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You are here: Experts > Home/Garden > Auto Repair > Triumph Repair > TR4A PCV
Expert: Howard M. Fitzcharles III - 8/30/2008
Question
Hi Howard,
1966 TR4A which I have owned for 8 years. Never had oil leak problems until this summer. Then I got leaks from every where. I am pretty sure I traced it back to a clogged PCV causing crankcase pressurization. I opened the PCV up and cleaned it but, now I an not so sure the spring and diaphragm inside were assembled correctly. Do you know and can you explain it? I checked several manuals but cannot find a diagram of this part.
Mine had the spring first in the bottom of the valve. Then the little metal disk with the pin sat on top of the spring with the pin pointing down (towards the vent hole in the bottom of the valve). Then the rubber diaphragm on top, then the metal lid. My main question, is the metal disk with the pin supposed to be attached/glued to the rubber diaphragm to keep it properly positioned? Mine was not so the metal disk was able to float around inside the valve.
Thanks
Bob
Answer
Hi Bob,
You are correct as far as the components in order as I remember them. The metal disk that had the pin attached was held in line by several spines that were part of the case. The rubber diaphragm was just a rubber disk and was not attached to the metal disk with the pin attached. The spines of the case kept the pin in line. Be sure the small hole in the metal cover disk is open so that the diaphragm can be forced down when manifold vacuum pulls the diaphragm down.
The same PCV was used on early MGBs too and we use to clean them on certain mileage inspections. If you have cleaned it and the ports and you still have oil leaks, you may have excess crankcase pressure which comes from ring leakage. You should run a compression leak down test and / or do a dry and wet compression test. This checks for ring leakage. A PCV valve can only handle a small amount of ring leakage.
Howard
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