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12-19-2024, 05:15 PM | #1 |
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Join Date: May 2016
Location: northern CA
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Help... Oil leaking from guage connection
I replaced the copper oil line with one from LMC. Oil is leaking around the tubing at the oil gauge. The connection fitting is tight.
It is leaking around the hole where the copper tubing goes through the hole in the connection fitting. Anyone ever had this issue and how did you fix it? Thanks in advance |
12-19-2024, 06:13 PM | #2 |
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Join Date: Jun 2022
Location: San Ramon,CA
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Re: Help... Oil leaking from guage connection
could be the nut is tight, but the flare isn't seated properly
NOTE: It ain't a flare, see below
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1970 C10 Custom longbed 350/350 Last edited by Rust_never_sleeps; 12-20-2024 at 01:49 AM. |
12-19-2024, 06:50 PM | #3 | |
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Re: Help... Oil leaking from guage connection
Quote:
Try loosening and tightening the nut several times to shape/seal the flare of the line with the guage. This is a great technique I learned here on this board for many hydraulic connections.
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1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, HEI, mostly stock, Survivor. |
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12-19-2024, 07:25 PM | #4 |
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Re: Help... Oil leaking from guage connection
It possible you have over tightened the fitting. The fitting should be snug not tight to seal. Also did you inspect the end of the line carefully? It's possible that there is a burr or other deformity preventing the tubing from forming properly to the ferrule.
I would pull it apart inspect the end of the line for defects and then if the ferrule is still loose on the tubing try what slikside recommended. If the ferrule is tight on the tubing and the tubing is deformed by the ferrule then it's time to cut it off and start again with a new ferrule. Good luck.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
12-19-2024, 09:31 PM | #5 |
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Re: Help... Oil leaking from guage connection
If you can not get it to seal, an old trick I once used was to hole punch a piece of aluminum foil. Poke small hole in center so it will fit on end of tube fitting. It will act like a conical gasket. Worked on a truck i had 40 yrs ago.
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12-19-2024, 10:05 PM | #6 |
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Join Date: Dec 2017
Location: Elkhart, Texas
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Re: Help... Oil leaking from guage connection
Some of the "hints & tricks" offered here are for sealing a flare fitting.. The oil pressure gauge fitting does not use a flare fitting, it uses a fitting referred to as a compression fitting. Google the term and learn how the fitting works.. Do as HO455 suggested, and your leak problem will be solved...
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12-19-2024, 11:26 PM | #7 |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
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Re: Help... Oil leaking from guage connection
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Sorry, but you would all be wrong. The fitting for the gauge is called a "Compression Sleeve Nut". The stock block adapter uses the same fitting. Here is a picture of it. If your oil line has any other fitting for the oil pressure gauge it will probably not seal. Here is a picture of it posted by LostMy65..... Here is a "how to" thread I posted about making a new oil line with original style fittings.. https://www.67-72chevytrucks.com/vbo...d.php?t=613238 .
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 12-19-2024 at 11:43 PM. |
12-19-2024, 11:39 PM | #8 |
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Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,680
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Re: Help... Oil leaking from guage connection
I was thinking ferrules at first, but then got to thinking that I was wrong, and deleted my post. Along came LockDoc with the correct item.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
12-19-2024, 11:44 PM | #9 | |
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Re: Help... Oil leaking from guage connection
Quote:
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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12-20-2024, 11:16 PM | #10 |
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Location: Ben Wheeler, TX
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Re: Help... Oil leaking from guage connection
Just had the same problem after rebuilding my dash. Go to NAPA and get the ferrule(not expensive). Cut off the old ferrule and slide the new one on then tighten. These ferrules create their own crimp and don't do well the second time around.
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72 Sierra Grande 2500 BB 72 Sierra 2500, 42K miles, factory buckets 72 Cheyenne 20 72 Chevy SWB, Factory BB, Leaf Spring |
12-20-2024, 11:37 PM | #11 |
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Location: Ca
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Re: Help... Oil leaking from guage connection
You guys got wound up on this one. Instead of pointing fingers offer solutions. Maybe I was not clear enough. A compression nut seals on two surfaces. Similar to how a compression fitting works. The outside of the nut on the angle surface from threads to tip seals against the female angled surface of the guage fitting. The nut also seals to the outside surface of the tube against the surface of the hole in the nut. Both are metal to metal contact and seal using compression force as the nut pushes on the angled surface in the guage fitting. If the leak is past the nut on its outside surface and past the threads, the aluminum trick will work as it did for me. If the leak is past the nut and tube surface, then you will need to determine if you can get away with a repair but more likely need a replacement.
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Yesterday, 05:05 PM | #12 |
Registered User
Join Date: May 2016
Location: northern CA
Posts: 20
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Re: Help... Oil leaking from guage connection
Thank to all... time to crawl under the dash again ... after it quits raining...!!
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