Cylinder Head Removal; Torsional Damper Removal; Oil Pan Removal; Oil Pump Removal - GMC 1989 Light Duty Truck Repair Manual

6A4-10 4.8 LITER L6
Figure 14— Removing the Valve Lifters
1. Rocker arm cover (7).
• If the rocker arm cover adheres to the cylinder
head (26), try to shear the gasket by bumping
the end of the cover with a rubber mallet. If the
cover will not come loose, carefully pry until
loose. DO NOT DISTORT THE SEALIN G
FLANGE.
2. Nuts (11), balls (12), rocker arms (13) and pushrods
20
( ).
• Every effort should be made to insure that
these m ating parts are installed in th e ir
original locations during assembly. A simple
valve train component organizer rack can be
made from a piece of wood, as shown in figure
12
.
3. Bolts (178) and pushrod covers (179).
4. Gaskets (114).
5. Hydraulic lifters (100).
— Remove the lifters one at a time and place
them in the organizer rack. The lifters must be
installed in the same bore from which they
were removed.
— A stuck lifter can be removed using J-3049
(figure 13) or J-9290-01 (figure 14).
Figure 15— Removing the Torsional Damper

CYLINDER HEAD REMOVAL

□ Rem ove or D isconnect (Fig ure 4)
1. Bolts (21).
2. Cylinder head (26). Use care when handling the
B-05064
cylinder head to prevent damage to the gasket
surfaces.
3. Gasket (33).

TORSIONAL DAMPER REMOVAL

Rem ove or D isconnect (Figures 5 and 15)
+ +
Tool Required:
1. Bolt (160) and washers (159 and 161).
2. Torsional dam per (162). Use J-23523-E (figure 15).
R em ove or D isconnect (Figure 5)
1. Bolts (145).
2
. Oil pan (146).
3. Gaskets (142).
4. Front and rear oil pan seals (141 and 147).
+ + R em ove or D isconnect (Figure 5)
1. Bolt (164).
2. Front cover (157).
3. Gasket (166).
J-23523-E Torsional Damper
Remover/Installer

OIL PAN REMOVAL

OIL PUMP REMOVAL