AUM

A few days ago I posted asking a question about a strange vacuum hose routing my Mazda dealership did for me. After doing many searches, looking over many different vacuum hose diagrams, and through the repair and parts manuals countless times I cannot figure this out.

After removing the intake elbow I was able to see that the hose in question is coming from part of the engine where the plastic oil filler pipe connects to the engine. The oil dipstick also comes from this part of the engine where the hose is coming from. This hose and where it starts is in the first picture (circled), you can see the oil filler pipe to the left of the picture.

Mazda ran the hose from here back to the firewall and then along it to the driver’s side. They placed a valve on the end of the hose and secured it in place with a zip tie. The valve on the hose has the following information on it; [B]61K VAC D5HE-AA DIST. The second image shows what Mazda did with the end of the hose.

So where is this hose really suppose to go, and is this valve even suppose to be on it? To me it looks like Mazda had no clue.

Also my car is an automatic if that matters at all.

Thanks

BigIslandSevens

iTrader: (4)

is it coming from the purge control solenoid?Hard to see in there.

AUM

The vacuum hose is coming out of the circled piece in the picture. This is what the plastic oil filler neck connects to. The hose comes out of this piece on the fire wall side (the oil filter side).

I need to know what hose this is and where it goes to.

AUM

The hose that I am confused about is the one that is connected to the nipple (circled in the picture) on the intermediate housing.

Where does the other end of this hose go to and should there be a check valve on it like the one in the above picture?

I just can't seem to find any info on this.

BigIslandSevens

iTrader: (4)

Welll... I don't know! My intermediate housing does not have that nipple. Mine is a manual 94'R2. My Factory Service manual does not show it either. Now i'm very interested!!! Anyone with an automatic chime in on this?!! Or with a manual if you know!!

AUM

I think I might have just figured it out after hours of searching. From what I understand is that the reason why my reman engine's intermediate housing has this nipple is that it is an early 93 intermediate housing. I hear that you can just cap it off with no worries, is this true. Or should I keep Mazda's hose contraption with the check valve on the end of it.

tester1977

I was just looking at a vacum hose diagram for my own reasons when I saw this vacum hose coming off of the oil filler neck and I remembered this post. The diagram shows the hose connecting to a pcv valve and then connects to the UIM near where the elbow connects on the front side.

Here is a link to the diagram. I hope this helps you out.

http://www.scuderiaciriani.com/rx7/v...placement.html

duboisr

Garfinkle said that is a houseing with a vent nipple from a second gen . And they can plug it up or put a filter on it or one way valve . There is no problem building an engine that way as long as they used the correct rotors for a turbo engine .

RX7 8U

iTrader: (1)

My 81 RX7 had this. It ran to the air cleaner so it could suck up blow-by in the oil pan area. I think what your dealer did was not smog legal (if that matters where you live). If there is a line connected to the passenger side of the oil filler neck you should tee the dealer installed line to this line. This line goes to the intake to vent the crankcase (or whatever they call the oil pan area in a rotary)........or just plug like dubios said.

BigIslandSevens

iTrader: (4)

This is what I was starting to think. I went and looked at our second gen and it had it. I agree as long as the correct turbo parts were used , no problem.

AUM

So my intermediate housing is from a second gen engine and as long as the correct rotors for a third gen turbo engine are used there should be no problem.

So how do I tell if the correct rotors are used? Is it physically possible for mazda to have installed a second gen engine into my car without knowing? Will all the FD pieces such as the turbos, manifoild and such fit onto a second gen engine? In other words is there a physical difference between the two?