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  #1  
Old 08-10-2008, 11:14 PM
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tires keep losing air

My darling wife's Jeep Grand Cherokee has a peculiar problem...the tires all keep losing what I consider more-than-normal air pressure. It has factory 17 inch alloys with Kumho KR21 touring tires with maybe 5000 miles on them. All of them will lose 7-10 PSI per month, the right rear has something else going on and will get down to 20 PSI within 7-10 days, guess I should have that one looked at.

Why am I losing so much air? I lose a smidge in my other cars, but not nearly this much. What should I look for with the leak in the right rear? There are no punctures, I think there's something funny with the bead.

What is a normal pressure loss, over, say a 30 day period?
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  #2  
Old 08-10-2008, 11:24 PM
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Normal loss is around 1 psi per month. I've had tires that lost less than that. I think your tires are due for a dip in a tank of soapy water to see where they're leaking.
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  #3  
Old 08-10-2008, 11:45 PM
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Probably leaking from a corroded bead area. The tires will have to be dismounted and the white chalky corrosion removed. May even have to apply some glue especially made for this issue. Then you'll have to have them rebalanced.

You can check this yourself. Pull a wheel off, lay it flat on the ground, and pour some soapy water around the rim. Let it alls ettle down, and then look for small bubbles around the rim.
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  #4  
Old 08-10-2008, 11:54 PM
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Google: tire valve recall
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  #5  
Old 08-11-2008, 01:58 AM
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corrosion around bead area is common on older chrome wheels.
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  #6  
Old 08-11-2008, 05:52 AM
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If the wheels are aluminum, occasionally you will have leaks through porous castings. All four wheels doing it seems unlikely though.

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  #7  
Old 08-11-2008, 09:51 AM
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If this problem did not exist with the previous tires, I'd look at the Kumhos. Wonder if through a manufacturing defect, the bead is a touch too large in diameter. If this is the case, the tire should be walking around on the rim a bit.
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  #8  
Old 08-11-2008, 10:05 AM
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Just to complicate things, the Jeep started out with a 16 inch wheel package, I bought these wheels off Craigslist with worn-out Michelins on them, drove them for a month or 2 before I put the Kumho's on there, so I really can't say if the wheels are the likely culprit, or the tires. I will say that the touring tires are not a good match on this vehicle: the sidewalls are too soft. I specifically went to 17s because the tall skinny Goodyear Wrangler ST's on the 16s were so mushy it wasn't even funny. I went from a 225.75r16 to a 235.65r17, so even with a relatively soft sidewall, the Kumho's are better than the Goodyears, but the firmer Michelins worked better.

I really had an issue with the Goodyears...I watched the tech try to inflate one of them on the wheel, and the sidewall was so soft and floppy that 2 techs had to hold it up to get enough air volume inside to make it inflate against the bead. If there is such a thing, they seemed flimsy. They were the factory fitment, but wore poorly and I got punctures in 3 of the 4 somehow. I replaced the factory GY's with one more set of identical tires before I gave up.
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  #9  
Old 08-11-2008, 10:42 AM
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I got a letter from discount tire about faulty valve stems, as I haev been losing air also. If you got them mounted at Discount, take it back and they will replace free of charge.
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  #10  
Old 08-11-2008, 11:28 AM
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I got them mounted for free at the MB dealership where I used to work, palmed one of the older tech's a $20 to do it, so I don't have a whole lot of recourse on this one.
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  #11  
Old 08-11-2008, 11:31 AM
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Quote:
Originally Posted by E150GT View Post
I got a letter from discount tire about faulty valve stems, as I haev been losing air also. If you got them mounted at Discount, take it back and they will replace free of charge.
Ditto. I got the same letter last week...but for the vehicle that got tires two years ago! Nothing for the W124, which got a set a couple of months ago from same dealer. Go figure!
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  #12  
Old 08-11-2008, 11:40 AM
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Quote:
Originally Posted by G-Benz View Post
Ditto. I got the same letter last week...but for the vehicle that got tires two years ago! Nothing for the W124, which got a set a couple of months ago from same dealer. Go figure!
Maybe they're going through their database by invoice number. You'll get the notice for your other car in a week or two.
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  #13  
Old 08-11-2008, 11:45 AM
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You might try a product called Green Slime. I used it on one of my tires with a persistent slow, slow leak and it worked fine. Never had a problem and did not mess up the balance.
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  #14  
Old 08-11-2008, 11:48 AM
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Quote:
Originally Posted by tyl604 View Post
You might try a product called Green Slime. I used it on one of my tires with a persistent slow, slow leak and it worked fine. Never had a problem and did not mess up the balance.
I used that on my yard tractor. It worked great.

Just make sure you let the guy who changes your tires next time know so he can be prepared.
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  #15  
Old 08-11-2008, 12:03 PM
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I think you should have them remounted and checked, all four.
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