GMC 1989 Light Duty Truck, Repair Manual, Page: 373 / 998

2.5 LITER L4 ENGINE 6A1-17
A. A rb o r Press
B. Press Tool
104. C a m s h a ft G e ar
105. T h ru s t Plate
108. C a m s h a ft
104
108
F-02027
Figure 29— Installing the Camshaft Gear
NOTICE: The thrust p la te m u st b e p o s itio n e d
so th at the w o o d ru ff key (1 0 7 ) does n o t dam age
it during the rem oval operatio n .
• Press the cam shaft (108) out of the camshaft
gear.
2. Thrust plate (105).
3. Spacer (106).
*
A ssem ble (Figure 29)
• Support the cam shaft on the back of the front
journal in an arbor press using press plate adapters.
• Lubricate the thrust plate with engine oil.
1. W oodruff key (107).
2. Spacer (106).
3. Thrust plate (105).
4. Camshaft gear (104).
• Make sure that the tim ing mark is to the
outside.
• Press the cam shaft gear onto the cam shaft
until it bottoms on the spacer (106).
• Remove the cam shaft from the press.
m
M easure (Figure 27)
Cam shaft to thrust plate clearance using a feeler
gage.The correct clearance is 0.0015-inch to 0.0050-
inch.
CAMSHAFT BEARINGS
0
* ± i R em ove or D isconnect (Figure 30)
Tool Required:
J 33049 Universal Cam shaft Bearing
Remover and Installer
1. Expansion plug.
• Drive out the plug from inside the block at the
rear camshaft bearing.
2. Front and rear bearings (109) using J 33049.
• Drive the bearings towards the center of the
block.
3. Center bearing using J 33049.
• Drive the bearing towards the rear of the
engine.
-►+ Install or C o nn ect (Figure 30)
Tool Required:
J 33049 Universal Cam shaft Bearing
Remover and Installer
1. Center bearing using J 33049.
• Install the bearing from the front of the engine.
• Make sure that the oil holes in the bearing are
aligned with the oil holes in the block.
2. Rear bearing (109) and expansion plug.
• Drive the bearing in from the rear of the
engine.
• Make sure that the oil holes in the bearing are
aligned with the oil holes in the block.
• Drive the expansion plug into the block from
the rear of the engine.
3. Front bearing (109).
• D riv e th e b e a rin g in to th e b lo c k , and
approximately 3.18 mm (Vs-inch) past the front
surface of the block. This uncovers the timing
gear oil nozzle hole.
FRONT COVER
*
*
Clean
Old RTV sealant from the sealing flange.
Inspect
Front cover for cracks, large dents, etc.
Sealing flange for straightness.
D isassem ble (Figure 5)
Seal (101). Pry the seal out with a screwdriver.
A ssem ble (Figure 31)
Tool Required:
J 34995 Crankshaft Front Cover
Oil Seal Installer
New seal (101) using tool J 34995.
— Support the inside of the front cover around
the seal bore area.