Main Bearing Installation (Without Removing The Crankshaft); Camshaft Installation; Front Cover Installation - GMC 1990 Light Truck Repair Manual

6A1-24 2.5 LITER L4 ENGINE
MAIN BEARING INSTALLATION
(WITHOUT REMOVING THE
CRANKSHAFT)
Install or Connect (Figures 5 and 42)
Tool Required:
J 8080 Main Bearing Remover/Installer
1. Upper main bearing inserts.
• Insert tool J 8080 into a crankshaft main
bearing hole.
• Apply engine oil to the proper sized inserts.
• Insert the plain end of the insert (without the
bearing tang) of the insert between the
crankshaft and the notched side of the block.
• Rotate the crankshaft to " roll" the insert into
the block.
• Remove the tool.
2. Lower main bearing inserts to the main bearing
caps.
• Make sure the inserts are of the proper size.
• Apply engine oil to the inserts.
Measure
m
Main bearing clearance and crankshaft end
play. Refer to " Crankshaft and Main Bearing
Installation" in this section.

CAMSHAFT INSTALLATION

■H" Install or Connect (Figure 3, 43, and 44)
• Coat the cam shaft lobes with E ngine Oil
S upplem e nt (GM part num ber 1051396) or
equivalent. Coat the bearing journals with engine
oil.
1. Camshaft (108) into the block (119). Take care not to
damage the camshaft bearings (109).
104 108
105
Tim ing Marks
Crankshaft Gear
Thrust Plate Bolts
Camshaft Gear
Thrust Plate
Camshaft
Figure 43—Camshaft and Timing Gears
9
Important
• Align the timing marks.
2. Screws (103).
$ Tighten
S c r e w s (103) to 9.0 N m (8 0 in. lbs.).
FRONT COVER
INSTALLATION
Install or Connect (Figures 5, 45 and 46)
Tool Required:
J 34995 Crankshaft Front Cover
Oil Seal Installer
1. Tool J 34995 into the front cover seal.
• Apply a 10 mm (3 /s-inch) wide by 5 mm (3 /ie-inch)
thick bead of RTV sealer to the oil pan at the timing
gear cover sealing surface.
• Apply a 6 mm (1 /4-inch) by 3 mm (Vs-inch) thick bead
of RTV to the timing gear cover at the block sealing
surface. Refer to figure 45.
NOTICE: The correct tool must be used to align
the tim ing gear cover so that the front
crankshaft seal is properly centered around the
crankshaft. The seal must be centered to
prevent damage during hub installation.
2. Timing gear cover, with J 34995 in place, to the
block.
F-05719