'89 YJ 4.2 Pulse air?

I don't recall any check valves in my pulse air system. I do remember -- very vividly -- the broken air manifold that leaked badly. But, I do not remember any valves.

As Bill's hyperlink shows, these are the check valves that I'm writing about. I was wondering how they disconnect from the tube going to the exhaust. I can see the clamp on the upper part, but the lower part looks a little funky. It looks like a 3/4" hex fitting on a 5/8" tube. What's the best attack on this end? Also, my parts guy says the the two check valves are the same part number, does that sound right?

Bill, thanks for the link.

Joe '89 YJ 4.2 O|||||||O

Bill, I cut and paste this from your link...

The checkvalves in the Pulse Air System prevent backflow of exhaust into the carburetor. If one should go bad (stick open) and allow this, exhaust and water will spit into the air cleaner and be sucked down the carburetor. This is not good. Note that these tubes enter on the inside (clean side) of the filter element. This condition will lead to rust in the tubes, as seen in this photo, and rusty or sooty stains inside the air cleaner (this one has been cleaned). DaimlerChrysler is very proud of its checkvalves, and a new one will set you back about $50.

I have the water, I have the rust, if the shoe fits.........

Thanks for your help.

Joe

the vales are the same, they unscrew (but you must hold the lower pipe section while doing it) and yes the brownish water look is from a bad valve that allowed condensation to purp back up into the housing.

Good luck trying to take them off!

I would recommend soaking them several times a day for at least a week in a good penetrating oil.

That rust you see can make the tubes paper thin and the odds are it will just collapse under torque.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

Are you thinking that the water in your air cleaner is coming from the pulse air system? I don't think the water could be coming from that particular source because the pulse air system injects cold air into the exhaust stream, and the intake track is not connected.

I just said the same thing as Bill, the pulse air is not responsible for the water in the air cleaner. I guess I just learned something new.

Be very careful working with that air tube manifold, it breaks very easily and costs lots o money. I was not able to find one for under $120, and it was used. The only new one that I found was about $175.

I eventually removed the air tubes entirely, 4 of 6 were broken, and plugged the holes with brass plugs from Homey D's.

Yes, the two valves are the same.

The nut is welded to the tube. A [large] pipe wrench on the outside of the= =20 valve will unscrew it, but the tube may well break if it's cruddy. Mine=20 both rusted through, and when I found out how much it was going to cost to= =20 replace them (yikes!) I removed them instead.

--=20

Dale Beckett