gaskets on John DeereH

[Otis Wolkins]

On a 1941 John Deere H should a gasket sealer be used on the block-to-case and on the head-to-block? I am a new restorer!!

 

[matthies]

Coppercoat spray used on the head gasket and yes on the block/case as the gaskets aren't what they used to be.

 

[dan_41jdh]

Matthies is correct - yes for both areas - and extremely clean surfaces are crucial. Scrape and wire brush those mating surfaces until rubbing them with a white, solvent-soaked rag does not show any discoloration. Using a sealer then fills any light scratches or machining marks that might provide a slight leakage path for coolants or lubricants. A well-known professional restorer told me recently that he has found some fresh, commercially available gasket material that was impermeable in the past has actually leaked though the material itself. So, it’s beneficial to use a sealer not only on the flat surfaces of gaskets, but a little on the inside edges as well to prevent disappointments due to unexpected leaks. (This recommendation does not apply to modern automotive gaskets, many of which have special coatings. If the gasket manufacturer’s instructions say “no sealants”, follow their instructions.) Although many like the various brands of “copper coat” sprays, being old-fashioned, I prefer the good old tried-and-true Permatex Aviation Form-A-Gasket #3. A thin coating on both sides of a gasket remains pliable, has a high temperature rating, is resistant to petroleum products and coolants, and does an excellent job of sealing.

 

[Otis Wolkins]

Thanks for both answers--I appreciate your input!

 

[MSD]

Permatex Right Stuff Black is a good gasket maker. Will work to seal the block to the case. We use it all the time on pulling tractors with way more compression than that H will have with no problems. Head gasket a coat of Copper Coat spray on both sides of the gasket is all we use also.

 

[Otis Wolkins]

I am going to take everyone's advice and I know it will turn out well!!
Thanks all.

 

[Mike(NEOhio)]

If the surfaces are good you should not need any sealers. The only place an H can leak block to case is the oil passage at the bottom and the pushrod openings at the top. Coolant doesn't touch the case. The head is a different story but if it's clean same thing. Just my feelings. I use a 14 inch mill file on any gasket surface to be sure.