broken stud on 914-6 oil tank |
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broken stud on 914-6 oil tank |
dwelle |
Jan 12 2021, 04:23 PM
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#1
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Newbie Group: Members Posts: 13 Joined: 24-December 16 From: a town south of fresno Member No.: 20,693 Region Association: None |
i had to pull the oil tank out of my 914 to address a leak, and one of the mounting studs on the tank broke when i went to remove the nut. it broke about a 1/4" off of the tank.
quick google search last night didn't yield any good intel, what am i looking at to replace that stud?... |
johnhora |
Jan 12 2021, 04:57 PM
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#2
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Senior Member Group: Members Posts: 864 Joined: 7-January 03 From: Derby City KY Member No.: 107 Region Association: None |
you're talking about this in the drawing below...correct?
if so may need to weld another one on.... how much is left on the tank take a picture and we can see what to address I'm sure someone on here has done it on a 6 tank or on a 911 tank |
dwelle |
Jan 12 2021, 06:16 PM
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#3
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Newbie Group: Members Posts: 13 Joined: 24-December 16 From: a town south of fresno Member No.: 20,693 Region Association: None |
yes, the stud on the right hand side of that diagram is the one that broke. there is only 1/4" or so left on the tank.
i can feel the back of the other stud and it feels almost like it's pressed in from the back side... |
Root_Werks |
Jan 12 2021, 06:22 PM
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#4
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Village Idiot Group: Members Posts: 8,288 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest |
If there's enough thread, you might be able to use a stud extender. Might have to put an extra washer or two on the engine bay side. But it would be an easy fix if it's possible.
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PanelBilly |
Jan 12 2021, 06:32 PM
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#5
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914 Guru Group: Members Posts: 5,788 Joined: 23-July 06 From: Kent, Wa Member No.: 6,488 Region Association: Pacific Northwest |
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dwelle |
Jan 12 2021, 06:46 PM
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#6
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Newbie Group: Members Posts: 13 Joined: 24-December 16 From: a town south of fresno Member No.: 20,693 Region Association: None |
yeah, there isn't enough of the stud left, and the threads are jacked anyhow.
i'll likely have another welded on?... |
johnhora |
Jan 12 2021, 07:35 PM
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#7
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Senior Member Group: Members Posts: 864 Joined: 7-January 03 From: Derby City KY Member No.: 107 Region Association: None |
You could try to cut the old one flush at the base and then drill and tap the hole for a new stud. Being carful not to drill thru into the tank.
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Mark Henry |
Jan 13 2021, 08:41 AM
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#8
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Or carefully weld a new stud on. I've done this before but not on a tank.
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gereed75 |
Jan 13 2021, 10:21 AM
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#9
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Senior Member Group: Members Posts: 1,233 Joined: 19-March 13 From: Pittsburgh PA Member No.: 15,674 Region Association: North East States |
Maybe take a bolt with the same tread, grind the head to about .080" thick. Grind the broken stud flat to the tank. Mig the modified bolt/stud to the tank.
That is what I would try. The extra material provided by the ground head would make it easier, less risky to weld. You could push the puddle formed by the hot head metal to flow into the tank wall material for good penetration without burning through the tank wall. The threads would be clean all the way down the stud to the weld, where as when welding a stud to the broken stud you would have to chase the threads down onto the old stud to get a full threaded stud. Possible but a bit risky and a lot of work. be sure that if you try this to grind off the copper plating that is on the tank. Welding through the copper would ruin the weld. But that is just my opinion and I am a semi-skilled rank amateur. |
aturboman |
Jan 13 2021, 10:54 AM
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#10
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Member Group: Members Posts: 134 Joined: 18-October 11 From: CA Member No.: 13,687 Region Association: None |
I've fixed this problem before on 911 tanks. You'll need to carefully grind the broken stud flush to the the tank and clean the area to bare metal.
The only proper way to re-attached a stud to metal this thin is to carefully braze a new stud on and it will be as strong as the original The tank is too thin for electric welding in my opinion even TIG is a challenge due to the vast differences in material thickness. Also getting rid of all the oil or rust contamination for a proper electric weld is near impossible, brazing is much more tolerant in that regard. |
rgalla9146 |
Jan 13 2021, 01:01 PM
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#11
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Advanced Member Group: Members Posts: 4,538 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None |
I've fixed this problem before on 911 tanks. You'll need to carefully grind the broken stud flush to the the tank and clean the area to bare metal. The only proper way to re-attached a stud to metal this thin is to carefully braze a new stud on and it will be as strong as the original The tank is too thin for electric welding in my opinion even TIG is a challenge due to the vast differences in material thickness. Also getting rid of all the oil or rust contamination for a proper electric weld is near impossible, brazing is much more tolerant in that regard. (IMG:style_emoticons/default/agree.gif) This method done with either welding technique is the way to go. BUT.... evaluation of the attachment is area is imperative. A trusted, experienced welder can do this....or suggest other remedies. |
dwelle |
Jan 13 2021, 02:36 PM
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#12
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Newbie Group: Members Posts: 13 Joined: 24-December 16 From: a town south of fresno Member No.: 20,693 Region Association: None |
ok, thanks. i'm not going to attempt to weld this one myself. time to call in some friends with better skills than i...
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Cairo94507 |
Jan 13 2021, 02:46 PM
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#13
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Michael Group: Members Posts: 9,654 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California |
Personally, I would email @mb911 and explain what happened and send him a picture and see if he could repair it if you shipped it to him. I would want it repaired correctly with a new stud. (IMG:style_emoticons/default/beerchug.gif)
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mepstein |
Jan 13 2021, 02:50 PM
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#14
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914-6 GT in waiting Group: Members Posts: 19,142 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
(IMG:style_emoticons/default/agree.gif) someone with the right skills will repair it correctly.
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dwelle |
Jan 13 2021, 03:58 PM
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#15
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Newbie Group: Members Posts: 13 Joined: 24-December 16 From: a town south of fresno Member No.: 20,693 Region Association: None |
Personally, I would email @mb911 and explain what happened and send him a picture and see if he could repair it if you shipped it to him. I would want it repaired correctly with a new stud. (IMG:style_emoticons/default/beerchug.gif) good idea, thanks... |
mb911 |
Jan 13 2021, 05:49 PM
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#16
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914 Guru Group: Members Posts: 6,750 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
Thats a tricky spot for sure.. that stud is brazed with a flange from the inside..That will be a tricky repair. A couple ways to go about it.. I think the best way would be to drill and tap then insert a stud and weld or brake in place. That will ensure proper centering.
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mepstein |
Jan 13 2021, 06:12 PM
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#17
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914-6 GT in waiting Group: Members Posts: 19,142 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Is there a riv nut type of fitting that can be used.
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dwelle |
Jan 13 2021, 08:23 PM
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#18
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Newbie Group: Members Posts: 13 Joined: 24-December 16 From: a town south of fresno Member No.: 20,693 Region Association: None |
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