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!