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Ford 9N, 2N & 8N Discussion Forum

Rod and Main Bearings

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Author  [Modern View]

07-11-2018 15:42:22

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Restoration of a 52 8N. Finally got the rod bearings after a vendor screwup. Main bearings have been in place, but I have a question. Before installing these bearings, I saw couple of UTube videos, where they did not mention about removing the plastigage after the test. I did not realize that it had to be done until I saw a later video where the mechanic removed the plastigage.
I wonder how important is to remove it. I had assumed that the plastigage would just liquify. Since I am still working on the bottom, should I try to remove the main bearings and clean the journals, or that would not be necessary?

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R Geiger

07-14-2018 20:04:24

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 Re: Rod and Main Bearings in reply to NCMau, 07-11-2018 15:42:22  
Quoting Removed, click Modern View to see

Since you have to remove a bearing cap to see what you, I sure don't know why one would not clean it off, and besides like Royse says clean them off and lube them with assy lube of some sort.If the main do not ahve assy fluid or oil on them I sure would remove the caps and clean and lube them.

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07-14-2018 19:41:49

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 Re: Rod and Main Bearings in reply to NCMau, 07-11-2018 15:42:22  
I always remove it, but that's because once I've measured the gap

I clean all the bearings and coat them with assembly lube so they
are pre-lubed during hand cranking, oil pressure building and then

on initial startup. I'm not a professional mechanic by any means,
that's just what I was taught. So far it has worked out well for me.

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07-12-2018 04:19:46

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 Re: Rod and Main Bearings in reply to NCMau, 07-11-2018 15:42:22  
Good clarification. I guess i will leave the mains in place, but I will clean the rod bearings when I get to that point.

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07-11-2018 16:19:24

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 Re: Rod and Main Bearings in reply to NCMau, 07-11-2018 15:42:22  
Plastigage is used to measure the clearance. Ideally it should be removed. However, it will dissolve on its own. Refer to the last paragraph in this link:


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