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My decision....
Posted by Eiron [Email] (more from Eiron) on Sat, 8 Sep 2007 13:43:42
In Reply to: Worth buying 2nd used alternator?, Eiron, Wed, 5 Sep 2007 16:22:20
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Thanks for all the opinions. In the end, I decided to install the new(er) alt & keep the original as a spare. Why? Well, I had everything out of the car anyway while I was tracking down my no-charge issue, & I looked a little more closely at the two alts. Here's what I observed:
1. The commutator rings on the new alt were worn about .010" while the rings on the original alt were worn about .030"-.040". I have no idea how deep those rings can wear before they're worn out, but less is obviously better. Since my alt has about 220k mi on it, I figger the new alt has less than 75k on it.
2. The old brushes of the VR on the new alt are worn down to about the same length as the new brushes I just installed into the original VR (for use in the original alt). Yes, new Bosch VRs have brushes that are about 2mm longer than new Bosch replacement brushes!
3. The bearing in the original alt has a slight amount of play in it while the bearing of the new alt has absolutely no play.
Both alts put out a solid 14v when tested at the parts store, but these three items (& the fact that I already had everything out of the car anyway) convinced me that my $90 would be put to better use by installing the newer alt instead of either holding on to it or getting my money back in my pocket.
posted by 71.212.220...
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