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Old 12-29-2013, 06:00 PM   #1
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Lehman 120 Oil Cooler Question

Quick question for y'all.

I purchased new oil coolers for my Lehman and have had conflicting advice on whether or not to use any type of thread sealer on the oil line adapters where they thread into the cooler.

I'm talking about the little brass fitting where it threads into the oil cooler itself, not the end that the actual oil line threads on to.

Was told yes and no when I asked around, so which is it?

Cheers.
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Old 12-29-2013, 06:08 PM   #2
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Use Teflon tape on tapered threads, never on straight threads. For oil or fuel etc., use the yellow tape.
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Old 12-29-2013, 08:14 PM   #3
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i would use it. I can't speak specifically to if you NEED it or not but i can tell you that if you are careful and don't get any in the openings it will not hurt anything and it will make it easy to remove should the need arise.
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Old 12-29-2013, 09:06 PM   #4
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I think they are flare fittings...are they? If so... no tape or sealer is usually recommended...but plenty of people use either /or and if careful...no harm is done.
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Old 12-30-2013, 08:31 AM   #5
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On the 2 fittings that thread into the cooler I'd use RectorSeal number 5 or 7. No tape. On the flared hose connections, you shouldn't need or use anything.

Pipe Thread Sealants RectorSeal
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Old 12-30-2013, 08:39 AM   #6
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Quote:
Originally Posted by psneeld View Post
I think they are flare fittings...are they? .
The one I have here at home is NPT thread (pipe thread).
I would use teflon tape or paste. When I put teflon tape on oil or fuel fittings I make sure to leave the first two threads bare so as not to get the tape into the medium.
You could also use something like Loctite 242, etc.
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Old 12-30-2013, 09:00 AM   #7
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Worth a read:

http://www.useloctite.com/filephotos...ch_article.pdf
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Old 01-02-2014, 12:25 PM   #8
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Thanks for the input, they are tapered threads so my gut was telling me to put some type of sealer on them.

Back to my winter project....

-- Ryan
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Old 01-02-2014, 07:04 PM   #9
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Sealant on tapered threads= yes
As important, use two wrenches so as not to kink the fittings which are just soldered into the thin copper shell. Squeeze the wrenches to each other 1/8 turn at a time.
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Old 01-02-2014, 07:22 PM   #10
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As important, use two wrenches so as not to kink the fittings which are just soldered into the thin copper shell. Squeeze the wrenches to each other 1/8 turn at a time.
That is a brilliant bit of advice, I hadn't even considered that possibility.

Thanks!
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Old 01-02-2014, 07:43 PM   #11
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I work with a lot of heavy duty mechanics. All journey men. To a man they say never use Teflon tape on any fuel fitting. If you must, use pipe dope. Locktite Teflon paste. It comes in a white squeeze tube.
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Old 01-02-2014, 09:10 PM   #12
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Kinda like never use a screwdriver for anything but driving a screw...good advice but fot the amateur who doesn't always have the right stuff in the tool bag...

As long as there a filter between the fitting and a precision part of the engine I don't see a huge issue, especially if you are careful with the amount, and wrapping of the tape.
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Old 01-02-2014, 10:10 PM   #13
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Quote:
Originally Posted by grahamdougladd View Post
I work with a lot of heavy duty mechanics. All journey men. To a man they say never use Teflon tape on any fuel fitting. If you must, use pipe dope. Locktite Teflon paste. It comes in a white squeeze tube.
I have had great luck with Loctite 745. Full disclosure, my wife is the head of eBusiness there.

If you call the tech dept. a live person will answer the phone and give expert advise for your intended use.

Rob
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