Oil temp sensor leaking

locky · Posted: Fri Jul 05, 2013 10:34 pm Post subject: Oil temp sensor leaking

Installed an oil temp sensor today on the top of my remote filter adapter.. 14x1.5 VDO. I used a 1/2 inch drill bit and then appropriate size tap. Now I have oil pissing out of the top of my adapter. Wondering what to use on the threads. Silicone? Teflon? Any suggestions?

perello · Posted: Sat Jul 06, 2013 6:43 am Post subject:

I did use a time-sert, only ones I trust

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Semper_Dad · Posted: Sat Jul 06, 2013 9:03 am Post subject: Re: Oil temp sensor leaking

mondshine · Posted: Sat Jul 06, 2013 9:05 am Post subject:

Unfortunately, VDO senders are grounded through the threaded body of the sender. Sealant will probably insulate this connection, or at least add resistance, which will alter the gauge reading.

You might be able to use a suitable ring terminal (and, depending on how deeply the sender is seated, maybe some thin washers as shims) under the sender to wire it ground it someplace else; allowing you to use sealant on the threads.
Here's a quick sketch:

Just keep the contact area between the sender and the ring terminal clean.

Good luck, Mondshine

locky · Posted: Sat Jul 06, 2013 9:46 am Post subject:

Thanks guys. I went with some loctite thread sealant. Applied as per Mondshines diagram. Also went with a copper crush washer. Going to let it cure and see what happens.

mondshine · Posted: Sat Jul 06, 2013 9:55 am Post subject:

When you are ready to start the engine, make up a jumper wire with a couple of alligator clips.
Warm up the engine and connect the sender body to a good known ground to test whether the gauge reading changes with/without the jumper wire.
This will verify the sender's connection to ground.

Good luck, Mondshine

locky · Posted: Sat Jul 06, 2013 10:15 am Post subject:

I will, thanks for the advice and diagrams. Its people like you that make this sight Mondshine.

locky · Posted: Sun Jul 07, 2013 2:34 pm Post subject:

Permatex thread sealant worked. I let it cure 24 hours and..... No leaks!!

Semper_Dad · Posted: Sun Jul 07, 2013 3:13 pm Post subject:

locky · Posted: Sun Jul 07, 2013 3:25 pm Post subject:

Semper, I don't have it wired up yet but did a test hooking up some jumper wires to the gauge while holding it in my hand. It worked. Once I get everything hooked up I will follow Mondshines recommendation and hook another ground up tp make sure my sensor ground is solid.

saddlesore1 · Samba Member Joined: November 20, 2006 Posts: 548

I used silicone. Did not disrupt continuity and worked great. I was worried it would not hold because of pressure but it does. I guess 25 lbs is not that much.

locky · Posted: Sun Jul 07, 2013 6:29 pm Post subject:

Went for a good drive and its still holding good. The one thing that is driving me nuts is the seal between the filter and the adapter. For some reason I can't seem to stop the leaking there. I took off adapter and layed a piece of 220 sandpaper on a flat surface and gave it a good sand. Put it all back together and it's still leaking. Not a ton but enough for it to get messy.
Evil or Very Mad


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