So i'm working on a 30's Plymouth with over heating issues. I found in the upper passage a tan, rubber like film coating portions of the passage after inspecting with a bore scope. Has anyone seen this before? I suspect somewhere along the line some sealing method was used and failed as it appears the head has been removed possibly to replace the head gasket. A lot of the film is broken up like it dried up and separated and is now stuck some place after running the car which sat for years, i suspect this is my issue. Never the less i need to figure out how to get all this gunk dissolved and removed. I attached several photos of the mystery tan gunk. Any help or insight would be greatly appreciated. Thank you.
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. In the1930s & 40s, Plymouth used last year's Dodge engines. Dodge used a sheet metal tube in the block to get coolant to the rear cylinders. This usually rusted out leaving rust debris at the bottom of the water passage, further exacerbating cooling. While you have the block out of the vehicle and upside down, try to find a chemical to remove the tan gunk. . . Sorry I didn't exactly answer your question. . Lou
Starting in about '36 or '37 Plymouth started using a 218 inch engine that they continued to use into the late 1950s. My friend has a 1935 Plymouth PJ which has a smaller displacement. I don't recall its size or the size of previous 6 cylinder models. I can never tell what I am seeing with those bore scopes and today is no exception. I would take advice from Lou and check out the distribution tube situation. Good luck with your project,
Ive discovered, by removing a glob of goo and soaking it with alcohol (air break antifreeze) that once the alcohol evaporates, the goo dries up and turns into near gold fish food. The idea is to run a boat load of antifreeze through the block, let it dry and flush it. anyone see anything wrong with this? I've considered gasoline also, havent tested the evaporation theory yet tho.
