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Tractor Pulling Discussion Forum

cylinder head stud question

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Mike Aylward

07-19-2006 15:45:17




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I am going to install new cylinder head studs on my John Deere 70. I will have to have them made. What kind of steel would work the best? I am somewhat leary of getting them too hard but want a better than stock steel for them. Mike




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Mr. Tinker

07-21-2006 11:14:49




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 Re: cylinder head stud question in reply to Mike Aylward, 07-19-2006 15:45:17  
Mike,
DO NOT use round bar stock with cut threads on a lathe. They will fail at the threads. It will not help much even if they are made from preheat treated 4140 steel. Proper studs have an "interference fit" ROLLED THREAD on the block end and "standard" ROLLED THREAD on the head end..... then they are heat treated. DO NOT 'clean out' threaded holes in the block with a 'standard' tap as these tapped holes are of the 'interfearence' type.
1. Purchase new from Deere
2. Use your old ones
3. Purchase new from McMaster-Carr or Fasenal (sp)
4. Purchase good used ones

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dboll

07-21-2006 10:29:18




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 Re: cylinder head stud question in reply to Mike Aylward, 07-19-2006 15:45:17  
alot of work to make them as good ones can be bought, some guys have gotten studs through Cat if the parts man wants to look them up by dimension, ARP or somebody also have good ones, I have seen the ones with wrench flats on them, many are too soft, they stretch and head gaskets fail.I will ask friends of mine where they get them as they have some of the meanest G's around!



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JDGnut

07-20-2006 19:34:26




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 Re: cylinder head stud question in reply to Mike Aylward, 07-19-2006 15:45:17  
I had a set made for my G.. they are sitting in a box.. they didn't fit the block the way I wanted.. they were very loose in the block, until they bottomed out.. (it was like the pitch of the threads was different.. fatter on the orginal studs.) then the shank was smaller than the orginal studs.. I was a little worried about alignment of the head and block... Some time I was to install a dowl pin between the head and block to keep them from moving...

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Earl-IL

07-19-2006 19:21:28




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 Re: cylinder head stud question in reply to Mike Aylward, 07-19-2006 15:45:17  
Mike ,Those OE. studs thread that goes in the block are a rolled thread. I have cut them (fat) in a lathe but they were not perfect. They have to fit tight in the block or they will want to pull the threads in the block.Earl



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Lynard

07-19-2006 17:58:21




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 Re: cylinder head stud question in reply to Mike Aylward, 07-19-2006 15:45:17  
Mike On some of our JD pulling tractors we took grade 8 bolts and cut the heads off and had them turned to the right length. Seemed to work out ok. Lynn



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The Dukester

07-19-2006 17:19:04




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 Re: cylinder head stud question in reply to Mike Aylward, 07-19-2006 15:45:17  
I would try to get 4140 rod stock...it's what we used to buy to use for draw rods on 3000/10,000 psi hyd. booster cylinders we fabricated for isostatic pressing processes. It's very strong and tough yet machineable.



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