Thermostat Housing Removal; Water Pump Removal; Valve Train Component Removal - GMC 1989 Light Duty Truck Repair Manual

47. Water Pump Bypass Hose
50. Thermostat Housing
54. Water Outlet
171. Water Pump
Figure 11— Thermostat Housing and W ater Pump
Installed
• Remove the heat stove (191).
2. PC Vhose.
3. Bolts (35), nuts (30), washers (29) and clam ps (34).
4. Intake manifold (31) and exhaust manifold (37) as an
assembly.
5. Gasket (27).
THERMOSTAT HOUSING
REMOVAL
R em ove or D isconnect (Figures 4 and 11)
1. Bolts (51).
2. Thermostat housing (50).
3. Gasket (49).

WATER PUMP REMOVAL

R em ove or D isconnect (Figures 5 and 11)
1. Bolts (170).
2. Water pump (171).
3. Gasket (169).
A. 22 mm (7/a")
B. 55 mm (2-1 /a" )
C. 40 mm (1-V2" )
D. 10 mm (3/8" )drill
25 mm (1" )deep
Holes for Pushrods
E. 22 mm (7/s" ) drill
25 mm (1" )deep
Holes for Valve
Lifters
F. 50 mm x 155 mm
(2" x6" ) Lumber
G. 50 mm (2") pegs for
Rocker Arms
and Balls
B-05061
Figure 12— Valve Train Component Rack
COMPONENT REMOVAL
R em ove or D isconnect (Figures
and
Tools Required:
Figure 13— R em oving th e V alve Lifters
4.8 LITER L6 6A4-9
A B
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VALVE TRAIN
14)
J-3049 Valve Lifter Remover (Plier Type)
J-9290-01 Valve Lifter Remover
(Slide Hammer Type)
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F-04942
3, 4, 12, 13,