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Old 02-16-2008, 08:28 PM
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292 Y block engine bearing issue

I am rebuilding my '57 292 and upon attempting to put the new bearings into the block I am hitting an issue.

The main cap bearings all go in fine except the one at the end of the block with the side walls. It just doesn't seem to fit? I tried to refit the old one and have the same issue with that one too?!

The attached photos should show the problem. The walls of the bearing almost seem to be a fraction too close to each other. A rubber mallet will allow me to get the bearing to start to go into place but I doubt that is the way to do this.

Can anyone shed some light on what might be a) the problem or b) the solution?

Thanks,
Paul
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Old 02-16-2008, 08:50 PM
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That is the thrust bearing, and they can be tough to install sometimes. (this must be one of those times) I have never had to use a hammer, mallet, or otherwise to install one. I just invert the main cap and push it down onto my work bench. As far as the block half of the bearing use a screwdriver with a plastic handle(plastic handle to the bearing) to tap it into the notched end first, then tap the other end in.
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Old 02-16-2008, 09:38 PM
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re:y-block bearing

What I have done in the past to get the bearing in is; I will take a piece of #1000 grit wet/dry paper,using very thin oil i.e. honing oil,wrap the paper tightly around a steel ruler,and put it on top of your bench,or another thinner,flat area.very gently,work the inside of the thrust surface,one side,then the other.stop frequently and check the fit,it should be snug,but not tight,and not so loose as to permit free movement.I forgot to add;wipe the surfaces completely to remove any grit.
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Old 02-17-2008, 04:58 AM
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Did you compare it to the old bearing? Maybe it is a 312 and/or mis-packaged?
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Old 02-17-2008, 09:59 AM
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All useful suggestions, thanks! I will have another try this morning.

KULTULZ, I did a visual comparison and they seem identical. Is the difference between the 292 and 312 bearing noticeable?

Paul
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Old 02-17-2008, 11:44 AM
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You have the thrust bearing in the wrong spot. It goes in #3 position, not #5.

tom
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Old 02-17-2008, 01:53 PM
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Tom

I spent an hour on the engine this PM and realized my error. I had hoped I would 'get away' with it without having to admit such a basic mistake! Thats what I get for trying to assemble an engine after a red eye flight back from California.

Anyway, the bearings are all in although when I bring the bolts up to the proper torque I am unable to turn the crank. Interestingly it is the thrust bearing that is causing the issue. Once I slacken the bolts off only on that one the crank turns fine.

I had tested clearances using plastigage so am a mystified.

I will retest clearances once more to see what is the problem.

Thanks for the input,
Paul
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Old 02-17-2008, 01:55 PM
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Quote:
Originally Posted by pcoghlan
Tom

I spent an hour on the engine this PM and realized my error. I had hoped I would 'get away' with it without having to admit such a basic mistake! Thats what I get for trying to assemble an engine after a red eye flight back from California.

Anyway, the bearings are all in although when I bring the bolts up to the proper torque I am unable to turn the crank. Interestingly it is the thrust bearing that is causing the issue. Once I slacken the bolts off only on that one the crank turns fine.

I had tested clearances using plastigage so am a mystified.

I will retest clearances once more to see what is the problem.

Thanks for the input,
Paul
Perhaps you tweaked the thrust bearing while trying to put it where it didn't want to be...........


tom
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Old 02-17-2008, 02:06 PM
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It could be you spread the thrust surface out a little while trying to install it (I won't mention where). Take a magic marker and mark the thrust sides of both halves and snug it up. That should show you where it locking up.
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Old 02-17-2008, 02:11 PM
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Is that why Fords #3 and Chevy's#5?
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Old 02-17-2008, 03:17 PM
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I may be completely off base here...But..it appears that you are attempting to put the thrust bearing in #5 main saddle...it should be at # 3. If that's the case, you will never get it installed. From the pic you posted of the bearing setting in the block, that sure looks like #5. That would be your problem.

EDIT: I see that I missed Tom's post..but he's right

Last edited by woodz428; 02-17-2008 at 04:00 PM.
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Old 02-17-2008, 11:21 PM
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Quote:
Originally Posted by woodz428

EDIT: I see that I missed Tom's post..but he's right
And I am blind...
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