Posted by Bob
on 8/29/2008, 10:45 am, in reply to "Re: Crankcase Ventilation Problem"
74.74.77.70
You make a good point. I revved the motor slightly to simulate the effect of putting the motor under load and causing more blowby. I forgot about the vacuum drop.
Still, I think that there's a problem because I can smell gasoline vapors when I'm driving, but when I come to a stop light and sit there for a moment, the smell goes away. I'm assuming that excessive blowby is coming out of the oil filler cap when driving, but the lower amount of blowby when idling is being drawn into the intake manifold. The choke is operating normally, and the mixture seems to be okay because I get good mileage.
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: --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
:
: why would you put it in drive to
: rev.the motor?when you rev.the motor
: your vacume drops of
: considerablly,and the added pressure
: in the crankcase will force it out
: anywhere.when you smelt gas before
: maybe check your choke set up,or you
: are running way to rich.
:
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