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Machine Shop and Tool Talk Shop Equipment, fabrication, repairs, how to fix it, which tool to use for the job. Machinist shop talk, straight to the point.

Machine Shop and Tool Talk

Loctite, Teflon tape, Anti-seize?


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  #1  
Old 06-05-2019, 01:32:59 AM
mihit mihit is offline
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Default Loctite, Teflon tape, Anti-seize?

...And which to use where?

This has come up due to the Lister overhaul I'll detail on other threads.
Every stud has been pulled, a die run over it, and a tap in the hole, brand new nuts. Missing ones replaced.

My question comes in re-fitting the studs, many are through-drilled, so anything in the hole has the potential to migrate to the crank case (or water jacket), which makes me leery of using (copper) anti-sieze on the ends - I wouldn't want copper particles grinding away in the oil.

Being dissimilar metal (tensile steel into cast iron) they shouldn't gall, but either or both WILL rust and seize it, and the poor chap who wants to overhaul this in another hundred years will be cursing my lineage (like I did about the last git) So I was thinking some mild threadlocker (Loctite Blue?) or even teflon tape.

What say the stak?
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Old 06-05-2019, 05:59:11 AM
Hubbie Hubbie is offline
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Default Re: Loctite, Teflon tape, Anti-seize?

I've always use a thread sealant on any through bolts/studs. I just open the can and dip the threads in and screw in the block. It will coat the threads and is a hard set type. I get it at auto stores. Make sure you use don't use a soft set type as it will wash away in a water jacket. The stuff is black in color.
Also I almost always use the nichel based (silver/gray) antiseeze. Never used the copper.
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Old 06-05-2019, 08:37:53 AM
I like oldstuff I like oldstuff is offline
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Default Re: Loctite, Teflon tape, Anti-seize?

I use the teflon paste thread sealer that can be had locally at any hardware or plumbing store. It seals well and will last many years.

https://www.henkel-adhesives.com/us/...-sealants.html
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Old 06-05-2019, 09:38:34 AM
RoFoCo RoFoCo is offline
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Default Re: Loctite, Teflon tape, Anti-seize?

Hi

I'm in the final throes of rebuilding the engine on my Titan 10-20. The head studs go through to the water jacket in the block. I've installed the studs with Stag Wellseal applied to the threads. It's a liquid product that doesn't harden.

A former Rolls Royce diesel development engineer introduced me to it. It's great stuff, and can be used on any metal to metal sealing application with or without a gasket (e.g. sealing welch plugs). It can be bought in a tube or in a tin.

Roger
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Old 06-05-2019, 04:15:32 PM
mihit mihit is offline
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Default Re: Loctite, Teflon tape, Anti-seize?

Quote:
Originally Posted by RoFoCo View Post
...Stag Wellseal applied to the threads. It's a liquid product that doesn't harden.

A former Rolls Royce diesel development engineer introduced me to it....
Well if it's good enough for Rolls Royce I'm sure it's good enough for me, and it seems to be available locally.

I might try half with this and half with a the hardening black and the other half with teflon paste and see how it goes.
Thanks all.
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Old 06-05-2019, 08:07:13 PM
sunshineman sunshineman is offline
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Default Re: Loctite, Teflon tape, Anti-seize?

Just use permatex thread sealant or Holden made their own cheap and it worked . Or plain old simple stag .
Sunshineman
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Old 06-05-2019, 08:18:03 PM
slip knot slip knot is offline
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Default Re: Loctite, Teflon tape, Anti-seize?

I put tons of SBCs together using nothing but coppercoat on the head bolts/studs. They thru drill into the water jackets. never had any leakage issues.
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