press in rocker studs? - Chevelle Tech
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  #1  
Old Jun 20th, 07, 3:09 AM
danoman31 danoman31 is offline
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Default press in rocker studs?

Hello,
I have a stock set of cylinder heads #041, that have a few messed up studs. Does anyone know of a cheap, easy, way to pull them and of course replace them. I've done a bit of bowl work and the valves are fairly new, so I'd like to keep them for awhile until I can afford a different set of heads. Thank you!
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  #2  
Old Jun 20th, 07, 5:32 AM
aukai aukai is offline
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Default Re: press in rocker studs?

If you are not going to reuse the studs put a washer at the base of the stud put a spacer that just fits and run the nut down with an impact the spacer will pull the stud out if not real tight also you may be able to find the proper tool and rent it.
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  #3  
Old Jun 20th, 07, 11:59 AM
engineguy engineguy is offline
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Default Re: press in rocker studs?

Replacing press-in studs is a real pain. They can be removed with spacers and impact wrench like aukai said. But replacing them is the hard part. . . . .
You will need to ream the holes slightly oversize and use oversize studs, I think the are either .003" or .005" over. If you put standard size studs back in, they will eventually pull out.

The very best fix is to take the heads to a quality machine shop and have screw in studs installed. They will mill off part of the head to make room for the jam nut on the stud and tap the hole. These operations must be done on a vertical mill or similar machine, in order to get the holes tapped straight.

An alternative would be to pin the studs. To do this you drill horizontally through the head and stud and install a roll pin. Pinning works OK, as long as spring pressures are not much higher than stock - in my opinion.

Bottom line, if you have invested time and/or $$$ in the heads, then it is best to have the screw-in studs installed.
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  #4  
Old Jun 20th, 07, 12:11 PM
66 BRONZE 66 BRONZE is offline
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Eric
 
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Default Re: press in rocker studs?

If you take your heads to a machine shop for screw in studs have them take 020 off of them , you might be suprised..
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  #5  
Old Jun 20th, 07, 1:22 PM
BillK BillK is offline
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Default Re: press in rocker studs?

Dan,
If you only have a couple, Pioneer makes a screw in repair stud that does not have the hex shoulder on it. All you do is remove the old stud, thentap the hole to 7/16 x 14. No need to mill anything, just screw the repair stud in and you are good to go. The existing hole is the correct size for the tap, so as long as you are somewhat carefull keeping the tap straight, it is a pretty easy job. The Pioneer number for the stud is RM348. Your machine shop should be able to get them for you if they dont already have some.
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  #6  
Old Jun 21st, 07, 1:19 AM
danoman31 danoman31 is offline
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Default Re: press in rocker studs?

Thanks guy's!
I'm on limited budget so I needed to find a way to do this myself. Years ago I was in a Votech school and had to learn how to completely rebuild heads as part of the training, but 25 years later the memory has fogged up a bit, and the lack of the proper tools doesn't help either. I think I'll try the BillK method first, then if that doesn't work I guess it's off to the machine shop. I'd rather save the $$ for a newer/better set of heads to install screw in studs and guide plates. Thanks again for all that answered!!!
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  #7  
Old Sep 3rd, 07, 10:52 PM
curley8788 curley8788 is offline
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Default Re: press in rocker studs?

i need to reup this topic for a second. one of my press-in studs' threads got chewed up from a loose rocker arm. im going to pull it out and use that part # RM348. does that new stud have the nut at the bottom? if so its going to be too tall isnt it? i measured the length of my busted stud and from the hole to the tip it's 1 5/8 inch.
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  #8  
Old Sep 3rd, 07, 11:10 PM
kirkwoodken kirkwoodken is offline
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Default Re: press in rocker studs?

Like BillK says: Since I worked in a machine shop, I was able to grind a pilot on the 7/16X14 tap about 5/8" long that guided the tap into the hole straight. I strongly suggest that if you try threading them yourself, you buy a tap and find a local grinding shop to put a pilot on it. Just make the pilot about .374" and the threads will come out perfect. You will still need the studs that are used without the jam nuts.

For removing the studs with a nut and washers, you can use the rocker balls for spacers. If you should decide to ream the holes larger and pin the oversize studs, drill an 1/8" hole that only kisses about 1/16" of the stud, and use 1/8" roll pins. Don't drill the hole through the middle of the stud, as it only weakens the stud and the stud boss. Before you try drilling the studs, try putting a file mark in them to make sure they are soft enough to drill. I recommend that you make some form of drill fixture to get all the holes in the right place.
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