Re: 9N main bearing studs

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Posted by TheOldHokie on September 30, 2020 at 17:11:23 [URL] [DELETE] :

In Reply to: Re: 9N main bearing studs posted by JimN on September 30, 2020 at 09:29:09:

Personally I think a good machinist owns a bore gage and knows how to use it to accurately measure bearing clearance. Plastigage is for ill equipped amateurs.

An engine builder can easily get within the .0025 clearance on a line bore. That would be the outer limit of what I was happy with.

If I understand your concern it is cap registration on reassembly after machining the caps.The L-head design does not have a cap registration recess in the block like a modern engine. Which begs the issue of what the engineers felt was needed.

I see no need for sourcing beat to death OEM studs to achieve that end. Any engine builder worth his salt should be able to make after market studs act as a register. If you believe it is important knurl the shoulder to get an interference fit on the caps. I think that is as good as it gets given the design.


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