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Installing a temperature gauge and will be fitting adapters which have a fairly course thread in the head for the sender unit.
Is high temperature gasket type silicon OK to use as a thread sealer ??
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Silicone is not the best, but if it's all you have, then use it sparingly as a last resort. There's only 1 place I use silicone on a motor, and that's the end gaskets between the block & manifold on a Holden V8.
Loctite 567 (or an equivalent from permatex, holdtite etc) is what I like to use on coarse threads - it's like a paste.
But being a sender, it should be a tapered pipe thread, which need almost no sealant - relying on the taper to seal up, so a small amount of Loctite 569 (or equivalent) - which is more like a liquid of motor oil consistency, or even some light strength thread locker (like 222) will also seal it up fine.
You don't need high temp - anaerobic sealants/lockers are generally good for 150°C, and if the head gets that hot, there's something very wrong, and the sealant is the least of your worries. |
Cheers,
Mick
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 1 user thanked commodorenut for this useful post.
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As said you shouldn't need sealer. I only ever use thread tape on a pipe style thread. To be honest, you know it has to seal so I would use an anti seize compound to make sure it's easy to get out next time.
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thread tape should be more than enough the tapered thread will tighten as you do it up.
but do clean the internal an external threads.
if you use a strong thread sealer\locker you will regret it after spending 2 or 3 days extracting the broken remnants from the head or bl0ck.
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1 user thanked johnperth for this useful post.
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Thanks all for the information.
I am cobbling some fittings together to fit a small diameter VDO temperature sender to a brass hose barb to enable this to fit to a redundant heater hose.
The threads in the necessary adaptor and hose barb are fairly course so I am thinking should use a good sealer.
Is normal Teflon sealing tape suitable for high temperatures?
Is permetex gasket goo any good to seal threads?
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If that temperature sensor is a single wire type it will need to be earthed. It doesn't sound like it will be with that arrangement. Edited by user Saturday, 15 October 2016 8:27:56 AM(UTC)
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Originally Posted by: gm5735  If that temperature sensor is a single wire type it will need to be earthed. It doesn't sound like it will be with that arrangement. You are so right silly me thanks for the heads up completly missed this you would think being an electrician I would be right on to the earth return requirement . Must be the old age catching up with me (much older than the HR ) 
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Solder an earth wire to the sender. Thread tape will handle high temperatures.
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Teflon based products (like thread tape) are good to 260°C - more than double what it would ever see in your engine.
You will find the tapered thread will bite through the teflon tape when you tighten it up, and provide an earth through the exposed thread. |
Cheers,
Mick
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A little STAG jointing paste is all you need. Use on gas, water, oil, steam & compressed air. https://www.autobarn.com...ste-200-gram-tube-sg200
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I think the sender was being mounted into a heater hose, hence no earth.
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Thanks all for the helpful information.
Picked up some STAG yesterday and assembled with the Stag and some thread sealing tape and fitted earth wire all good ready to install
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