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On 21 Jan 2005 at 0:59, Constantino Tobio wrote:
> Some later automatics had an AAR that was electrically heated, rather
> than rely on engine temp to close the AAR. This AAR mounts in about
> the same place as the engine temp operated AAR. I think this is only
> 50 state '73s with autos ('72 autos in california)
All FI AT type 3s from '70-on got the electrically heated AAR. Like the oil
temp regulated AAR, this one also has nothing to do with crankcase ventilation.
> The crankcase breather system (well, at least in the case of my '73)
> draws air in to the crankcase through the black breather box on the
> top of the fan shroud (where on a Type 1 the generator stand would be)
> and air is pulled out via the cylinder hears back into the air
> cleaner, to be burned in the intake. There is no PCV valve per-se in
> this system as far as I can tell, but there is a state of positive
> pressure in the crankcase that causes hydrocarbon vapors to be
> reburned in the intake.
On all type 3s the crankcase vapors EXIT thru the breather box, which is
mounted on the top of the case, not the fan housing.
Up thru '67 these vapors exited below, via a "draft tube" and a rubber valve.