[TR] TR3 Engine Vent

[GHaynesTR4 at aol.com]

Paul,
Neither the TR3 nor TR4 engines had a closed crankcase in the US, instead 
having the vent pipe at the rear of the block on the driver's side and a vented 
valve cover (oil filler) cap. The shape and location of the vent pipe caused 
some vacuum when the car is moving, so crankcase fumes are sucked out of the 
crankcase.
Starting with the TR4A, Triumph used a closed crankcase system, including a 
flat PCV valve between the valve cover and intake manifold, plus a sealed 
(non-vented) oil filler cap on the valve cover, plus a felt gasket on the dipstick. 
  All these pieces must be in place for the system to perform correctly, and 
they don't affect the engine's operation adversely.
If you don't want to dump fumes into the environment, get a TR4A valve cover 
and sealed cap, plus the PCV valve and hoses, and a felt washer for the 
dipstick.   All this should be available from Moss, OK, maybe not the valve cover.   
I have this setup on my 1965 TR4A and have no problem with it.
Good luck!
George Haynes


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