HEAD STUD SEALANT

[RICKG]

Would a guy be better off using Permatex 1 (hardening)
or permatex 2 (non-hardening) to seal coolant leaks @
head studs. Both 1 and 2 are mentioned in previous posts.
_________________
keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a

[evanso1975]

From the Permatex website:

Permatex® Form-A-Gasket® No. 1 Sealant
Fast-drying, hard-setting sealant designed for sealing rigid materials and flanges, or patching holes and joints where permanent assembly is desired. Temperature range -65°F to 400°F (-54°C to 204°C); resists common shop fluids and fuels.
Suggested Applications: Freeze plugs, threaded connections, manifold gaskets

Permatex® Form-A-Gasket® No. 2 Sealant
Slow-drying, non-hardening sealant designed for sealing cut gaskets and stamped parts. Allows for easy disassembly if required. Temperature range -65°F to 400°F (-54°C to 204°C); resists common shop fluids and fuels. Use where sealing is more important than adhesion.
Suggested Applications: Valve cover gaskets, oil pan gaskets

That bit I highlighted in bold text should answer your question. However, as with all questions in life the manufacturer should know best.

Their contact details are here:
http://www.permatex.com/about_contact.htm

Wbr,
Owen.
_________________
Owen

1951 US Air Force M38
1944 F-1 1/2-ton Airdrome Trailer
1940 C15 Chevrolet CMP 11-cab
1939 DKW KS200 Motorcycle
MVT # 19406

[artificer]

Any GM dealer will have head/thread stud sealer in a 4oz can. Dip studs in sealnt & screw in finger tight into block ensuring all threads are @ the deck level [do not torqe the studs by double nutting or any other method].
_________________
John GIBBINS
ASE Master Medium/Heavy Truck & Auto Technician 2002 USA
Licensed Motor Mechanic NSW # MVIC 49593 Current
YOU CAN'T TROUBLESHOOT WHAT YOU DON'T UNDERSTAND

[RICKG]

Permatex tech support recommends neither 1 or 2.
They recommend #59214 hi-temp thread sealant.
Napa Balkamp # 765-2648 (4 mil tube), 765-1155 (50 mil tube).
_________________
keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a

[53a1]

I used the #59214 high temp thread sealant. Haven't had a problem yet. I also use the same stuff on all my pvc plumbing.

Just a guess but if I were to choose between the hardening & non-hardening I'd go with the non-hardening in the chance it might mess up the threads if you remove the studs. Plus when you re-torque, you need it to be pliable.
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'53 M38A1 X2

[wesk]

Remember you do not torque or retorque head studs. You torque and retorque head nuts on an L134. The stud is not suppose to move during either process so a hardening sealer on the threads is not an issue.

I've used Permatex 1 for 40 years without any problems. Yes there are newer, fancier and more specific products today that even cost more but are not really necessary on this 3/4 century old engine.
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

[skyjeep50]

I used the Permatex high-temp sealant on my M38 engine studs but after having some leakage issues went back to Permatex #1. The high-temp stuff was a rather thin, almost watery compound and the coarse threads of the studs seemed to me to require a thicker sealant. I'm sure the high temp sealer is good stuff for fine threads but maybe not coarse thread head studs installed finger tight - just my 2 cents.
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1951 M38

[53a1]

Thanks for pointing out my error Wes. I have head bolts not studs so the stuff I'm using is probably is not the best. FYI, you have to knead the tube before using the high-temp stuff or it's too runny.
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'53 M38A1 X2