Oil Pump Installation; Oil Pan Installation; Cylinder Head Installation - GMC 1989 Light Duty Truck Repair Manual

numbers on the connecting rod and bearing
cap must be on the same side when installed
in the cylinder bore. If a connecting rod is ever
transposed from one block or cylind er to
another, new connecting rod bearings should
be fitted and the connecting rod should be
numbered to correspond with the new cylinder
number.
3. Connecting rod cap with bearing insert.
M easure
Connecting rod bearing clearance. Refer to
GENERAL ENGINE MECHANICAL (SEC. 6A).
Tighten
• Connecting rod cap nuts to 53 N-m (39 ft. lbs.).
M easure
C onnecting rod side clearance (figure 36). The
proper clearance is 0.16 to 0.64 mm.

OIL PUMP INSTALLATION

0
+ ± l Install or C onnect (Figure 37)
1. Pump and shaft with retainer to the rear main
bearing cap.
• Align the top end of the hexagon extension
shaft with the hexagon socket on the lower
end of the distributor drive gear.
2. Bolt (40).
Tighten
• Bolt to 41 N-m.(30 ft. lbs.).

OIL PAN INSTALLATION

Clean
Sealing surfaces on the engine and oil pan.
Install or C onnect (Figure 38)
NOTICE: B efore installing the oil pan, ch eck
that the sealing surfaces on the pan, cylinder
case, a n d front co ver are clean an d free o f oil.
M ake sure that all RTV is rem oved from b lind
attaching holes.
1. Gasket.
• A p p ly s e a le r (GM Part No. 1052914 or
equivalent) to the area shown in figure 38.
2. Oil pan to the cylinder block.
3. Reinforcement (37), nuts, bolts, and studs.
Tighten
• Bolts (36) to 25 N-m (18 ft. lbs.).
• Bolts and studs (35) and nuts (38) to 10 N-m (7
ft. lbs.).
2.8 LITER V-6 6A2-23
Figure 36— Measuring Connecting Rod Side Clearance

CYLINDER HEAD INSTALLATION

>3* Clean
• Carbon deposits from combustion chambers.
• All traces of old head gasket from the cylinder head
and block.
• Cylinder head bolt threads and threads in the block.
1 ?
Inspect
• Sealing surfaces of the block and cylinder head for
nicks, heavy scratches, or other damage.
["►+[ Install or C onnect
1. Gasket in place over the dowel pins with the note
" This Side Up" showing.
2. Cylinder head.
• Gasket must be fully seated on the block
before head installation.
3. Head bolts.
• Coat the bolt threads with sealing compound
(GM part no. 1052080 or equivalent).
• Install all bolts finger tight.
A. F ro n t
40. B o lt
41. O il P um p
42. S h a ft
Figure 3 7 — Oil Pum p Installation
F-6523