There she blows

Technical MGB discussion
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themartino
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Joined: Thu Jun 18, 2026 7:38 pm
Forename: Martin
Surname: Hewitt
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There she blows

Post by themartino »

My ‘75 BGT suddenly started leaking oil through the dipstick.
I did an oil and filter change, then I also replaced the crankcase breather box with a new one. I also checked all breather pipes etc for further blockages or sludge.
The car’s not smoking at all and the oil pressure is perfect across the the rev range. There is no drop in performance and the oil remains crystal clear.
After cleaning the carbs etc and reassembling it’s still leaking via the dipstick. Does anyone know if it’s possibly the pressure relief valve ? 🤷🏻‍♂️
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Paul Scott
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Location: Milton Keynes

Re: There she blows

Post by Paul Scott »

Have you changed the oil cap?
Should be vented type

I'm sure there will be more ideas soon.

Welcome to the forum

Paul
1975 MGB Roadster
Webguru for MGB Register
themartino
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Joined: Thu Jun 18, 2026 7:38 pm
Forename: Martin
Surname: Hewitt
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Re: There she blows

Post by themartino »

Thank you yes, vented cap fitted… and weeping oil!
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Issug987
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Forename: Mike
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Re: There she blows

Post by Issug987 »

Have you checked (removed & cleaned) the side cover? It has a kind of wire wool filter in it that can get gunked up..the wire wool corrodes too, so its a bit rubbish....
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