[singleminded]

I've heard of them cracking (rare) but not desoldering..Glad you found the problem quickly though. John

[andrwboul]

Hi, for anyone who may be interested it turned out the return pipe within the oil tank had desoldered and was allowing oil to flood through.

[andrwboul]

Hi Thomas, thank you for the information. Kind Regards

[Thomas]

Hi Andrew (?), that might be sludge at the ball valve. You can find a decription here on page 47:
http://www.marston-sunbeam.org/technicalNotes/model9EngineRebuild.html
Cheers, Thomas

[andrwboul]

Hi, new owner 1938 Model 8. My bike wet sumps a good litre + overnight, any thoughts what maybe wrong ?