Question about 1991 GMC Sierra

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I can't get the timing sprocket off of the motor

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I had the same problem, if you take a balancer puller and run 2 bolts through it with nuts on the end and place the bolts between the teeth on the sprocket you can pull it off. Make sure to take your time!

Posted on Sep 18, 2008

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For The 3.0 Motor. (3.3 Way down the line.)

Drain cooling system.
Remove timing belt. Refer to Engine for procedure.
Remove water pump mounting bolts.
Separate pump from water inlet pipe and remove water pump.

Timing Belt Removal
Raise vehicle and remove accessory drive belt splash shield (Fig. 66).
Remove accessory drive belts.
Remove crankshaft pulley and damper (Fig. 68).
Support engine and remove right side engine mount.
Remove engine support bracket (Fig. 67).
Remove timing belt covers (Fig. 67).
Mark belt running direction for installation (Fig. 69).
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Remove crankshaft sprocket flange shield (Fig. 68). CAMSHAFT SPROCKETS To remove camshaft sprockets
Hold camshaft sprocket with Spanner Tool MB-990775. Loosen and remove bolt and washer (Fig. 70).
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Place camshaft sprocket on camshaft.
Install bolt and washer to camshaft. Using Spanner Tool MB-990775, hold camshaft sprocket and torque bolt to 95 Nm (70 ft. lbs.) (Fig. 70). TIMING BELT TENSIONER
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INSTALLATION


Install timing belt on crankshaft sprocket and keep belt tight on tension side (Fig. 69). Install belt on the front (radiator side) camshaft sprocket. Install belt on the water pump pulley, rear camshaft sprocket and finally on the timing belt tensioner.
Rotate the front camshaft sprocket in opposite direction to take up belt slack. Check that all timing marks are aligned (Fig. 69).
Install crankshaft sprocket flange (Fig. 68).
Loosen tensioner bolt and allow spring to tension timing belt.
Turn crankshaft two full turns in clockwise direction. Turn smoothly and in clockwise direction ONLY.
Align the timing marks on the sprockets and tighten the timing belt tensioner locking bolt to 28 Nm (250 in. lbs.) torque.
Install timing belt covers.
Install engine support bracket.
Install right side engine mount.
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Remove accessory drive belt.
Remove right front lower fender shield.
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Install water pump to chain case cover. Tighten screws to 12 Nm (105 inch lbs.) .
Rotate pump by hand to check for freedom of movement.
Position pulley on pump. Install screws and tighten to 30 Nm (250 inch lbs.) .
Install accessory drive belt.
Install right front lower fender shield.
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Raise vehicle on a hoist. Remove right inner splash shield.
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Remove right engine mount bracket.
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Hold camshaft sprocket with Special tool C-4687 and adaptor C-4687-1 while removing bolt. Remove both cam sprockets.
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Install new O-ring gasket in water pump body O-ring groove. CAUTION: Make sure O-ring is properly seated in water pump groove before tightening screws. An improperly located O-ring may cause damage to the O-ring and cause a coolant leak.
Assemble pump body to block and tighten screws to 12 Nm (105 inch lbs.) . Pressurize cooling system to 15 psi with pressure tester and check water pump shaft seal and O-ring for leaks.
Rotate pump by hand to check for freedom of movement.
Install rear timing belt cover.
Install camshaft sprockets and torque bolts to 101 Nm (75 ft. lbs.) .
Install timing belt idler pulley and torque mounting bolt to 61 Nm (45 ft. lbs.) .
Install timing belt. Refer to Engine for procedure.
Install right engine mount bracket and engine mount. Refer to Engine for procedure.
Fill cooling system.
Install accessory drive belts.
Lower vehicle and connect battery cable.

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86092467
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