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

6A4-28 4.8 LITER L6
• With the connecting rod cap removed, install
J-5329 onto the connecting rod studs (69).
• Locate the piston ring end gaps as shown in
figure 87. Lubricate the piston and rings (101,
102, and 105) with engine oil.
• Locate the ring end gaps as shown in figure
54.
• W ithout disturbing the ring end gap location,
install J-8037 over the piston (figure 55).
• The piston must be installed so that the piston
crown d epression's flat side faces to the
engine's left side (figure 56).
• Place the piston in its matching bore. Using
light blows with a hammer handle, tap the
piston down into its bore (figure 55). At the
same time, guide the connecting rod into
piston on the crankpin, using the J-5329
Guide Tool. Hold the ring compressor against
the block until all rings have entered the
cylinder bore.
3. C on ne cting rod cap (110) w ith the lower
connecting rod bearing insert.
A. Front of Engine
B. Flywheel Side of Engine
C. Piston Depression Flat Side
Figure 5 6 — Pistons Installed
M easure
• Connecting rod bearing clearance. Refer to
GENERAL ENGINE MECHANICAL (SEC. 6A).
Then apply engine oil to the connecting rod
bearing.
4. Nuts (111).
Tig h ten
• Nuts (111) to 80 N-m (60 ft. lbs.).
t j j
• Connecting rod side clearance. Use a feeler

OIL PUMP INSTALLATION

Install or C onnect (Figure 5)
+ 4 -
1. Oil pump (151).
2. Bolts (148) and nut (149).
• Bolts (148) to 13.0 N-m (115 in. lbs.).
• Nut (149) to 34 N-m (26 ft. lbs.).

OIL PAN INSTALLATION

Install or C onnect (Figure 5)
1. Rear oil pan seal (141).
2. Front oil pan seal (147).
3. Gaskets (142).
4. Oil pan (146).
5. Bolts (145).
—
—
B-05256
—
M easure (Figure 57)
g a g e . T he p ro p e r
0.006-0.017-inch.
T ig h ten
T ighten
1 /4-20 bolts to 9.0 N-m (80 in. lbs.).
5/ i 6-18 bolts (except oil pan [146] to front cover
[157] bolts) to 18.6 N-m (165 in. lbs.).
Oil pan (146) to front cover (157) bolts to 5.1
N-m (45 in. lbs.).
c le a ra n c e is