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Old 09-15-2009, 09:23 AM   #1 (permalink)
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press in rocker stud DIY ?

my 289 has snapped a press in rocker stud and i`m wondering if its possible to replace it myself.. i have the Tom Monroe book and this suggests utilising a brass malllet with nuts bolted on to protect the top of the stud.. i mentioned this to someone and they thought it was a bit dubious.

its snapped at the bottom of the thread so i also need to remove it.

cheers,

Mark
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Old 09-15-2009, 09:37 AM   #2 (permalink)
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Re: press in rocker stud DIY ?

What you need to do now is thread the part of the stud that is still there. Then you can slowly use a nut to pull it out with spacers. For the spacer that goes against the head, I use a power steering bearing spacer. That way the nut will rotate easier and only pull the stud out instead of rubbing against the spacers and making it tougher. A little heat on the head boss will make it easier to.
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Old 09-15-2009, 09:42 AM   #3 (permalink)
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Re: press in rocker stud DIY ?

i`m wondering will i be able to turn a die with the other rocker studs adjacent?

Quote:
Originally Posted by dacofa View Post
What you need to do now is thread the part of the stud that is still there. Then you can slowly use a nut to pull it out with spacers. For the spacer that goes against the head, I use a power steering bearing spacer. That way the nut will rotate easier and only pull the stud out instead of rubbing against the spacers and making it tougher. A little heat on the head boss will make it easier to.
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Old 09-15-2009, 05:13 PM   #4 (permalink)
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Re: press in rocker stud DIY ?

threading is very difficult,I couldnt do it on mine.What I did was tack weld a stud on top of the broken stud and use a nut with washers to pull it out.Do yourself a favor and put in screw-in studs.Good luck!
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Old 09-16-2009, 09:23 AM   #5 (permalink)
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Re: press in rocker stud DIY ?

Personally, if you're not very experienced in doing this. Save yourself the greif and pull both heads and take them to a machine shop that can pull the studs and install threaded ones. You have to be very careful when tapping the hole out to make sure it's straight. Otherwise you'll change the rocker arm angle. That = more problems down the line. Trying to save a little money now can cost a lot later. Plus you won't have to worry about it being right.
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Old 09-16-2009, 08:20 PM   #6 (permalink)
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Re: press in rocker stud DIY ?

Quote:
Originally Posted by dacofa View Post
Personally, if you're not very experienced in doing this. Save yourself the greif and pull both heads and take them to a machine shop that can pull the studs and install threaded ones. You have to be very careful when tapping the hole out to make sure it's straight. Otherwise you'll change the rocker arm angle. That = more problems down the line. Trying to save a little money now can cost a lot later. Plus you won't have to worry about it being right.
This is very good advice...You can ruin a good set of heads by tapping the stud holes crooked..
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Old 09-17-2009, 07:03 AM   #7 (permalink)
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Re: press in rocker stud DIY ?

I did not read anything here as to just why the original one(s) broke off where they did instead of bending over.

Wm.
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Old 09-17-2009, 05:32 PM   #8 (permalink)
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Re: press in rocker stud DIY ?

The studs work-harden over the years and break at the weakest point that works the most - usually at the last thread.

I agree - pull both and have screw-in studs installed.
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Old 09-19-2009, 08:26 AM   #9 (permalink)
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Re: press in rocker stud DIY ?

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Originally Posted by PaulS1950 View Post
The studs work-harden over the years and break at the weakest point that works the most - usually at the last thread.

I agree - pull both and have screw-in studs installed.
Very true, I had one break off and took it to one shop and he worked on it for hours trying to drill it out. Broke a couple of very expensive bits. He finally got the one repaired but, refused to replace the others. I took it to a friend who had a special press he put together to pull studs. He did all of them and threaded the heads for studs. One shop refused to even try to do it. So there's no way I could have removed that broken stud myself.

These were Dooe heads that had had a very nice port job done to them. I still have them on a spare 306.
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