Well, these are the pages from the '96 Ford Probe Service Manual on belt
tension (minus the illustrations).
I had a similar problem, returning two or three times to the shop that
replaced the belt. The squeal was intermittent but it got so loud and it
drove me nuts in the morning when I started the car, so I took it into a
Ford dealer service shop. They tightened the belt to spec and the noise
disappeared.
So here is the information direct from Ford. Hope it helps.
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Drive Belt Tension Adjustment
Drive Belt -- Generator
Tension Adjustment
1. Place the belt tension gauge at a point midway between two pulleys and
measure the tension.
2. Note: A drive belt (8620) is considered new if it has been used on a
running engine for less than five minutes.
The tension for the drive belt (with or without A/C) should measure
690-880
N (160-190 lb) for a new belt, 500-680 N (110-150 lb) for a used belt. The
limit for belt tension is 440 N (99 lb).
Deflection Adjustment -- Without A/C
1. Note: Always check the belt deflection when the engine is cold, or has
been stopped for at least 30 minutes. A drive belt is considered new if it
has been used on a running engine for less than five minutes.
Apply 98 N (22 lb) of pressure to the generator drive belt at a point
midway between the generator and the crankshaft pulley.
2. The generator belt deflection should measure 6.0-7.0mm (0.24-0.27 inch)
for a new belt, 7.0-8.0mm (0.28-0.31 inch) for a used belt. The limit of
deflection is 9.0mm (0.35 inch).
Deflection Adjustment -- With A/C
1. Note: Check the generator belt for cracks, wear, or fraying. Replace if
necessary. Ensure that the belt is properly installed on each pulley.
Note: Always check the belt deflection when the engine is cold, or has
been
stopped for at least 30 minutes. A generator belt is considered new if it
has been used on a running engine for less than five minutes.
Apply 98 N (22 lb) of pressure to the generator belt at a point midway
between the A/C clutch pulley (2E884) and the crankshaft pulley.
2. The generator and A/C compressor belt deflection should measure
5.5-6.5mm
(0.22-0.25 inch) for a new belt, 6.5-7.5mm (0.26-0.32 inch) for a used
belt.
The limit of deflection is 8.0mm (0.32 inch).
Drive Belt -- Power Steering Pump and Water Pump
Tension Adjustment
1. Place the belt tension gauge at a point midway between two pulleys and
measure the tension.
2. Note: A drive belt is considered new if it has been used on a running
engine for less than five minutes.
The tension for the drive belt should measure 550-680 N (130-150 lb) for
a
new belt and 400-530 N (88-120 lb) for a used belt. The limit for belt
tension is 340 N (77 lb).
Deflection Adjustment
1. Note: Always check the belt deflection when the engine is cold, or has
been stopped for at least 30 minutes. A drive belt is considered new if it
has been used on a running engine for less than five minutes.
Apply 98 N (22 lb) of pressure to the drive belt at a point midway
between
the power steering pump pulley (3A733) and theater pump pulley (8509).
2. The drive belt deflection should measure 6.0-7.0mm (0.24-0.27 inch) for
a
new belt, 7.0-8.0mm (0.28-0.31 inch) for a used belt. The limit of
deflection is 9.0mm (0.35 inch).
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