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Old 08-26-2017, 05:04 PM   #1
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Finally found my leak, now need to fix it

For some time I had a small oil leak on my engine and was not able to find it ( maybe it was too obvious). This morning on my way to my anchor spot I finally found it.

The leak is on the T fitting on the engine block where my 2 oil pressure sender are connected.
On the picture below it is the red T on the block and the leak is at the connection on the engine block
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Now I need to fix this and I am thinking either to use teflon tape on the fitting thread or some kind of liquid seal.

Any advice?

L
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Old 08-26-2017, 05:32 PM   #2
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Teflon tape should be good if i recall msds says up to 500 degrees Fahrenheit. I never liked the ptfe goop when i used it for propane fittings.
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Old 08-26-2017, 05:53 PM   #3
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You could try RectorSeal #5 or 7. You can buy at most of the box stores.

RectorSeal® No. 5® Number 5 - RectorSeal
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Old 08-26-2017, 06:01 PM   #4
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You could try RectorSeal #5 or 7. You can buy at most of the box stores.

RectorSeal® No. 5® Number 5 - RectorSeal

Sounds a bit like PreparationH - does the same thing I guess - seals holes
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Old 08-26-2017, 06:01 PM   #5
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Just interested: why do you have 2 x oil pressure senders there? or is one a switch?
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Old 08-26-2017, 06:14 PM   #6
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Finally found my leak, now need to fix it

Thank you TowLou was wondering if teflon was sustaining high temps.

Thank you Larry will take a look at this one.

Lol @ BrisyBoy, not sure prepH would do the trick !

Aquabelle, I have two senders, one for the flybridge gauge and one for lower helm gauge.

L
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Old 08-26-2017, 07:08 PM   #7
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Lou....you probably know you can get a "2 station" single sender that will do that for you (send correct electrical signal to 2 x gauges).
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Old 08-26-2017, 07:14 PM   #8
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oil leak

It is my understanding that you should never use Teflon tape on oil fittings. Fragments may break off and clog small passages.

Ian
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Old 08-26-2017, 08:40 PM   #9
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Lou....you probably know you can get a "2 station" single sender that will do that for you (send correct electrical signal to 2 x gauges).


Yup but I prefer to have separate senders so if one fails I still have another reading. Allow to check if the issue is the sender or the oil pressure

L
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Old 08-26-2017, 10:57 PM   #10
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I would use Permatex thread sealant on tapered threaded fittings.
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Old 08-26-2017, 11:09 PM   #11
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Permatex and Rectorseal are good sealants for this application. Also Loctite makes two good thread sealants for oil/hydraulic use, not as a locker.

I do not use TFE tape anymore on oil or fuel systems. Used to do some Hydraulic work and TFE tape was verboten at the risk of the job. Not worth it. Not only that but bits of tape could and did cause very difficult to track problems.

Years ago I did use tfe tape on a NEW gear oil pressure sensor and when tested had no pressure. Darn, removed the sensor thinking it was faulty. Nope, a wee bit of the tape had covered the hole and blocked the oil. Faulty workmanship sure but still not worth the trouble. Cleaned it up and all was well. Used a sealant.

I do use tfe tape but the yellow gas rated stuff on water and such fittings.
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Old 08-27-2017, 02:02 AM   #12
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As many state Teflon tape has it's problems BUT 99% of them are operator issues when applying the tape here's how it should be Done

1) Pay attention and never let the tape cover the end hole (or even close it it)

2)When wrapping Teflon tape around the male edge of the pipe/fitting it is important to wrap the tape in a clockwise direction. To do this hold the pipe in your left hand, or have the pipe/fitting to your left side if it is a mounted pipe/fitting. Put the tape on the threads and run the tape around the threads BUT NOT over the top of the fitting.

3)Depending on the density of the tape, you may wrap the tape two to three times ONLY. If you have a thicker (4 mil) density then two wraps should be adequate. However, if you are using a 2 mil or less density tape, then at least three wraps will ensure that the seal is sound.

4)Make sure that the tape wrap is tight enough to adhere to the shape of the threads. When you attach the two sides of the pipe make sure that no tape has overlapped on the open end of the pipe.

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Old 08-27-2017, 08:25 AM   #13
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I would use permatex number 2.
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Old 08-27-2017, 09:46 AM   #14
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I would try tightening it.
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Old 08-27-2017, 10:04 AM   #15
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Yep, try tightening first. Tapered threads seal themselves mostly, without needing any goo.

You really should have an oil pressure alarm switch, a functioning alarm system is better than watching gauges.
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Old 08-27-2017, 10:11 AM   #16
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One of the reason tapered threads leak is due to over tightening which will damage the threads. These threads should be tightened until they do not leak and a very little more.
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Old 08-27-2017, 11:13 AM   #17
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I would be concerned that you have 2 sending units hanging off the second of two T's. You try to set up your sending units so that you have only one t there.

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Old 08-27-2017, 11:27 AM   #18
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That is a lot of mass sticking out the side of a vibrating diesel. See if there is any way to reduce the mass or shorten the shorten the lever arm. Perhaps a different fitting that mounts the big duced vertically instead of sticking out.

Rector seal is what I use and while NPT fittings are tapered to seal themselves once used they don't seal as well. You will probably need a new fitting at the block so that when tight is will line up with that tube.
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Old 08-27-2017, 11:54 AM   #19
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Quote:
Originally Posted by Ski in NC View Post
Yep, try tightening first. Tapered threads seal themselves mostly, without needing any goo.

You really should have an oil pressure alarm switch, a functioning alarm system is better than watching gauges.


I will try to tight it but I will need to be able to add a full turn as the line going out (red one on the pic) is a solid pipe that I will need to keep in the same position.

So you would recommend me to have a single sender dual station plus an alarm in place of two senders single station?

L
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Old 08-27-2017, 11:58 AM   #20
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I did not thank all of you individually but you can all receive my gratitude for your help

L
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