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I bought an M5R2 rebuild kit from Allstate gear, and after pressing on the input shaft bearing I noticed that the corresponding race has some chatter marks on the bearing surface, deep enough to feel with a fingernail.
Guessing this is a no-go, but I wanted to get confirmation before calling customer service - haven't had any positive interactions with them yet.
Thanks y'all.
If they're low spots it's probably fine. But that's not really acceptable quality for a new part so customer service will probably send you a freebie so you may as well call.
Boxcar bearing
That is unusual for a new bearing to be boxcar'd like that
It must have been on the bottom of a stack of a thousand bearings when it was shipped
Just got the replacement bearing in the mail, the new race has chatter mark just like the other.
Luckily I had already ordered an input bearing from Transmission Parts Distributors before I knew customer service from Allstate was going to send a replacement, and the bearing from TPD is flawless.
Shame on me for going with the less expensive kit to begin with, makes me wonder what the quality of the other bearings I already pressed on is.
In my humble opinion being involved in powdered metal and static cast for many years those are not chatter marks. They are porosity in the blank used to make the part. Honestly I wouldn't worry about it. Those are very likely ground finishes, not turned and as such chatter marks are not possible.
In my humble opinion being involved in powdered metal and static cast for many years those are not chatter marks. They are porosity in the blank used to make the part. Honestly I wouldn't worry about it. Those are very likely ground finishes, not turned and as such chatter marks are not possible.
I called them chatter marks because I don't have the vocabulary/expertise to accurately describe the flaws, happy to be corrected there. When learning about bearings previously, I've only heard that a non-uniform surface is sub-optimal, and that pitting can expedite wear. Seems folks here feel that low spots are fine, but this is my first rebuild so I'm extra paranoid about potential mistakes. Feels like a lot of faith to put on a fingernail test and a thin layer of ATF, especially for the hardest-working bearing in the transmission.
If folks have recommendations for how they inspect their bearings & races before giving them the OK I'd much appreciate them.
I know the sample size is small, but it also seems like a red flag if I get two bearing races with the same imperfections from Company A and a perfect bearing on the first try from Company B.
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