[miesk5]

YO Siggy,

Greatly misaligned pulleys.	CHECK for misalignment between adjacent pulleys.
	Drive belt not seated correctly (poly-V belt).	REPLACE drive belt and VERIFY correct seating.
	Pulley wobble.	VERIFY that no pulley wobbles during engine operation. Conditions causing wobble are: bent pulley, bent accessory shaft, rear face of pulley not seated flat against mating surface.
	Excessive crankshaft end play.	REBUILD engine.

 

[miesk5]

Yo Siggy,
This is as close as I can offer right now:
Removal, Belt in an 88 5.0; "...I tried an 89.5" first, 2 inches shorter than stock and it was too long. So I went back hoping for something about 88 or so and all they had was a 87.5. It was a bit short and a royal pita to put on but it is running fine. A lil tight but it should hold till I get an 88.2 which they can order." by fright88

Removal, Belt Part Number 882K6 in an 88 5.0 by Barbaric35

Removal, Belt Part Number in an 89 5.8; NAPA Belt Part # 060825*by Cucamongan (Scotty) at SuperMotors.net

 

[miesk5]

Yo Siggy,
Have you heard a chirping type noise?
"
A chirping noise from the accessory drive belt that is more noticeable at idle than at higher speeds may be caused by a power steering pump pulley (3A733) that is out of alignment.

The misaligned power steering pulley causes the accessory drive belt to chirp as the belt enters it on an angle on 4.9L engines, or after it leaves the power steering pump pulley, travels over the water pump pulley (8509) and enters into the crankshaft pulley (6312) on an angle on 5.0L and 5.8L engines. Verify that the chirping noise is coming from the entrance to one of these two pulleys by listening through a length of rubber hose or another stethoscope-like device.

If the chirp has been isolated to one of these pulleys, then correct this condition by aligning the power steering pump pulley using the following service procedure.

NOTE: Accessory drive belt chirp not corrected by this procedure may be caused by a damaged pulley or bent accessory shafts. Steady pulsation of the drive belt tensioner (6B209) indicates this condition. Observe each pulley in the system for runout.

1. CAUTION: Do not sand the edges of the drive belt or apply lubricants or dressings. These are only temporary fixes and may damage belt.
   Clean the accessory drive belt (8620) with mild soap and water to wash away oil or other contaminants.

1. On some models, it may be necessary to remove the fan shroud (8146) to allow for proper installation and operation of the power steering pulley puller and installer tools.

1. Using Steering Pump Pulley Remover T69L-10300-B and Steering Pump Pulley Replacer T65P-3A733-C set the power steering pump pulley hub to within ±.010 inch of being flush with the end of the power steering pump shaft.

1. CAUTION: Damaged accessory drive belts should be replaced before proceeding to Step 4. Only use a closed-end wrench to lift the drive belt tensioner to avoid possible damage. A wedged screwdriver will crack the pulley or the housing.
   Operate the engine (6007) at idle for five (5) minutes to see if chirping noise has been corrected. If not, proceed to Step 5.

1. Select a direction and move the power steering pump pulley at .50mm (.020 inch) increments in that direction. After each move (increment), remove the tool and operate the engine for five (5) minutes. If chirp fades, alignment is being achieved; if chirp increases, reverse the alignment direction. Continue moving the pulley until the noise is eliminated.

1. Reinstall the fan shroud."