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Thanks Derek, good thread. If I understand it: there are 2 common belt widths for 240s - 9.5mm and 10mm; but a Volvo tech said that Volvo only used the 9.5s.
I'm going to drive the car some today to see if it continues to improve. Then I'll inspect/ clean the 3 pulleys again and perhaps swap to wider belts - I saw a set looking through my spares. A few observations:
1. I have several spare alternators. Visually, the alternator pulleys from the older (83-85) cars look like they are tighter ie. the pulleys are made of thicker metal and seem less deep.
2. When I installed the 3rd alternator (one from an early car), I had more trouble getting the belts over the pulley. That could mean that the housing is larger and won't move as close to the motor.
2a. Visually the belts don't seem as far down into the pulley; and
2b. The adjustment screw did not require as much tightening.
3. Folks say that there are standard sizes of alternator pulleys. Maybe there's a a US one that's close to metric (angle) and these get swapped around on the rebuild assembly line. So perhaps the 9.5mm belts only work well in a clean and correct pulley.
3a. There are BTW at least 2 water-pump pulleys - 2 different center hole sizes.
I'm going to infer from all this that I happen to have a mismatch of belts and pulleys. The water-pump and crank pulleys look good but I'll recheck.
I've had similar problems with other 240s (albeit not quite this bad) that were fixed by swapping belts and pulleys.
OTOH, my 240 driver a few years ago had been parked in a garage for ~ 5 years. I got it running and drove some to see what it needed. The belts were stuck to the pulleys but no squeal and driving cleaned the pulleys right u. I left them on the car for a while, no probs.
Aside: I saw in one of the messages on your forum "2 steres of wood". New word to me - a metric weight-volume measure used in the UK?
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240 drivers / parts cars - JH, Ohio
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