Starter Motor rebuild Ball bearing size?

General Discussion
1

Hi All

I have been rebuilding my Starter Motor following Joe’s excellent video, the problem is even with the tips in the video the starter motor fell out of the vice and exploded on the floor, I have found all the scattered internal parts except the ball bearing the that Joe said “Be careful not to loose this”

This is the ball bearing that goes on the end of armature when it is mounted into the body.

I’m sure I would be able to source a replacement if I could find out the diameter of said ball bearing.

So if anyone is rebuilding their Starter motor and would be prepared to measure the diameter of the ball bearing and let me know that would be really helpful

Thanks in advance of any help

2

Hi All

To solve my issue, I have purchased two used starter motors and although neither actually fit my car, the internal parts of the Starter motors appear to be identical.

So my initial enquiry is now solved, and in case anybody is interested the Ball bearing is Either 6.35mm diameter or 6.89mm diameter, these were the sizes of the Ball bearings in the two used units I purchased.

I really wish I had paid more attention to the length of the “Nose” on the two units I purchased before I rebuilt them, as a lot of work went into the refurb only to find they were not suitable for my car.

However I have now completed the refurb of the original unit that was fitted to the car and thanks to Joe’s Video guide that item is tested and working and is ready to go back on the car.

My car is a 1997 5 speed manual NA which appears to take the Longer Nosed Starter Motor and the stamp on the aluminium body is M1T7 9081 which I understand is the correct item.

The two units I purchased which appear to be for some but not all Automatic GTO’s are stamped as follows M1T7 3281 and M1T7 3283.

Probably useless information, but if it helps anyone then all to the good.

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Thanks for posting the update. The information on the M1T7 9081, 3281, and 3283 starters is actually pretty useful, especially the difference in nose length. Glad you got the original one rebuilt and tested successfully. I’m sure this will help someone else down the road.

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