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eireann311
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PostPosted: Sat Jul 12, 2025 3:57 pm    Post subject: Main Bearing Reply with quote

Anyone have any idea how this happens?

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Glenn Premium Member
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PostPosted: Sat Jul 12, 2025 4:04 pm    Post subject: Re: Main Bearing Reply with quote

No endplay.
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PostPosted: Sat Jul 12, 2025 4:06 pm    Post subject: Re: Main Bearing Reply with quote

Super loose end play, and no crush left on the bearing? It might have been moving in the case every time you pushed in the clutch, and it finally broke the flange?

Brian
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modok
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PostPosted: Sat Jul 12, 2025 4:41 pm    Post subject: Re: Main Bearing Reply with quote

Crowbar in a sandbox?

If that's supposed to be the main thrust side of the bearing.....why are the 4 oiling reliefs missing?

oh, well maybe that's why

or

standard width bearing in a case already thrust cut?

Or, it didn't fit the case right, thrust faces look larger than normal, I vaguely recall some kind bearings like that, oz made? or repco?

Anyway, it would have worked if i'd put it in, but such details can be easily overlooked.
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mikedjames
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PostPosted: Sun Jul 13, 2025 1:03 am    Post subject: Re: Main Bearing Reply with quote

Heat.
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PostPosted: Sun Jul 13, 2025 6:55 am    Post subject: Re: Main Bearing Reply with quote

modok wrote:

If that's supposed to be the main thrust side of the bearing.....why are the 4 oiling reliefs missing.


That’s what I thought.
The alignment dowel hole shows that should be the flywheel side, but the oil slots are gone, and the ID chamfer looks big enough to be on the crank side.

Maybe the case wasn’t machined large enough of the extra OD on the flange, and then hammered it in to place, and split the bearing?

Brian
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PostPosted: Sun Jul 13, 2025 7:14 am    Post subject: Re: Main Bearing Reply with quote

Whatever the case, it's No Bueno.
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eireann311
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PostPosted: Sun Jul 13, 2025 8:36 am    Post subject: Re: Main Bearing Reply with quote

Standard case and thrust on the bearing, my guess is I managed to get the end play incorrect which lead to over heating and the end result? Perhaps?
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PostPosted: Sun Jul 13, 2025 9:36 am    Post subject: Re: Main Bearing Reply with quote

eireann311 wrote:
Standard case and thrust on the bearing, my guess is I managed to get the end play incorrect which lead to over heating and the end result? Perhaps?


The bearing’s bearing surface does look a little bit cooked! I bet it expanded and the weakest point gave up the ghost!

What are the punch marks in the bearing surface? Maybe it is the picture or?
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modok
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PostPosted: Sun Jul 13, 2025 2:35 pm    Post subject: Re: Main Bearing Reply with quote

eireann311 wrote:
Standard case and thrust on the bearing, my guess is I managed to get the end play incorrect which lead to over heating and the end result? Perhaps?

What?
I posted everything you need to know and you understood none of it. Laughing
Read harder

Use a NORMAL bearing, or learn what it's supposed to look like so you can make your wrong bearing right.
Where did you get this goofy bearing? Does it have a name?

If you want to know HOW MANY oiling reliefs a thrust bearing should have, it would be at least three, but maybe as many as six, nobody really knows, but zero is the wrong answer for sure. Berg built engines ofen have oiling reliefs on the other side of the bearing too, and..... that's not a bad idea.
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