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Old 01-17-2010, 06:36 PM   #1
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Default Oil drain leakage

For some reason the diy 1/2 npt is still dripping a tiny bit of oil here and there. I've put jb weld around the seal several times(so the layer is pretty thick) but after a couple weeks of driving (or sitting) it has just enough oil leaking so you can touch it and feel it on your fingers. It isn't leaking down the tube and doesn't appear to be coming from anywhere else. I've replaced the drain hose with a better hose but still the same leak. Without ripping the bung out is there any other options besides more jb weld?
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Old 01-17-2010, 06:53 PM   #2
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I don't think plastering more jbweld will do anything. I think you didn't clean the area good enough with acetone before the jb weld so its not really bonding or developed leaks. I'd take it out, clean it very very thoroughly, and try again.


of course the best solution is to weld it like I did with mine. it was leaking too.
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Old 01-17-2010, 08:46 PM   #3
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Is it possible to have it welded while it is still on the car? I have a shop downtown that has done all my exhaust work and what not and I could see if I could scrape off the jb weld and have them weld it up for real.
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Old 01-17-2010, 09:02 PM   #4
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Its possible since I was going to do it while the engine was on the car and went under there with a welder just to see if its even doable. VERY VERY tight squeeze but "possible".
I took out my engine and did it properly though due to other reasons
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Old 01-17-2010, 09:05 PM   #5
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So any idea on removing jb weld?
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Old 01-17-2010, 09:14 PM   #6
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Never used it. No idea
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Old 01-17-2010, 10:21 PM   #7
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Looks like google is saying acetone and a dremmel...not sure if I want to take that route though.
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Old 01-17-2010, 11:08 PM   #8
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That's why, although a pain, its recommend to take the pan off. Most exhaust shops don't have a tig machine, which you'll need to weld to the pan. Your fitting isn't bottoming out before the threads get tight, is it?
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Old 01-18-2010, 12:09 AM   #9
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Quote:
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That's why, although a pain, its recommend to take the pan off. Most exhaust shops don't have a tig machine, which you'll need to weld to the pan. Your fitting isn't bottoming out before the threads get tight, is it?
What do you mean? I think it might not be screwed in enough...but not really much that can be done about it now.
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Old 01-18-2010, 12:16 AM   #10
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NPT fittings seal on the threads, not the flange of the fitting. If you tapped your threads too far, they'll be too wide and your fitting will bottom out before the threads seal.

Like so:
Name:  oildrain.jpg
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Old 01-18-2010, 12:20 AM   #11
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How far did you take the tap in? The first time i tapped my pan i didnt run the plug in as far as i should which gave very limited threads. NPT is designed to start and taper up so eventually it gets to a point where its tight. Unlike bolts which have the same thread.
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Old 01-18-2010, 02:12 PM   #12
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I put my tap about half way through. Also my flange looks like the "good" picture where it is not flush with the pan.

Edit> I think I might have uncovered a different problem, fuel leak. I'm pretty stuffed up right now and couldn't really smell the liquid. I had the g/f smell it and she said straight gas. I think I might be having a fuel leak that is dripping down somewhere and getting covered in grime/dirt so it has a thicker consistency.
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Old 01-20-2010, 10:19 PM   #13
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Okay never mind, turns out it was the oil drain leaking. I found this stuff called waterweld and it seems to have done a lot better sealing it...so we will so how this does.
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Old 01-20-2010, 10:25 PM   #14
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Did you use sealing copper washer?
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Old 01-20-2010, 10:37 PM   #15
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Quote:
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Did you use sealing copper washer?
What.....are you talking about??
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Old 01-20-2010, 10:43 PM   #16
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That's where I fucked up^^I didn't use any washers so now I'm using this to hopefully make up for it.
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Old 01-20-2010, 10:45 PM   #17
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Anyone tried something like this welded on the pan, instead of the npt?

Holley Performance Products -8 AN Male Weld Fitting 997108ERL

I ask because I'm going to be doing this soon.
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Old 01-20-2010, 10:47 PM   #18
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Just weld it...if this fittings fails, I'll just redo it the right way.
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Old 01-20-2010, 11:14 PM   #19
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I just drilled and tapped mine, inserted fitting with jb weld around the threads, and put a little bit around the perimeter once I tightened it.

No signs of leakage.
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Old 01-20-2010, 11:30 PM   #20
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Quote:
Originally Posted by Vashthestampede View Post
I just drilled and tapped mine, inserted fitting with jb weld around the threads, and put a little bit around the perimeter once I tightened it.

No signs of leakage.
i did the same except i used black rtv. i figured it's good enough to seal the pan to your block, plus it won't crack and is easily removed and redone.
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