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Q & A: PCV System

Hi John and cheers from Canada.

I don't have a local MG specialist close to me and hope you can answer a question. On my 74 1/2 MGB the crankcase breather pipe that normally goes to the carbs (HIF) has been disconnected and vented to the air, presumably to keep oil etc. out of the carbs. However the breather pipe that connects the carbs is now open to the air and is sucking air (ie. the crankcase hose has simply been disconnected from the Y fitting.) The car seems to be running OK. Should the open connection connecting the carbs be closed up. I could simply reconnect the crankcase hose but could oil be a problem? Or could I leave the crankcase hose as it is and block the opening in the connection between the carbs? Or just leave things as they are? I am wondering if any of this is a potential problem. The plugs look OK (Does the breather hose enter the carbs on the air side or engine side of the butterfly valve. If the latter could this cause a problem with the valves or maybe this is compensated for by excessively rich adjustment at the carbs? Anyway hope you can enlighten me. Thanks and cheers.

Gord

Gord!

It is important to have the PCV system connect up correctly. This system keeps the inside of the engine clean of water vapors and harmful, acidic blowby.

The system is simple: Fresh air enters the black tu... read more