Morris Minor Owners Club

I had a call from my daughter yesterday saying that her car wasn't quite right and the heater had gone cold. So I assumed that the water had run out somehow. I went armed with a big bucket of water and sure enough the rad was showing no fluid at all. Filled it up and watched water leaking from the 'breather' hole halfway along the water pump body. She drove it home and I followed. Waited for the engine to cool down and went to investigate, no more leak. Topped the rad up, ran the engine, still no leak. Left it overnight and checked again, still no leak, with both the engine running or stopped. I will be changing the pump at the weekend, but I have never come across this self fixing feature before, any ideas?

Eric

probly just a bit of crud in the water finding its way into the hole ... very clever !

grainger

Hello Eric,
or a piece of crud getting between the two halves of the (spring loaded) seal then passsing out again.
A very rare occurance I'd say.

Alec

How odd! Or seal/cast housing contracting upon cooling?
Had similar on BMW bike-that one ~stopped~ leaking when warmed up.