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NA valve cover vent hoses? Which one?

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#1
Sphinx

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Mazda parts catalog shows two part numbers for the 90, b61P-13-742A and b61P-13-742C.  No indication about vin cutoff numbers,etc.  The one that came off the car has a little restrictor in it.  The replacement didn't (I picked up the 742A version, not realizing that there were two different flavors).

 

Is the restrictor necessary?



#2
Walter Vetter

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PCV valve?
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#3
Sphinx

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PCV valve?

 

No, the one that goes from the chrome pipe to the driver's side of the valve cover.



#4
Bench Racer

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No, the one that goes from the chrome pipe to the driver's side of the valve cover.

Walked out and pinched same hose, doesn't seem to be anything except hose.


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#5
Steve Scheifler

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Hmmm..., I'm not aware of a restrictor/orifice either, but perhaps it was added to reduce the amount of oil getting through the tube?
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#6
Sphinx

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Hmmm..., I'm not aware of a restrictor/orifice either, but perhaps it was added to reduce the amount of oil getting through the tube?

 

Digging up an old thread because I finally solved it.  According to the parts schematic for a 1990, there's a little plastic orifice (with its own separate part number) that goes inside that tube.  It has a singular orientation, not sure what happens without it.  It's reusable in the event that you have to replace the rubber line, as I had to when the original one cracked.

 

I can't tell you how many times I've looked at this schematic and never saw the orifice until recently.  Eureka!


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