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Old 11-13-2019, 05:10 PM   #1
Flynman
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Default Snapped Bolt..

I snapped off a valve cover stud on my Aluminum PRC cylinder heads. These studs thread into the valve cover retaining threads and then the valve cover screws into the threads on these studs. It said to torque the studs to 45 inch pounds. I set the wrench to 25 inch pounds as a 1st pass and it snapped one off. The others went in fine. I was able to drill it out but I couldn't get a full thread cut depth on it. I can screw the stud in but its kind of loose. Is there any type of EPOXY that would work for this? ie; withstand heat and vibration? The bolts are only torqued to 45 inch pounds and then valve cover bolts get screwed into the studs.

Thanks,
Keith R
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Last edited by Flynman; 11-13-2019 at 05:24 PM..
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Old 11-13-2019, 06:23 PM   #2
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25 in/lb is only 2 ft/lb, noway you snapped that with a 1/4'' drive torque wrench. Wow! What torque wench did you use a 3/8'' drive one? If so you put 25 ft/lbs on it. Most all in/lb torque wrenches are 1/4'' drive.

You need to heli coil it. Drill out and install heli coil and tighten don't over torque. Google heli coil install and read also plenty of info on youtube I am sure on them. No way I would expoy that nothing will hold up like that.
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Old 11-13-2019, 06:45 PM   #3
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BO185 it was 1/4 torque wrench with only NM/In. lbs I have used it many times and it seems to be accurate so I am pretty puzzled by it all. Yeah I was thinking heli coil but was hoping for something a little easier. Long day today.. I will get up tomorrow and start again!!
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Old 11-13-2019, 06:56 PM   #4
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Quote:
Originally Posted by Flynman View Post
BO185 it was 1/4 torque wrench with only NM/In. lbs I have used it many times and it seems to be accurate so I am pretty puzzled by it all. Yeah I was thinking heli coil but was hoping for something a little easier. Long day today.. I will get up tomorrow and start again!!
Wow, yeah that's weird. I would get it calibrated to check it if you live in a decent size city usually place that will cal them for you for a small fee. It may be damage. If its ever been dropped the its pretty much out of cal.

On stuff like that in/lb and its just holding a stud I will use good ole hand torque wrench.

Heli coils aren't bad just take time and keep every thing clean.
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Old 11-13-2019, 08:34 PM   #5
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BO185 you got me thinking about the wrench so I go out in my shop and set it to 25, 30, 40, 50 inch pounds and test it on a bolt. and guess what?? It failed to click at all two out of 5 times. I used pretty regularly on this build and never had and issue (as far as I know) time for a new wrench....


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Keith R
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Old 11-13-2019, 08:47 PM   #6
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What brand is it? Most name brands can be fixed in cal.
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Old 11-13-2019, 08:57 PM   #7
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BO185 it's a Tekton. I have had it for about 2 years and seemed to work well. Maybe dropped on the bench to hard or something. Maybe i'll get a better one.
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Old 11-13-2019, 09:55 PM   #8
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Ahh yeah most those cheap torque wrenches won’t even cal. I know the company that did our cal on torque wrenches fail most of them. For 1/4” drive really need a nice one for accuracy. MAC or Snapon but they are $$$! The 3/8 and 1/2” ones usually craftsmans ones will hold cal.
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-73 IH 1210 Travelette SV392, 5sp, 4x4, 4.10's
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Old 11-13-2019, 10:23 PM   #9
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I had a Craftsman heavy duty click type torque wrench (actually 2) that did that immediately when new. Wouldn't click even on a low setting. I gave up on it after the second one and bought a Snap On. That was 40 years ago. The junk Craftsman wrench has a long handle and works nicely as a ratchet for turning the engine over when adjusting the valves etc.

A simple beam type torque wrench is far more forgiving as far as damage and keeping its calibration. I keep my first beam type 1/2" drive torque wrench that I got over 50 years ago as a gut check on the calibration of my bigger click type torque wrenches. I use only beam type for the smaller stuff. If a beam type torque wrench reads zero with no load on it, its calibration hasn't changed.

An anecdotal story here. I got a tooth implant a few years ago. That's where they put a piece of titanium all thread in your jaw or skull and attach a dental crown to it with a titanium nut. The dentist had a tiny titanium torque wrench to tighten the nut. I'm sure it cost him plenty, and I made a big payment to help him pay for it. It was a beam type torque wrench.
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Old 11-13-2019, 10:29 PM   #10
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One problem you may have with putting a helicoil in a blind hole is that the tap may not tap deep enough. You may have to tap until the point bottoms, then grind the tap shorter to make it a "blind tap". In fact you may have to do this twice, the first time shortening it leaving a bit of the taper, and the second time removing all of the taper.
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