Posted by JimG
on 8/26/2008, 7:39 am, in reply to "Crankcase Ventilation Problem"
70.110.123.86
Bob:
I don't have an answer to your question, but I have a question for you: did you use the same carb, or did you change the carb to a later one that was designed for use with a PCV? The reason I ask - the PCV is really a "controlled vacuum leak", and I always assumed that if you added a PCV and tried to run it with a non-PCV carb, it would run lean.
I was contemplating doing the same thing you did. Maybe you can fill me in on that detail.
Thanks,
Jim
--Previous Message--
: I have a 1962 Falcon station wagon
: with the 170 motor. It has about
: 134,000 miles on it. It has a draft
: tube to ventilate the crankcase.
: When the engine is idling, the fumes
: from the crankcase vapors drift out
: from under the car and are picked up
: by the heater in the cooler weather.
: When it is parked in the garage, the
: convection flow of air up through
: the draft tube and out the oil
: filler cap fills the garage with
: noxious gas odors. In an attempt to
: eliminate both of these problems, I
: decided to install a PCV valve. I
: purchased a valve cover with a PCV
: hole from Auto Krafters and
: installed it this weekend. I
: purchased a Mr. Gasket oil filler
: cap with a foam filter insert, and a
: new PCV valve from Carquest. I
: attached a 3/8 inch hose to the PCV
: valve and connected it to manifold
: vacuum through the aluminum adapter
: under the carburetor. I also plugged
: the draft tube to prevent outside
: air from flowing into it. With the
: engine idling, there is a slight
: vacuum at the oil filler cap and no
: vapors escape. However, if I put the
: car in Drive with the emergency
: brake set and then briefly rev the
: motor, crankcase vapors begin to
: flow out from the oil filler cap, so
: the PCV valve apparently cannot pass
: enough of the vapors to keep them
: from escaping. Looks like there is a
: lot of blow-by from the piston
: rings. I thought that I might be
: able to use a PCV valve from a 200
: or 240 cube engine, thinking that
: they might pass more vapor. However,
: the parts catalogs indicate that all
: of the six cylinder motors use the
: same PCV valve. Short of an
: overhaul, is there any way that I
: can solve this problem? Thanks for
: any and all ideas.
:
: Bob
:
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