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TO 20 engine rebuild front main bearing

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Ed Womer

02-10-2019 07:50:24

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Hi everyone I posted this question else were and Steve suggested that I move my question here. I am putting back together my Continental Z 120 motor with all of the parts supplied with the complete rebuild kit since a distributor failure caused the gear on the cam to get strip and chewed up.

Went to put the crank back in and noticed the front main seal was a straight bearing and did not contain the integral flange that helps with the crank thrust. I did come back to the site and the description of the kit mentioned this. My problem is that the kit has a brass washer that appears to be exactly like the one that fits else where on the crank but already has the three holes for the locating pins that are there to center it and keep it from spinning.

There is no description of where to use this other brass ring and how to locate it so it is centered and will not spin. Dose anyone have any idea what to do with this change in the style of bearing and where to put this brass washer and how to locate it? I certainly don't know what to do since there is no direction as what to do with this other brass washer that came with the kit.

Thanks, Ed Womer

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02-12-2019 21:37:52

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 Re: TO 20 engine rebuild front main bearing in reply to Ed Womer, 02-10-2019 07:50:24  
There are 3 holes in the front of the block that round brass pins are inserted into to hold the thrust bearing in place . The end of the pins should be slightly below the front surface of the bearing. I don't remember the diameter of the pins, but I know I found brass round stock at a hobby shop that fit. No sealer or adhesive should be used.


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Ed Womer

02-12-2019 11:32:00

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 Re: TO 20 engine rebuild front main bearing in reply to Ed Womer, 02-10-2019 07:50:24  
Thanks for responding guys! I haven't figured out how to access the archives but did go back and start looking at the oldest posts and going to newest and noticed a post about recommending Monte Equipment. I did call them and the guy said that you have to pin the extra brass ring to the block and that the original bearings are no longer available.

I also did check the bearings on ebay and there does seem to be quite a few there with the cheapest being $155 and the guy has a very good rating.

So before I buy another set of bearings has anyone used the new bearings and drilled and pinned the brass ring onto to the block or the bearing cap? It would be easier to drill the bearing cap since it is easy to put it in the milling machine to do the drilling.

It does appear that the local engine shop that cleaned the block did give me the other brass bearing back but the pins are missing from the returned parts but I can make them up out of stock round. Is there any caulk or adhesive used to keep the brass rings attached to the block?

I am not an engine builder or re builder but do fabricating in the road racing of SCCA FV cars and having an experienced auto mechanic helping with assembling the engine.

Thanks everyone for the advice, Ed

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Tom h.

02-10-2019 16:28:53

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 Re: TO 20 engine rebuild front main bearing in reply to Ed Womer, 02-10-2019 07:50:24  
You need the flanged main bearing. Look at eBay Ferguson to20 main bearing, there is a seller with standard set very cheap.

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Duner Wi

02-10-2019 12:00:03

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 Re: TO 20 engine rebuild front main bearing in reply to Ed Womer, 02-10-2019 07:50:24  
Found this in the archives, There are more stuffs about this in the archives also with pictures.

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