Stripped stud hole, need how too.

[44bz]

I needed to replace a stud in the timing cover for my water pump. I installed the water pump and put a but on the new stud. It tightened down but I couldn't get it it torque. What's weird is the stud wasn't turning, the nut just spun and eventually it pulls the stud out. Should it try running a tap through the hole or does this sound like a helicoil fix? I'm so frustrated...


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[SJTD]

Helicoil or maybe larger stud. Tap won't help UNLESS you can go deeper and use a longer stud? Might be some hole left that wasn't threaded. A bottoming tap might help.

[44bz]

The hole for the stud is only about 1/4" deep and I'm not sure if there's even enough material there for a helicoil. I know the stud went through all the threads because it came out the back side. Like I mentioned, the mounting surface on the timing cover is only about 1/4" thick.


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[68glad]

Not sure what the 327 timing cover looks like. If the stud went all the way through is there room to put a nut on the back side?

[racerx12003r1]

Hey guys, to be honest, there are several ways to make thread repairs. Lock tite used to make a type of stuff like epoxy with a releasing agent. I have never tried it though so I cant say how it works. I have on the other hand used Helicoils. If it were me, that would be the way I would go. A nickles worth of free advice though, make triple sure you tap it straight. I have got them off just a little and it becomes a major pain. They are a great fix though,

[44bz]

Not sure what the 327 timing cover looks like. If the stud went all the way through is there room to put a nut on the back side?

I don't have a good pic but can get one later. There are four studs in the cover that hold the pump and they all fit in holes that go into the water passage. I thought about using a bolt and but instead but once the pump is on there is no way to hold the nut. The stud will still thread in it just won't tighten so I wonder if a slightly larger stud will work.


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[tgreese]

What size is the bolt? 1/4"?

I have found that these screw extractors work really well: http://www.aldn.com/Pages/grabitPro.php

Sears used to sell these as a set, but no longer. I have mostly used these to remove damaged p-head screws, but they will work on larger screws.

With a bolt in an engine, I would do everything I could to loosen the remaining screw shaft before the screw extractor. That includes penetrating oil, heat, whacking it with a pin punch. If the Alden extractor did not work, I would then use a left-handed drill bit to drill out the stud to the original clearance size, not oversize. Usually a left-handed bit will screw out the remaining bolt shank once you get a ways into the shank.

[44bz]

The stud is 5/16". I'm actually using a spare timing cover which only had three studs in it and I can't remember now what happened to the fourth one. So I bought a stud and installed but it wouldn't torque. I think there may be two problems with the stud I bought: 1) it might be slightly too small as it will thread in but won't tighten, and 2) the step in the middle where the threads change is very short and I wonder if it isn't significant enough to wedge against the cover.

Just tossing around ideas...


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[SJTD]

Sounds like if you can get a nut on the back, some Loctite on the stud and that nut and anti-sieze on the nut you'd normally remove should fix you up.

[44bz]

[qu ote="SJTD"]Sounds like if you can get a nut on the back, some Loctite on the stud and that nut and anti-sieze on the nut you'd normally remove should fix you up.[/quote]

I'll give this a try, thanks.


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[Herk]

JB Weld

[44bz]

JB Weld

Would you apply this to the threads on the stud?


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[Herk]

Yup, get everything clean and epoxy set it. Let the epoxy cure overnight before torquing the nut.

[44bz]

I picked some and will give it a shot. I like this idea better than a nut on the inside just in case it backed off for some reason and ended up circulating through my cooling system. Finger crossed!


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[Herk]

If you have room for a nut on the inside, you probably have room to run a bolt from inside out. Glue that sucker in and be done!