Thread: 1940 Ford Pickup

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More delays, this time a sad delay. My painter's mother-in-law passed away and family always comes first. We only have so many summers left so may you all have the best ones ever !

Sorry for the delay, but family first for sure.

HMmm. maybe I can make a post?? the page could be found??

anyway, I agree, the truck will wait - the family must come first. Hope they can find some peace.

Had a water temp sensor problem, guessing it was the Teflon tape. The gauge was off by 30 degree's compared to the sniper EFI ECU.. Temp gauge would only go to 150 degrees . I drilled a hole in the sensor bushing and soldered a ground wire to it, bolted other end problem solved . My painter is back working on my truck too.

Nice fix, but why not just remove the Teflon tape?

Agree, an awl or scribe will work .

Originally Posted by rspears

Nice fix, but why not just remove the Teflon tape?

Well I could have tried that but I thought it would leak anti freeze , the sensor/bushing screws into an aluminum block below the thermostat housing. Bad/good thing I now have and extra temp sensor because I replaced it 1st thinking that was the problem.

Originally Posted by Navy7797

Well I could have tried that but I thought it would leak anti freeze , the sensor/bushing screws into an aluminum block below the thermostat housing. Bad/good thing I now have and extra temp sensor because I replaced it 1st thinking that was the problem.

With a tapered thread and two relatively soft metals I'd say the chances of a leak are slim, but what I do in those cases where I wonder is only put teflon tape on the bottom half of the threaded adapters so that the top threads are metal to metal, ensuring the ground connection. Different ways to achieve the same end (started to say "skin the cat" but I guess that's offensive these days.... )

Originally Posted by Navy7797

Had a water temp sensor problem, guessing it was the Teflon tape. The gauge was off by 30 degree's compared to the sniper EFI ECU.. Temp gauge would only go to 150 degrees . I drilled a hole in the sensor bushing and soldered a ground wire to it, bolted other end problem solved . My painter is back working on my truck too.

JMHO, this is proof positive and contrary to some popular beliefs, the tape can indeed insulate the electrical connection or at least impede its ground conductivity (jumper wire proofing it).

There has actually been a long standing argument among some that this can NOT happen, lol. And yet, here it is, an electrical impedance of the ground connection to the sensor.
Usually, the brass threads on the sensor being tapered and soft are enough to create a good seal without any sealants required. Occasionally though if you must use a sealant it is best to use an automotive grade liquid type sealant, applied to the outside (male) threads only, ensuring a good ground connection and seal.

It really depends on how good the threads are machined on the fittings if you get a perfect seal or not. Most always tend to leak in my experience with no sealant on the threads. I've found the liquid type sealant works best though.

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Doors are finally done, electric windows with light gray glass.

That's purdy!

/\ /\ What he said /\ /\ /\ Gonna look great!

Thanks for the positive comments !

Originally Posted by 40FordDeluxe

It really depends on how good the threads are machined on the fittings if you get a perfect seal or not. Most always tend to leak in my experience with no sealant on the threads. I've found the liquid type sealant works best though.

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I have used RectorSeal No. 5 for years on water temperature sensors with total success. It has great sealing properties, lubricates, and remains soft so removal of a water sensor is easier. I do not believe it has any dielectric characteristics as evidenced by a continuity reading of zero ohms between the brass base of the water sensor and the aluminum manifold.