I have a 1970 144 with a B20B engine. It recently began to smoke very badly and it began to constantly blow out the valve cover gasket. Upon inspection I discovered the person who had this car before me had the hose from the Oil separator on the crankcase going to the intake manifold and the hose from the valve cover (oil cap) going to the air filter. Based upon research I had done this was in reverse. Crankcase should go to air filter and Oil cap (on valve cover) should go to the intake. I reversed this and it stopped blowing out the gasket. But the oil system still seems to be under more pressure than one would think is normal. There is a large amount of blow back if you take the oil cap off. Also Oil is being blown into the air filter housing. The oil level is right in the middle, so I assume it isn't over filled. Also I have no antifreeze in the oil or oil in the antifreeze
I have cleaned out the Ventura (nipple like thing that screws into the intake and connects to the hose from the oil cap) and no change. I have also pressure tested the cylinders and 2 held out at 98% with 2% leak and 2 cylinders showing 20% leak. I have seen cars run with much less than 80% and not smoke anything close to this so I’m not sure if this is the problem or a symptom of the problem.
I assume that there was some catastrophic failure of some part which is causing the oil circulating system to become highly pressurized during normal operation. Because previously the car never burned oil or had smoky exhaust, until one day when it was really cold out. If it was the rings or a blown piston I would think it would show more of a leak in the pressure test. It seems to smoke worse once it’s warmed up. It’s winter here and it doesn’t really begin to smoke until the car is warm, then watch out. Smokes like a James Bond car…
Is it possible I have a bad head gasket, between the oil holes and one or more of the cylinders? Or is it more likely a piston or ring?
Any ideas before I pull the head?
Thank you very much…