VCCA Home Forums TECHNICAL - GENERAL Mechanical - Engine, Trans, etc Oil pressure line-207 engine

I have posted the ends of my oil pressure line. I'd like to make a new one but those fitting appear elusive. The closest I got was one parts store guy who said they were "tube thread". Can the fittings be reused on a new line or are they one use only? Are there fittings available that could effectively replace those? Otherwise I may have to reuse it.

Pat: I believe Long Island Corvette Supply has those fittings. I think they were a unique to GM .
Richard

Thanks Richard, I checked and they say the Hex is 5/16. Mine are 3/8 so are smaller. I'll email them to confirm.

Oops! 3/8 would be bigger but a second check showed that mine are indeed 5/16. So the Corvette supplies fittings will fit. Thanks muchly.

P.S. I went to the GM dealer here. The oldest mechanic rcognized it for what it was but wished me good luck in finding some.

Pat, glad they are what you need. You may want to buy several. They may be worth a lot of $$$ one day!
Richard

I will have to buy several. They won't take an order under $20. They also told me they are generally available at most auto parts store. I don't know about most..

Good that you found them, they are a compression fitting that squeezes down onto the tube and are not supposed to be reused.

Hey Ed,

Do you know of other sources?

Pat, you might also try Paragon Corvette Reproductions. They have a lot of GM repro. items. They may have a better minimum purchase policy. If any of these online retailers have a store front they may allow purchases below the minimum for over the counter purchases. Possibly a VCCA member Is near one of them and could grab a couple for you??
Richard

No Pat, I really don't. I didn't realize they were that rare. Did you try NAPA? I haven't bought any for years so I figured they were still available.

These oil fitting nuts are called "dole nuts".

Pat,

These fittings are called double compression fittings. The part shown in your photo is called a nut. The mating part, which screws into the engine block or the oil pressure gage, is called a male connector.

There may be more than one manufacturer, but Edelmann makes them. See the website, http://www.plews-edelmann.com/double-compression-fittings/

I believe your oil line is 1/8". The nut that you will need for 1/8" is Edelmann P/N 111200.

Napa carries these parts, and I have purchased them recently in 3/16" size to re-do the oil supply line to the rocker arms on a 216 engine.

Incidentally, you can re-use your existing fittings. Clamp the fitting in the vice by the hex head and saw off the tube flush with the tapered end of the fitting. Be careful not to use too much clamp force on the vice, as the fitting may become distorted. Use a fine tooth saw blade (32 teeth per inch) and go easy so the blade doesn't snag in the tubing and dislodge the fitting from the vise. Better yet, use an abrasive cutoff wheel in a Dremmel tool. After cutting off, use a drift punch to push the tubing out of the fitting. Then run an 1/8" drill through the fitting, starting the drill at the hex end of the fitting. The nut should now slip onto a new piece of tubing. In making the fitting up, slide the nut onto the new tubing and insert the tubing into the mating fitting on the block or the pressure gage. Be sure the tubing is pushed all the way into the fitting. Edelmann says run the nut down by hand till it stops, then tighten 1-1/2 turns with a wrench. That may be too much for a re-used fitting, so use your own judgement as to how tight to make it. Be sure to use a backup wrench on the mating fitting, especially on the oil pressure gage so you don't damage the gage. After tightening, loosen the nut and back it out to inspect. The nut should be crimped onto the tubing with at least 1/16" to 1/8" of tubing protruding beyond the end of the fitting. The nut may turn on the tubing, but it should not slide laterally on the tubing. If it looks good, reassemble and tighten. I doubt if the design department at Edlemann would sign off on this procedure, however, since you're dealing with low pressure (30 psi, max), it will work fine.

Regardless of whether you use new fittings or re-use the old fittings, remember to check them for leakage once you get the engine running.

Mark

I agree with Mark. Been there and done that.

Thanks for the answers. I also felt that if handled properly. Anyway, I found some at Benson's Auto Parts and theirs are made by Dominion Fittings. Probably both companies are Canadian.