Crankcase ventilation emissions systems aren’t the most exciting part to rebuild on your MGB engine but they are needed (depending on who you talk to!) and certainly are a simple device on the 1967 MGBs. Of course as the years went on these systems became more and more complicated but at least we don’t have to worry about that.

Fortunately there aren’t many pieces in the actual crankcase ventilation valve but the parts do need to be in good condition. It sounds like if you have issues with the valve you can go through oil at an alarming rate, even for a British car.

After 50 years this area of the engine looked pretty ratty but the parts are now getting cleaned up to be reinstalled.

1967 MGB GT 18GB intake and exhaust manifolds with PCV
1967 MGB GT 18GB intake and exhaust manifolds with PCV

Overall the valve appears to be in good shape with just burned oil clogging it a little. I used some saw blade and router bit cleaner on these parts and the old oil almost floated off.

MGB crankcase ventilation valve before cleaning
MGB crankcase ventilation valve before cleaning

The connector pipe from the valve to the intake manifold is completely shot with no flexibility and lots of cracking. I’m not sure if air leaking into the system at this point would matter but it will get replaced anyway.

MGB pc valve and intake manifold
MGB pc valve and intake manifold
MGB PCV deteriorated connector pipe
MGB PCV deteriorated connector pipe

The crankcase ventilation valve parts after an initial cleaning. One more go should have them really clean and I’ll polish the parts at that stage. All of the hoses and the rubber diaphragm will be replaced. The old diaphragm I’ll keep as I’ve heard the replacements are not very good quality.

Cleaned MGB crankcase ventilation valve
Cleaned MGB crankcase ventilation valve

LEAVE A REPLY

Please enter your comment!
Please enter your name here

This site uses Akismet to reduce spam. Learn how your comment data is processed.