do mgb's get block freeze out plug leaks often? Not due to freezing coolant or rusting out.

Asked by Robertbean Nov 25, 2015 at 02:14 PM about the 1976 MG MGB Base

Question type: Maintenance & Repair

2 different block freeze out plugs developed leaks on a motor that was rebuilt at a shop fairly recently. The freeze out Plugs were new at that time. I replaced the plugs myself with ones ordered from Victoria British using Permatex #1 sealant on their edges & walloped them fairly hard with a big ball piene hammer until they were dented inward slightly. So far no leaks after a few hours of running.

2 Answers

I suspect the shop just did not install them correctly. Always run at least 50-50% anti-freeze though.

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They either leak due to improper installation or when they rust out. Rusting out can be mostly eliminated by keeping the engine coolant fresh and never using just water.

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