Coolant loss

KevinS · Jun 12, 2016

Another Coolant Leak

Hello all. I just purchased a '69 32 footer with a Ford 120 Lehman. I've got a coolant leak somewhere on the top starboard side. I thought it was the hose going to the coolant tank. I replaced it but still leaking from somewhere up there. Also, looks like the cap is original. 4lbs, no where I can get one?

KevinS
Bremerton, WA
USA

KevinS · Jun 12, 2016

Sorry didn't see the answer posted. Really an auto parts store, Looks a lot bigger than my car one.

RT Firefly · Jun 12, 2016

Greetings,
Mr. K. American Diesel American Diesel Corp can supply most, if not all, parts for your 120 Lehman. Really helpful with advice and information as well. Another source is Bomac Marine. Ford Lehman Engines | Parts | Service | Bomac Marine

BruceK · Jun 12, 2016

There is a tube inside the FL120 expansion tank which leads to the overflow tube. It can get blocked, preventing overflow and causing pressurizing. It has to be kept clear, if blocked the 4lb cap is the most likely vent alternative.
Also, there is an ADC kit which modifies the filler neck and adds a coolant overflow containment and return bottle. It uses a higher pressure cap, 8lbs I think. There is a Mercruiser kit which does something similar, at less cost.

Coolant loss

KevinS

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KevinS

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RT Firefly

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BruceK

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