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Camshaft Thrust Plate, 1972 Cub

Tue Jan 29, 2013 6:40 pm

I am rebuilding my 1972 Cub that I inherited from my father-in-law and am currently on the engine re-assembly. I have gotten to the camshaft and on page 1-45 of the Service Manual it says to "Check the end clearance between the camshaft front journal and the thrust plate" and it should be between .003 & .012. Mine is coming in at about .020 to .024 so I would really like to replace the Thrust Plate, but Case IH doesn't make the plate any more and the only source I can find for one is Used.
I'm very reluctant to put a used Part in a wear location.
Does anyone have any suggestions, ideas, or maybe can tell me how critical this tolerance is?

thank you,

The Riot

Re: Camshaft Thrust Plate, 1972 Cub

Tue Jan 29, 2013 7:41 pm

Google part number 251257R1 and you will find some NOS parts listings. Good luck and welcome to the forum

Re: Camshaft Thrust Plate, 1972 Cub

Tue Jan 29, 2013 8:00 pm

Thank you, Bob. I thought I had covered all of the bases. The google search came up with a few possibilities.

Also, I appreciate the welcome. I'm having fund trying to bring this nice Cub back to life.

The Riot

Re: Camshaft Thrust Plate, 1972 Cub

Tue Jan 29, 2013 8:01 pm

That would be "fun" but that's an interesting slip.......................

Re: Camshaft Thrust Plate, 1972 Cub

Tue Jan 29, 2013 8:22 pm

:lol: Yup, as I learned from my Aunt at a young age, "if you want to play, you've got to pay" :lol:

Re: Camshaft Thrust Plate, 1972 Cub

Tue Jan 29, 2013 8:39 pm

http://www.rockanddirt.com/parts-for-sa ... =194869502

Re: Camshaft Thrust Plate, 1972 Cub

Wed Jan 30, 2013 3:10 pm

Thanks to all for the help!
Well I've run these traps and it seems that none of these sources have any New or NOS parts. All anybody has is used. So now I'm in a quandary, do I go back with my own used Thrust Plate (can't really see any wear but out of tolerance), or try and take a chance on some other used plates.
I guess I could have a machine shop build a new one for me, but that gets into a whole other set of variables.

Any thoughts, or any clue on how important this tolerance is?

Thanks again,

The Riot

Re: Camshaft Thrust Plate, 1972 Cub

Thu Jan 31, 2013 9:04 am

Been thinking on this one. Is the gear fully seated on the cam shaft shoulder?
Any thoughts, or any clue on how important this tolerance is?
Good question. The excess clearance wouldn't be a problem effecting the valve tappet action. Problem may be that the oil pump is attached to the back of and driven by the camshaft.

Brass stock in desire thickness. Use thrust plate as template. That's just a thought as I have not encountered this problem.

Re: Camshaft Thrust Plate, 1972 Cub

Thu Jan 31, 2013 9:49 am

Since IH saw fit to publish specifications for the clearance, one cannot assume that it is of no importance. But most engine machine shops who offer rebuilds probably do not even read the specs enough to consider this one. And a search for the part leads one to believe that several of the search engine hits lead back to just one original listing.
So I have no answers.

http://www.batescorp.com/

At one time, they had some inventory of new parts. Prices at the upper end of the spectrum.

Re: Camshaft Thrust Plate, 1972 Cub

Thu Jan 31, 2013 10:31 am

I'm not sure but could you turn the thrust plate around? It looks like you could.
Page-04[1].jpg

Re: Camshaft Thrust Plate, 1972 Cub

Thu Jan 31, 2013 11:19 am

Great idea, Smokey. I was kinda thinking the same thing. I will be out for a couple of weeks before I can get back to the rebuild project, but as soon as I can give it a try I'll post the results for everyone.

Thanks a bunch !!!!!!

The Riot

Re: Camshaft Thrust Plate, 1972 Cub

Thu Jan 31, 2013 12:08 pm

Confession time: I never paid any attention to this plate and the clearance. But it may be that a round thrust washer of the same diameter as the cam journal that adjoins the thrust plate would be the best solution- installed on the camshaft and then the thrust plate installed. The ID of the washer needs to fit the camshaft snugly so that the washer runs true when turning.

Re: Camshaft Thrust Plate, 1972 Cub

Thu Jan 31, 2013 1:06 pm

I have to confess when this thread started I didn't even know what a camshaft thrust plate was. :roll: My contribution to the Cub Tug trophy was a used Cub throw out bearing. I removed the grease zerk and bolted it to what I now know as a camshaft thrust plate. Learn something new every day from this forum. :{_}:

Re: Camshaft Thrust Plate, 1972 Cub

Thu Jan 31, 2013 3:37 pm

http://www.batescorp.com/cart/index.php ... t_id=31488

Blow up the photo of the used thrust plate. Appears to be well worn and reversible.

Re: Camshaft Thrust Plate, 1972 Cub

Thu Jan 31, 2013 4:36 pm

Thanks, Eugene. Yea, most of the used ones that have pictures of show considerable wear. Honestly, mine doesn't appear to have as much wear as most of the used ones I'm finding for sale.
I'm going to take a close look at reversing mine and I'm also seriously considering having a machine shop build me a new one to tolerance. I think that is fairly important to fit to recommended tolerance otherwise the camshaft could have a tendency to move back & forth and wear the journals and the bearings.

I think this should be called a "wear" plate instead of a thrust plate. The 1st journal of the Camshaft definately rubs against it and it obviously wears.

Take care,

The Riot
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