces Of Block Asm.,
Head Asm. And Both Sides Of
Gasket Must Be Free Of Oil And
Foreign Material
C. Forward
D. Dowel Pins
F-05717
Figure 53—Cylinder Head Installation
Cylinder head bolts should be washed in
solvent and dry at the time of installation. All
residual oil should be wiped from the cylinder
head mating surfaces.
Coat the threads of bolt 9 with sealing
com pound (Part Num ber
equivalent).
Apply a light coat of engine oil to the threads
and underside of the bolt heads of bolts 1
through 8.
Tighten
1. All head bolts to 25 N-m (18 ft. lbs.) in the
specified sequence (refer to figure 53).
2. All head bolts except number 9 to 35 N-m (26
ft. lbs.). Number 9 bolt should be tightened to
25 N-m (18 ft. lbs.). Tighten the bolts in the
specified sequence.
• Draw a line across the head of each bolt with a
marking crayon to mark the position of each
bolt.
3. All head bolts, 90 degrees (A U turn). Tighten
the bolts in the specified sequence.
1052080 or
F-05516