Chevrolet 1988 Light Duty Truck Repair Manual page 380

6A1-28 2.5 LITER L4 ENGINE
A. Forward
B. A p p ly A 1.5 m m
( ' / ui-lnch) Bead Of
RTV As S h o w n
113. B ea rin g
114. Gear
115. S haft
117. B olt
118. Plate
Figure 5 2 - O il Pump Drive Shaft
A. A p p ly S e a lin g C o m p o u n d To T h re a d s
On T h is B o lt
B. M o u n tin g S u rfa c e s O f B lo c k A s m .,
H ead A s m . A n d B o th S id e s O f
G a s k e t M u s t Be Free O f O il A n d
F o re ig n M a te ria l
C. F o rw a rd
D. D o w e l P in s
F-05717
Figure 53— Cylinder Head Installation
• C ylinder head bolts should be w ashed in
solvent and dry at the tim e of installation. All
residual oil should be wiped from the cylinder
head mating surfaces.
• C o at the th re a d s of b o lt 9 w ith s e a lin g
c o m p o u n d (P a rt N u m b e r
equivalent).
• Apply a light coat of engine oil to the threads
and underside of the bolt heads of bolts 1
through 8.
T ig h ten
1. All head bolts to 25 N m (18 ft. lbs.) in the
specified sequence (refer to figure 53).
2. All head bolts except num ber 9 to 35 N m (26
ft. lbs.). Num ber 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
m arking crayon to mark the position of each
bolt.
3. All head bolts, 90 degrees (1 /4 turn). Tighten
the bolts in the specified sequence.
1 0 5 2 0 8 0 o r
F-05516