Message text written by "Bill Brewer"
> I am getting ready to fire up my newly rebuilt engine in my TR3A.
After
the engine is run in, I plan to go to synthetic oil. I am looking at the
crankcase breather pipe and it looks like a place that would let
contaminants into the system. The TR4 had positive crankcase ventilation
(might have been a TR4A). Is there any reason why you wouldn't want to put
a
plug in the TR3 crankcase breather pipe and put on a later valve cover with
a tube connecting the valve cover to the air cleaner to keep positive
ventilation on the crankcase? It seems like it would possibly help prevent
oil leaks as well. What could go wrong? The factory did it eventually on
other Triumphs. Has anyone else done this?
<
That tube doesn't let contaminants in, it sucks them out. When the car is
in motion the air moving past the end of the tube develops a mild
depression (a slight vacuum) which draws air out of the crankcase which is
replaced by clean air passing through the filler cap (which has a screen to
stop particles). One downside is it doesn't work when the car is stopped
and there may be a bit of smoke or oil fumes but blowby will keep unwanted
contaminants out until the car starts to move again. Another downside is
the air being extracted will contain small amounts of atomized oil which
will deposit itself on the underside of the car (the infamous anti-rust
feature so oft discussed) which some might find objectionable. But not us,
right?
Dave
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