Intake Manifold Removal; Exhaust Manifold Removal; Thermostat Housing Removal; Water Pump Removal - GMC 1989 Light Duty Truck Repair Manual

6A1-6 2.5 LITER L4 ENGINE
50. Push Rod Cover
51. Piston and Pin
52. Piston Rings
53. Connecting Rod
54. Connecting Rod Bolt
55. Connecting Rod Bearings
56. Connecting Rod Nut
57. Oil Level Indicator
58. Oil Level Indicator Tube
59. Seal
60. Guide Retainer Stud
61. Plug
62. Plug
63. Pin
64. Block Drain Bolt
65. Timing Indicator Stud
66. Bolt
67. Flywheel
68. Spacer
69. Clutch Pilot Bearing
70. Crankshaft Insert
71. Crankshaft Rear Oil Seal
72. Crankshaft Rear Bearing
73. Oil Pan Drain Screw
74. Gasket
75. Bolt
76. Oil Pan

INTAKE MANIFOLD REMOVAL

R em ove or D isconnect (Figure 6)
1. Vacuum lines and electrical connectors, as needed.
2. Intake manifold bolts and washers.
3. Intake manifold.
4. Gasket.

EXHAUST MANIFOLD REMOVAL

R em ove or D isconnect (Figure 7)
1. Thermae heat stove pipe at the exhaust manifold.
2. Oxygen sensor wire. Remove the oxygen sensor
only if the exhaust manifold is to be replaced.
3. Exhaust manifold bolts and washers.
4. Exhaust manifold and gasket.
77. O il P um p
78. N u t
79. Pin
80. S p rin g
81. B o lt
82. O il P um p C over
83. O il P um p C over G a sket
84. B o lt
85. O il P ressure R e g u la to r Valve
86. C ra n k s h a ft B e a rin g s
87. C ra n k s h a ft G ear
88. C ra n k s h a ft
89. Key
90. T im in g In d ic a to r
91. O il P um p S h a ft L ow er
B e aring
92. Plug
93. T im in g G ear O il N ozzle
94. B o lt
95. C ra n k s h a ft P ulley
96. B o lt
97. C ra n k s h a ft and P ow er S te e rin g
P ulley
98. B o lt
99. W a sh er
100. C ra n k s h a ft P ulley H ub
101. F ro n t C ove r Seal
Figure 4— Block and Components
4- +
+ +
102. F ro n t C over
103. S crew
104. C a m s h a ft G ear
105. C a m s h a ft T h ru s t B e aring
106. C a m s h a ft G ear S p a c in g R ing
107. Key
108. C a m s h a ft
109. C a m s h a ft B e aring
110. B o lt
111. C o o la n t P um p
112. G a sket
113. O il P um p S h a ft U p p e r B earing
114. O il P um p D rive S h a ft G ear
115. O il P um p D rive S h a ft
116. C o n n e c tin g Rod C ap
117. B o lt
118. O il P um p D rive S h a ft C over
Plate
119. B lo c k
120. C y lin d e r H ead D ow el Pin
121. H y d ra u lic R o lle r L ifte r
122. Valve L ifte r G u id e
123. L ifte r G u id e R e ta in e r
124. M ain B e a rin g C ap
125. B o lt
126. Rear M ain B e a rin g Cap
THERMOSTAT HOUSING
REMOVAL
Rem ove or D isconnect (Figure 5)
1. Thermostat bypass hose.
2. Thermostat housing bolts.
3. Thermostat housing and gasket.

WATER PUMP REMOVAL

R em ove or D isconnect (Figure 8)
1. Fan and fan clutch.
2. Water pump pulley.
3. Bolts.
4. Water pump.
5. Gasket.
F-01982