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> I recently installed a new Bosch generator, but it was giving me > squealing noises, so I removed the belt (new) and tighted up the by > removing all but 1 shim. It is tighter now and the squealing is gone. > Problem now is that I'm getting sparks inside the generator housing at > higher rpm. Is this normal?
You don't want to go overboard with the shims, because overtightening will just lead to rapid belt and bearing wear. You want it only as tight as it needs to be to not squeal. It can be a pain to find that point, but the good news is that once this is done you won't have to readjust it for years.
A certain amount of sparking is normal; a lot of sparking is not. This is hard to describe; it's kind of a judgment call. A freshly rebuilt generator should have a commutator which has been turned nicely round, and an out-of-round commutator is the biggest cause of sparking.
OTOH, Mike W. had a fresh Bosch rebuild where the commutator was grossly out-of-round.
One thing you can do is just see if the brushes are going up and down to follow the commutator. There should not be enough movement there to either see or feel.
Do I need a new pully?
The brushes are not going up and down, following the commutator.
Gary '71 FI AT Square
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