I drove about 400 miles before realising that one of the alternator belts was broken. I'm going to change all the belts now, but could any damage hae been done to the alternator or car at all?

Replace those belts in pairs... they should come together as a matched set.

-Ryan
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Athens, Ohio -- 1990 245, 128k, M47, E-codes -- 1991 745, 278k (girlfriend-mobile)

Thats exactly why we have 2. If one breaks the brick keeps a runnin. One of the many brilliant ideas by the volvo engineers.

hi there.
shouldnt be any problems and its great to have two belts there isnt it?
good luck
mike
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25 by 25 sways, HD bils, B&G springs, strut & firewall braces, turbo cam & gear, exaust mods,14psi boost, E-codes, and more

I'm with the others; I think you should be fine.

Alternator alignment often goes crooked.
If the existing belt goes across the pulleys at an angle, then the alt. is crooked. Maybe that's why one broke?

Alternator is mounted on two rubber bushings.
When they get worn, alternator does not stay parallel to engine axis.
Now is the time to replace the bushings unless they are very young.
They are on the main mount bolt, at bottom of alternator.
The bushings cost about $1 each at fcpgroton; I'm sure other places have them too.
Replacing them later pretty much requires removal and replacement of the alternator; a relative PITA considering it's just two bushings.

The alternator belt tension adjustment bracket is also mounted on one of those bushings but I've heard of those breaking when you try to get at the bushing. So be cautious if you want to replace that one too. All three bushings are the same part #.
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DAMHIK: Don't Ask Me How I Know - - - Sven: '89 245, IPD sways, electric rad. fan conversion, e-codes, 28+ mpg - auto tranny. 500 mi/week commute. '89 245 #2 (wifemobile). '90 244 (spare, runs).