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Head Bolts

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Ian D
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Head Bolts

Postby Ian D » Fri Feb 03, 2017 12:20 pm

Hi Folks
Regarding Johns advice about solving my water leak from the front of the head
Do I need to seal/put PTFE tape on all of the head bolt threads?
Or will sealing the front centre head bolt suffice?
I didn't put any sealant/tape on any of the head bolt threads during rebuild as I wasn't aware of the potential issues - perhaps I should of?
Tried to PM you John but message wouldn't send fro some reason
Regards
Ian

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Re: Head Bolts

Postby ScottyD'sdad » Fri Feb 03, 2017 12:43 pm

use a liquid sealer, not tape, on the bolt threads. The head bolt threads go into the water jacket, and coolant can creep up the threads, and out the top.
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Re: Head Bolts

Postby outdoors4evr » Fri Feb 03, 2017 12:53 pm

All bolts that enter the water jacket. (All of the head bolts) I use Permatex Form-A-Gasket.
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Re: Head Bolts

Postby Slim140 » Fri Feb 03, 2017 1:04 pm

outdoors4evr wrote:All bolts that enter the water jacket. (All of the head bolts) I use Permatex Form-A-Gasket.

That works great until you need to re-torque them, then it tears. Go to your local hardware store and get some thread paste sealer (like for natural gas pipe), it will be in a plastic bottle or a can with a brush attached to the lid.
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Re: Head Bolts

Postby outdoors4evr » Fri Feb 03, 2017 1:36 pm

Should have been more specific. Permatex Form-A-Gasket #2. (Remains Flexible) The #1 will harden.
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Re: Head Bolts

Postby artc » Fri Feb 03, 2017 1:48 pm

i use the aviation form a gasket. there are two head bolts that do not enter the water jacket. they go into the exhaust. but i coat them anyway.

Pay particular attention to the front center head bolt, as it is cross-drilled for the air cleaner.
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Re: Head Bolts

Postby Stevetractor » Fri Feb 03, 2017 3:56 pm

That aviation form a gasket is great stuff. I use it on both sides of all paper and cork gaskets. Absolutely no oil weeping on new paint as long as u clean it off around where it squeezes out. It doesn't harden so I would assume it would work well on head bolts. FYI it's a permatex product and comes in a jar similar to antiseize with a brush.

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Re: Head Bolts

Postby John *.?-!.* cub owner » Fri Feb 03, 2017 4:15 pm

outdoors4evr wrote:All bolts that enter the water jacket. (All of the head bolts) I use Permatex Form-A-Gasket.
Actually, 2 or 3 of them extend into the manifold ports rather than the water jacket, but I do not discriminate, I use sealer on all of them. I have used the TFE paste for the last few, but the PermaTex Aviation gasket stuff is good too. Remember, any thread compound reduces friction, so you need to torque to a little less than the 45 ft/lb in the manual.
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Ian D
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Re: Head Bolts

Postby Ian D » Fri Feb 03, 2017 4:47 pm

Many thanks to all - knowledge is a great thing!
Regards
Ian

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Re: Head Bolts

Postby ricky racer » Fri Feb 03, 2017 4:50 pm

artc wrote:Pay particular attention to the front center head bolt, as it is cross-drilled for the air cleaner.


There's a tidbit of information I didn't know or didn't remember. Thanks for the info.
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Re: Head Bolts

Postby John *.?-!.* cub owner » Fri Feb 03, 2017 6:10 pm

I learned that tidbit the hard way a few years ago. I had one that would only leak after it had been shutdown a while, and by the time I came back the next day the trails down the front of the engine would be gone, and the only evidence a few drops under the front of the tractor. i finally used one of Eugene's tricks, putting some talcum powder on the front and looking for the trails in the powder. I pulled the head to look for a crack, and discovered the holes were cross drilled. :oops: Later I found a diagram showing it in one of the manuals, but don't remember where now.
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Re: Head Bolts

Postby Ian D » Fri Feb 03, 2017 6:26 pm

Yeah, now I know this it all makes sense - I have googled "Permatex Form-A-Gasket #2" and its readily available here in the UK so I will order some now and get it early next week, get the job done and try and start it for the first time since rebuild - then I might be back on here asking you guys more questions!! hahaha! - I like the talcum powder idea - superb!!
Best regards
Ian

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Re: Head Bolts

Postby twotone » Fri Feb 03, 2017 9:17 pm

I also use Permatex #2 on just about everything.
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