Hello all, I just changed my alternator belt and now the alternator is not turning. The belt is turning but the "fins" (not correct term I know) on the front of the alternator isn't turning along with belt squealing and smoke from the alternator. The belt doesn't appear too tight. I had sprayed PB blaster on the bolts earlier. Possible this leaked into the unit causing problems? I had also been tapping on the alternator earlier to move it, Possible I damaged something inside keeping it from turning freely? Thanks,JEFF

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1981 240d aka "The rust bucket"

Looks like too much TLC. Can U remove belts and try by hand back and forth to break lose?

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1982 300SD

If you bent one of the fins on the front it could be hitting the housing. Otherwise nothing you describe suggests a bearing should be frozen. Look it over carefully for the culprit and in the future avoid using a hammer on your alternator!

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

To begin with were you changing the Belts to solve a specific problem?

People do not often think of it this way but a Hammer is actually a special tool.

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84 300D, 82 Volvo 244Gl Diesel

My vote is deffinitly on hammer/fin contact. take the belt off and straighten fins until it turns.

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1996 s10 zr2 with a 6.5 turbo diesel
1996 c2500 suburban with a 6.5 turbo diesel
1981 300sd with a turbo 617
Monte carlo figure 8 car

I had this issue once on a alternator change... I swapped in an unknown adjustment bracket, and it looked odd to me... the support for the adjustment bolt was bent out and it made contact with the fins of the alt. look at the adjustment bracket and verify nothing is contacting the cooling fins!
and yeah, if you hit the fins with a hammer,you could have easily bent one to where it hit the housing of the alt...
flashlight time!

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!