GMC T Series 1994 Repair Manual page 524

70
69 268
h
46. COVER, FRONT CRANKCASE
48. POINTER, TIMING
49. SCREW, TIMMING POINTER
50. PLATE, COOLANT PUMP
52. GASKET, COOLANT PLATE
54. BOLT, COOLANT PUMP/PLATE
55. DAMPER, TORSIONAL
56. BOLT, TORSIONAL DAMPER
57. WASHER
58. BOLT/STUD
Figure 22 Front Cover and Components (Except
L57, VIN Y)
COOLANT PUMP REMOVAL
Remove or Disconnect (Figure 22)
1. Nuts (64).
2. Oil filler neck (63).
3. Bolts and studs (58).
4. Coolant pump (60) with coolant pump plate (50).
5. Bolts (72) holding the coolant pump and coolant
pump plate to the front crankcase cover.
6. Coolant pump (60) from the coolant pump plate
(50).
7. Gasket (52).
TORSIONAL DAMPER REMOVAL
Remove or Disconnect (Figures 22 and 23)
Tool Required:
J 39046 Torsional Damper Remover
J 23523-2 Screw
1. Bolt (56) and washer (57).
2. Torsional damper (55). Use J 39046 with J 23523-2
(figure 23).
IN JE C TIO N PUMP REMOVAL
Remove or Disconnect (Figures 24 and 25)
1, Wires and hoses at the injection pump.
2. Three bolts (238).
269 72
, PUMP, COOLANT
. TABLE, OIL FILL
. NUT
GROMMET
, BOLT/STUD
BOLT
BOLT
NUT
BAFFLE
SENSOR,
1
CRANKSHAFT
3706r5726
Figure 23— Removing the Torsional Damper
3. Injection pump gear (241).
4. Nuts (225) and throttle spring bracket (228).
5. Injection pump (244).
6. Gasket (242).
FRONT COVER REMOVAL
«■■+ Remove or Disconnect (Figure 22)
1. Crankshaft sensor (500) from front cover (46).
2. Oil pan to front cover bolts.
3. Bolts (268), nut (269).
4. Bolts (72).
5. Front cover (46).
TIM IN G CHAIN AND
SPROCKET REMOVAL
m
Measure
• Timing chain free play as follows:
1. Mount a dial indicator to the front of the block.
2. Position the dial indicator so that the plunger con­
tacts the timing chain between the two gears.
3. Pull the chain outward (parallel to the front face of
the block) the maximum amount with finger pres­
sure on the inside of the chain.
4. Set the dial indicator to zero.
5. Move the chain inward (parallel to the front face of
the block) the maximum amount with finger pres­
sure on the outside of the chain.
6. The total indicator travel can be noted. With used
parts, the deflection must not exceed 20.3 mm
(0.80 inch). If the deflection exceeds this limit, the
sprockets and timing chain must be replaced as an
assembly.
Remove or Disconnect (Figures 1 and 26)
1. Bolt (86) and washer (87).
2. Camshaft gear (88).
3. Camshaft sprocket (84) with timing chain (85).
4. Crankshaft sprocket (89).