Thread sealant

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Sailor
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Thread sealant

Postby Sailor » Tue Feb 03, 2015 10:56 pm

I'm installing the head on my engine tomorrow. As advised, I will be applying Permatex Thread Sealant with PTFE to the bolts which extend into the water jacket.

Until that recommendation was may I was going to use Permatex Anti-Seize on all the head bolts. My question is will the thread sealant provide the same anti- size benefits as the Permatex product?

Thanks,
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Re: Thread sealant

Postby tnestell » Wed Feb 04, 2015 9:55 pm

I would use the thread sealant as recommended. Sealing those threads should protect them. At least in my mind. Ted

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Re: Thread sealant

Postby Tractorboy3 » Thu Feb 05, 2015 7:56 am

Sailor wrote:I'm installing the head on my engine tomorrow. As advised, I will be applying Permatex Thread Sealant with PTFE to the bolts which extend into the water jacket.

Until that recommendation was may I was going to use Permatex Anti-Seize on all the head bolts. My question is will the thread sealant provide the same anti- size benefits as the Permatex product?

Thanks,
Larry

I see no-one wants to stick their neck out on this one...I had the same question when putting my 58 back together..So I couldn't decide what to do ..so I did both...Thread sealant on the bottom half of the threads to seal, and anti-sieze on the top half of the threads...
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Re: Thread sealant

Postby John *.?-!.* cub owner » Thu Feb 05, 2015 10:19 am

I think the reason no one will commit is that none of us have ever pulled head bolts out that we know what was used on them the last time they were out,which may be as much as 60 years ago. As for as the antiseize, I use it many places, but on the head bolts I use the TFE thread sealant. I used to use Copper Coat, till I had one leak, but ever since have used the TFE. One note, when using anti seize or sealant you need to reduce the head bolt torque a little, approximately 10%
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Re: Thread sealant

Postby Doodle » Thu Feb 05, 2015 10:23 am

I have no experience with this product on head bolts. However I use it in general plumbing situations with pipe thread fittings. Other than a sealant, it aids as a assembly lubricant with pipe thread. Removal, I would say is slightly easier than no sealant used. It is definitely not equal to never seize for removal and I would say if sealant is not the objective on some of the bolts, I would use never seize. Again, I nave no experience with your application, just relaying my experience in other applications.

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Re: Thread sealant

Postby Stanton » Thu Feb 05, 2015 11:40 am

Personally, I used Copper Coat anti-seize on my head threads. But the product description for regular Permatex Thread Sealant does not say it eases in disassembly, but the High-Temperature Thread Sealant does.

Product descriptions:

Regular: http://www.permatex.com/products-2/prod ... tfe-detail

High-Temp: http://www.permatex.com/products-2/prod ... ant-detail

Since a Cub engine temperature may reach coolant boil points (a little over 212 degrees F), then you are probably okay with the regular formula.
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Re: Thread sealant

Postby Jim Becker » Thu Feb 05, 2015 11:53 am

One more point hinted at in your question but not addressed: Whatever you use, use the same product on ALL HEAD BOLTS whether they open into the water jacket or not. Otherwise, you won't know when you have them all torqued to the same tension. Within reason, having them all torqued the same is more important than the absolute value they are torqued to.

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Re: Thread sealant

Postby Tractorboy3 » Thu Feb 05, 2015 12:01 pm

Jim Becker wrote: having them all torqued the same is more important than the absolute value they are torqued to.

:Dito: absolutely....
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Re: Thread sealant

Postby Sailor » Thu Feb 05, 2015 1:25 pm

Thanks for all the inputs. I put the head on yesterday and ended up using the sealant on all the threads. I have always heard that torque measurements were based on using only light oil, on threads, so I backed off the last torque setting by a couple of pounds, last round was somewhere between 40-45 ftlbs.

It's suppose to warm up a little here in Kentucky the next couple of days which will give me a chance to put some paint on it. :D
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Re: Thread sealant

Postby Doodle » Thu Feb 05, 2015 4:43 pm

Jim Becker wrote:One more point hinted at in your question but not addressed: Whatever you use, use the same product on ALL HEAD BOLTS whether they open into the water jacket or not. Otherwise, you won't know when you have them all torqued to the same tension. Within reason, having them all torqued the same is more important than the absolute value they are torqued to.


Makes perfect sense and learned something again.


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