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Joe K · 10-23-2019, 07:40 AM

If the crack does not "extend" - the transmission can be removed, the contents taken out, cleaned and blasted, and either brazed, or simply paint the inside with "Glyptol" which is a red paint-like substance used frequently in electric motor rebuilds.

Formally an "insulating varnish" Glyptol is alcohol based, paints on, and once set is IMPERVIOUS to oil. Many race car internals are painted with Glyptol simply to seal the cast iron case-work against foundry grit coming loose inside the case and ruining an engine or gear train. It keeps the box cleaner in service (cleanliness is next to longevity in machines) and makes service and subsequent cleaning faster and easier.

Glyptol has some inherent flexibility - its used on electrical windings which can move under the magnetic flux of a motor - so when you reinsert the plug and tighten, even though you may spread the crack a bit, the Glyptol will likely bridge it and seal.

Brazing may be a possibility for repair - but like me trying to braze a cracked iron pot, once the crack starts it may be impossible to stop - you may chase that crack all the way up into the bearing recesses - in which case it's junk.

New cases are around. I have at least two extra transmission cases here. You'll pay more for shipping than the case and possibly the entire transmission will sell for at an antique auto flea market.

Joe K

10-23-2019, 07:40 AM	#16
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: Drain plug If the crack does not "extend" - the transmission can be removed, the contents taken out, cleaned and blasted, and either brazed, or simply paint the inside with "Glyptol" which is a red paint-like substance used frequently in electric motor rebuilds. Formally an "insulating varnish" Glyptol is alcohol based, paints on, and once set is IMPERVIOUS to oil. Many race car internals are painted with Glyptol simply to seal the cast iron case-work against foundry grit coming loose inside the case and ruining an engine or gear train. It keeps the box cleaner in service (cleanliness is next to longevity in machines) and makes service and subsequent cleaning faster and easier. Glyptol has some inherent flexibility - its used on electrical windings which can move under the magnetic flux of a motor - so when you reinsert the plug and tighten, even though you may spread the crack a bit, the Glyptol will likely bridge it and seal. Brazing may be a possibility for repair - but like me trying to braze a cracked iron pot, once the crack starts it may be impossible to stop - you may chase that crack all the way up into the bearing recesses - in which case it's junk. New cases are around. I have at least two extra transmission cases here. You'll pay more for shipping than the case and possibly the entire transmission will sell for at an antique auto flea market. Joe K __________________ Shudda kept the horse.