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Old 05-04-2015, 06:57 PM   #1
Pete_89T2
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Default Pilot bearing install depth

I can't seem to find any specs in the '89 FSM that tells you how deep into the E-shaft that the pilot bearing is supposed to be installed. Does anyone know?

I just had to yank my transmission because the pilot bearing failed; since it came out in pieces (inner race & needle bearings at least), I can't really be sure it was installed correctly to begin with.

I suppose I can buy the special tool Mazda has that makes installing the pilot bearing an idiot-proof, no measurement affair, but I'd much rather just slowly tap it in using a suitable sized socket or bearing driver I already have, and take measurements until it's in far enough.






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Old 05-04-2015, 07:14 PM   #2
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It should "just slide right in with some lube." That being said it will sit about the same depth as seal and bearing itself. Give or take a scosh.
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Old 05-04-2015, 07:37 PM   #3
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You feel in there you can kinda feel where the G spot is...

Kinda has its own land. Give it a tickle around in there with your pinky!
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Old 05-04-2015, 07:49 PM   #4
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There's no official spec on this from Mazda...

My rule of thumb is to use the width of the pilot bearing *seal* as the amount of space you want to see from the end of (the chamfer) of the hole in the back end of the eccentric shaft to the seal itself.
Of course, the pilot bearing itself is under the seal.

I have heard of people banging the pilot bearing all the way down until it stops, and this has worked for them...


-Ted
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Old 05-04-2015, 07:52 PM   #5
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Banging lets not get all crazy here.


I think you could use the clutch alignment tool to mebbe?


Edit: Ehhh might be a little short...


"Thats what she said" Stupid office...
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Last edited by chibikougan; 05-04-2015 at 07:56 PM..
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Old 05-04-2015, 08:08 PM   #6
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Quote:
Originally Posted by RETed View Post
My rule of thumb is to use the width of the pilot bearing *seal* as the amount of space you want to see from the end of (the chamfer) of the hole in the back end of the eccentric shaft to the seal itself.
Of course, the pilot bearing itself is under the seal.
This is about where the old one was installed; just in deep enough so that with the seal against the bearing, the seal sat flush with the chamfered edge of the hole. Thanks!
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Old 05-05-2015, 05:33 AM   #7
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If you use the Mazda SST to install them, it ends up right where Ted describes.
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