Mrl390--it should have been under your air filter, attached to a hose that went to the oil filler cap.

Both the trucks in my sig have one--one's a 302, the other's a 351--definitely not just a 460 thing.

Jason

 

I just opened my 92 5.0 air box and looked last night...standing next to the driver side fender, looking down into the box.....mine is in the lower right .almost to the corner. The big hose from the driver side valve cover connects to it on the outside. All the filtering material is gone from mine....just a frame left. It's held in the box by a U-clip on the outside.
New one today.

I think everyone with a stock air box has one.

 

here is where it is located. fairly stiff hose coming out of the rear/bottom of the airbox.


close-up


here's where it ends, on the side of the 710 neck.

 

Not everybody will have one of these. I've got a 94 bronco 302 and it does NOT have one. Not sure why.

 

The previous owner of my truck stripped some out too. Rather than replace the airbox I found some autobody nuts with the same thread and a rubber cushion on them. The rubber holds them in place so they don't spin while you tighten, and gives some anti-vibe benefits to prevent loosening. Not the best fix, but it works.

 

I fixed the nuts today... I removed the air box from the truck so I could do the work.

I found some shouldered hex nuts that fit the bolts properly and heated them up with a torch. I melted them into the old holes from the underside of the air box (hex side first) until the shoulder seated against the plastic of the box. The a bit of cold water and they were set.

I only did two of them as the other two were still OK, but now I can tighten the airbox bolts properly - which I was not able to do before.

Then, just to try to get back on the thread topic, I noticed, while I had the airbox opened up, that the breather filter that I just changed two weeks ago had a fair amount of oil in it... This makes me think I'm getting a lot of blow-by. Short of dismatling the engine and putting in new rings and valve seals, any fixes for this?

My engine has 134K miles on it. When does a 460 normally need to be rebuilt?

 

I have used epoxy on the nuts.

Make sure you replace your PCV valve when servicing the PCV system filter etc. Just because it rattles does not mean it is any good. Replace the PCV annually. A bad PCV will slime the filters up rapidly.

 

stupid question: where/what is the pcv and what does it do? i guess i should replace mine

 

I replaced my PCV valve when I replaced the breather filter.

The PCV Valve is on the passenger side valve cover and has a Vacuum hose connected to it that runs to the back of the intake manifold.

What it does: PCV (Positive Crankcase Ventilation) system is designed to suck the engine blowby (fine oil mist) into the intake so it can be burned durring combustion. The valve is supposed to allow the engine vacuum to suck in the mist, only when there is enough pressure to do so. The act of applying this vacuum to the crankcase causes, in theory, might actually cause to much blow-by to take place by potentially creating too much vacuum in the crankcase. This is why the breather is added to the system. The breather is supposed to let filtered air into the crankcase, so the PCV Valve can suck it back out again.

Long winded answer to say that it is designed to prevent the crankcase from becoming pressurized, which could cause the gaskets or seals to blow.

 

I definately didnt have that little filter. I would have remembered it since I had the filter out on several occasions. My box doesnt have a place for that filter anyway. It has a hole in the side of the bottom of the box that the breather goes into and the end of the breather was held on by a clip similar to the kind that holds your door locks in. No place for a filter. And yes it was the factory air box. Doesnt matter anymore since I took out the air box.