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Topic: Tire Pressure Leak Down (Read 807 times) previous topic - next topic

Tire Pressure Leak Down

One of my rear tires leaked down 3 psi (95 to 92) over 72 hours. Is that too much? Should I have it pulled off and checked? or just keep and eye on it? I would not think there would be a nail puncture.
Will tire sealant work on truck tires for small leaks?
thanks,
Rick
Rick & Deborah Webster
2002 3610 U320 #5964
2014 Jeep Wrangler Sahara JKU- 'Copperhead'
Richland Chambers Lake, East Texas

Re: Tire Pressure Leak Down

Reply #1 –
If it was from hot to cold temps, that would not be an issue. If you checked them at the same temps it needs to be repaired. It is sometimes just the valve core leaking check that.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Tire Pressure Leak Down

Reply #2 –
Will the bead hold if I change the valve core?
Rick & Deborah Webster
2002 3610 U320 #5964
2014 Jeep Wrangler Sahara JKU- 'Copperhead'
Richland Chambers Lake, East Texas

Re: Tire Pressure Leak Down

Reply #3 –
Quote from: Old Hippie –
Will the bead hold if I change the valve core?


Usually just need to tighten it, not remove it.

Tool looks like this: Tire Valve Core Tool - Walmart.com 

Should be able to find one at any auto parts store.

Also a high quality metal valve cap can prevent leak down.
Dan - Full timing since 2009
2003 U320 40' Tag 2 slide

Re: Tire Pressure Leak Down

Reply #4 –
Quote from: Old Hippie –
Will the bead hold if I change the valve core?
You can change the valve core without losing the bead as it takes more time to leak down than switching the cores. As posted above maybe just loose and needing tightening.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Tire Pressure Leak Down

Reply #5 –
Possible valve core damage from poor tire gauge or just old and leaking. Check for air leak with a little soapy water on the stem. You will be able to see bubbles. If leaking, you can use the tool to tighten or remove the core and replace with a new one before it leaks even five pounds.

I would check for a nail if above does not fix it. Drive a foot or so and inspect. Mark tire and repeat until you have checked the entire circumference.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: Tire Pressure Leak Down

Reply #6 –
3 PSI could be explained by a temperature drop.  That would not be enough that I would do more than a "soap bubble test" of the valve core and where the valve stem meets the rim and do a quick inspection for a nail in the tire.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Tire Pressure Leak Down

Reply #7 –
Thanks all, I did tighten the valve almost a 1/4 turn, forgot to bubble test it first though, duh.....Will do a visual tomorrow
Rick & Deborah Webster
2002 3610 U320 #5964
2014 Jeep Wrangler Sahara JKU- 'Copperhead'
Richland Chambers Lake, East Texas

Re: Tire Pressure Leak Down

Reply #8 –
 Of course, temp change will affect all of the tires, until the sun hits some of them.

Re: Tire Pressure Leak Down

Reply #9 –
In West TX, sitting in our driveway, I regularly see 10+ PSI difference in tire pressure between the sunny and the shaded side of the coach.

Also the inner tire and outer tire pressures on the rear duals can vary quite a bit on the sunny side.

Best time to check tire pressure is early in the morning before the sun hits any of the tires.  Set them when they are cool, and then don't "sweat" the temp-induced pressure changes the rest of the day.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"
 

Re: Tire Pressure Leak Down

Reply #10 –
I check my tire temps every time I take a break when travelling. Have found tire temps sometimes 20 f warmer on sunny side of coach.
Jim C.
coachfree, previous 1997, 1999, 2000, and 2003 Foretravels.