Pop-Off Valve Popped OFF!!!

pnzr911 · 06-27-2002, 09:52 AM

This morning on the way to work, I heard a small backfire in my airbox. Suddenly my car died. I pulled over and pulled off the aircleaner and low and behold my pop-off valve was just sitting there. I put it back in and the car started and got me to work. I used jb-quick weld to glue the valve in. Can anyone give me a brand name of an expoxy that works? JB quickweld sucks!!

Help!!!!

Chuck Moreland · 06-27-2002, 10:51 AM

I used JB Weld and the same exact thing happened after about 6 mos.

I glued it back in with regular old 5 minute epoxy. So far so good but it has only been a few months.

Paul Valcourt · 06-27-2002, 11:29 AM

I would use quick cure urethane, available from windshield places. A tube costs $8-10 and will be more than you will need but the stuff sticks to everything. You will need a standard caulking gun to dispense it. Make sure both surfaces are clean, put a bead on one of the mating surfaces put together and have something to hold it in place while curing. It should be good to go after sitting overnight. This is very messy stuff if you get it on other surfaces but cleans up with automotive gun wash.

Kurt B · 06-27-2002, 11:41 AM

What you need is plastic welding stuff. This stuff is STRONG and it dries super quickly.
It is not called epoxy, it is called plastic weld, and you can find it at an autoparts or hardware place.
It should be light yellow and clear colors.
Stinks when you mix them. You use that stuff, and that thing will not be removable. And I used JB too on plastic/metal adhesion and it didn't work at all (not designed for it so it's no surprise)

Sunroof · 06-27-2002, 12:23 PM

SAme thing happened to me and it sounded like a grenade went off in the back seat. I thought it shattered the box to pieces but the pop off valve blew clean off. I got a ride to ACE Hardware and found a quick 15 second two part epoxy that they said would hold an elephant to the ceiling!

Talk about emergency repairs!! If it were'nt for the stir stick and Burger King coffee cup to mix it in I would have paid a hefty tow bill.....

All is just fine and dandy now.....I wished I remembered the brand name of the epoxy but anyone of these urethane two part quick dry, 5 buck packages will cure it.

Regards
Bob
73.5T

Wayne 962 · Wayne 962's Garage

Make sure that the bonding surface is completely clear of oil and gas - otherwise the epoxy won't stick...

-Wayne

Bill Douglas · 06-27-2002, 03:04 PM

And deglaze the plastic in the areas that will have expoy sticking to it. Some sand paper will do the trick but don't leave any sandpaper grit in the airbox. Mainly sand the base of the pop off valve.

Superman · 06-27-2002, 03:07 PM

The mating surfaces of those popoff valves are so slick they feel greasy. Mine blew out, too. So I sanded the mating surface, reglued and it's been fine ever since. 2-part, high temp epoxy.

pnzr911 · 06-27-2002, 09:03 PM

Wow! I thought I was the only one going thru this! I did notice that the pop-off valve is very slick so I will sand it and get a rough texture. So far no one has mentioned a brand name.

I wonder what the shops use? JOHN WALKER you out there???

pkfrdh · pkfrdh's Garage

pnzr911,

The brand name of a good plastic epoxy welder is DEVCON. It definately makes a big difference if you rough up all the mating sirfaces. This stuff works even on the kind of rubber plastic that sunglasses are made of. You only have about two minutes of working time depending on the temperature. Have everything ready to go and mix the amount needed to cover both surfaces and have extra applied to create a bead that will increase the surface area. Don't skimp with it.

Good luck...it should hold after this.

The urethane sounds good too...very strong and still flexible. Gorilla Glue is one brand in small containers. This stuff reacts with moisture in the air and once you open up a container, it tends to all harden no matter what you do. Buy the smallest container. Sold at most hardware stores. Not sure about fuel resistance.

JGL

pnzr911 · 06-28-2002, 08:44 AM

Thanks guys! I will check out the local hardware store on the way home today ( I leave at 11:00 woot!) and look for gorilla snot or Devcon epoxy. Just hope I don't backfire again ( I didn't this morning!) Thanks again!!!

pkfrdh · pkfrdh's Garage

pnzr911,

Usually, the 3.0 l will backfire more often upon startup when it is a little lean. You may want to try to check the richness adjustment. Smog passing adjustments make the car run lean. A greater chance for more frequent backfires.

JGL