Valve Train Component Removal - GMC 1990 Light Truck Repair Manual

110. B oll
111. C oolant Pump
112. Gasket
Figure 8—Water Pump
VALVE TRAIN COMPONENT
REMOVAL
Tools Required:
J 34144-A Rocker Arm Cover Remover
J 3049 Valve Lifter Remover (Plier Type)
Remove or Disconnect (Figures 2, 3, 9 ,1 0 , 11,
and 12)
1. Rocker arm cover bolts.
J-34144-A
J-34144-A
Figure 9—Removing the Rocker Arm Cover
A. 22 mm (7/s")
B. 55 mm (21 /s")
C. 40 mm (11 /2")
D. 10 mm {3/s")
110
F-01987
E. 22 mm (7/s") Drill
F. 50 mm x 155 mm
G. 50 mm (2") Pegs for
F-04483
2.5 LITER L4 ENGINE 6A1-9
25 mm (1") Deep
Holes for Pushrods
25 mm (1") Deep
Holes for Valve
Lifters
(2" x 6") Lumber
Rocker Arms
and Balls
Figure Valve Train Component Rack
1 0 —
2. Rocker arm cover. Use J 34144-A (figure 9).
3. Bolts (31), balls (32), rocker arms (33), pushrods (47)
and pushrod guides (45).
• Every effort should be made to insure that
these mating parts are installed in their
original locations during assembly. A simple
valve train component organizer rack can be
made from a piece of wood, as shown in figure
10
.
4. Pushrod cover nuts, studs, and the cover (50).
• Unscrew the four nuts from the cover
attaching studs, reverse two of the nuts so the
washers face outward and screw them back
onto the inner two studs. Assemble the two
remaining nuts to the same two inner studs
with washers facing inward. Using a small
wrench on the inner nut, on each stud, jam the
two nuts tightly together. Again, using the
small wrench on the inner nut, unscrew the
studs until the cover breaks loose.
• After breaking the cover loose, remove the
jammed nuts from each stud. Remove the
cover from the studs.
5. Retainers (123).
6. Hydraulic lifter guides (122).
7. Hydraulic lifters.
• Remove the valve lifters one at a time and
place them in the organizer rack. The valve
lifters must be installed in the same bore from
which they were removed.
• A stuck valve lifter can be removed using
J 3049.
F-01988