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oil loss out of the vent tube above 60 mph.

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Dburdick Avatar
Dburdick Silver Member Douglas Burdick
Winnsboro, SOUTH CAROLINA, USA   USA
1957 MG MGA "Mary"
1969 MG MGB "Doubtfire"
1969 MG MGB "Mrs Doubtfire"
1978 MG MGB    & more
What would cause my 1957 MGA with the original 1500 engine to lose/blow excessive oil out the vent tube on the side of the tappet case at speeds above 60mph? I never see any smoke out of the tailpipe, and the plugs are good. It just seems to lose oil above 60, whereupon the oil gets on the exhaust and stinks up everything!

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JimNH Avatar
JimNH Jim Mail
Nashua, New Hampshire, USA   USA
1957 MG MGA "Camilla (the Other Woman)"
I have seen this after sustained high speed running - like on the freeway for an hour or more...but not usually an issue most of the time.

wyatt Avatar
wyatt Silver Member Wyatt W
penguin point, drift ice, Antarctica   ATA
could be vacuum draw

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Rob Z Avatar
Rob Z Silver Member Rob Zucca
Camarillo, CA, USA   USA
1960 MG MGA
Is the stock valve cover and hose to the front air filter in place? There is also a baffle/filter inside the tappet cover where the draft tube attaches. These are sometimes missing. The material in the baffle would catch oil and divert it back down toward the sump.



"Time flies like an arrow......Fruit flies like a banana"

bobs77vet Avatar
bobs77vet bob K.
northern Va, Va, USA   USA
why would it not be blow by? what is the compression of the cylinders?

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