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Allis Chalmers C valve cover stud bolts


 
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Larry Hardesty
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PostPosted: Fri Dec 04, 2015 6:00 am    Post subject: Allis Chalmers C valve cover stud bolts Reply to specific post Reply with quote

I am putting back together the engine for a 1942 Allis Chalmers C. It looks like the two studs that hold the valve cover on are different. One has coarse threads at both ends and the other has coarse threads at one end and fine threads at the other. Why is this so? Or did I mix up some studs somehow..don't think so, but for the life of me I cannot figure out AC made the studs different (and they have different part numbers in the parts book). Usually something like this is done for a purpose, and I do not want to mess something up. Thanks in advance
 
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PostPosted: Fri Dec 04, 2015 8:08 am    Post subject: Re: Allis Chalmers C valve cover stud bolts Reply to specific post Reply with quote

I would have to look to be sure but that maybe a case of some one messed up the treads a long time ago and then used a course die to fix the problem on one of those studs. I know I have at least 4 C heads around since I have to running Cs on the place plus a couple c parts tractor
 
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Larry Hardesty
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PostPosted: Fri Dec 04, 2015 10:25 am    Post subject: Re: Allis Chalmers C valve cover stud bolts Reply to specific post Reply with quote

Well, the coarse threads seem to screw into the head okay, and three of the four ends of the two bolts are coarse threads. But who knows that may have been done over the years. I think the head shows evidence of being overhauled two or three times previously. Thanks Larry
 
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midwesternhayfarmer
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PostPosted: Fri Dec 04, 2015 10:44 am    Post subject: Re: Allis Chalmers C valve cover stud bolts Reply to specific post Reply with quote

On the B one stud is different to act as anoil channel for the rockers.
 
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Dick L
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PostPosted: Fri Dec 04, 2015 6:25 pm    Post subject: Re: Allis Chalmers C valve cover stud bolts Reply to specific post Reply with quote

All should have course threads on the end that screws into the head. All should have fine threads on top. One will have the groove for oil to get up to the rocker arm shaft. You might have a manifold stud mixed up. Also might be someone else mixed it in before you.
 
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Larry Hardesty
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PostPosted: Fri Dec 04, 2015 7:49 pm    Post subject: Re: Allis Chalmers C valve cover stud bolts Reply to specific post Reply with quote

I think these are too long to be manifold studs. They are probably 5 inches long. Ummm...and I not seeing grove in them for oil.

Thanks

Larry
 
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PostPosted: Fri Dec 04, 2015 8:50 pm    Post subject: Re: Allis Chalmers C valve cover stud bolts Reply to specific post Reply with quote

One should have the oil groove or you will have a problem down the road
 
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Dick L
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PostPosted: Sat Dec 05, 2015 7:04 am    Post subject: Re: Allis Chalmers C valve cover stud bolts Reply to specific post Reply with quote

The head will have an oil line going to it from the oil pump. The hole the fitting screws into that is attached to this oil line is drilled to the center of the head under the hole where the stud with the groove screws into. That is how oil gets to the top of the head. Without that stud you have a dry, un-oiled, rocker arm/valve assembly. Easy detail to follow while understanding how your engine gets its lubrication.
 
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Larry Hardesty
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PostPosted: Sat Dec 05, 2015 8:16 am    Post subject: Re: Allis Chalmers C valve cover stud bolts Reply to specific post Reply with quote

Thanks to old and Dick L. Looks like I need to find the right stud somewhere.
 
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PostPosted: Sat Dec 05, 2015 8:30 am    Post subject: Re: Allis Chalmers C valve cover stud bolts Reply to specific post Reply with quote

I have one or 2 heads laying around and I am sure that both would have that stud on them. My e-mail is always open
 
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Larry Hardesty
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PostPosted: Sun Dec 06, 2015 6:50 am    Post subject: Re: Allis Chalmers C valve cover stud bolts Reply to specific post Reply with quote

Did you get my e-mails?
 
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Larry Hardesty
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PostPosted: Tue Dec 08, 2015 8:33 am    Post subject: Re: Allis Chalmers C valve cover stud bolts Reply to specific post Reply with quote

Found one locally, Thanks

Larry
 
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