Page 1 of 2 1 2 LastLast
Results 1 to 10 of 13

Thread: Weird tire pressure issue

  1. #1
    Corporal Hmmv4me's Avatar
    Join Date
    Mar 2019
    Location
    Carson City, NV
    Posts
    36
    Thanks
    12
    Thanked 3 Times in 1 Post

    Default Weird tire pressure issue

    I have a weird issue with my 12 bolt wheel. The tire is aired up and looks good, however, when I check the tire pressure, I get 0 pressure. If I try to add air, if goes from 0 to 40psi in less than a second and when I let the air back out it goes to 0 in the same amount of time. I removed the valve stem to to see if it was clogged, stuck a 2.5" nail in the stem and it hit something hard like rubber. Could the run flat be sitting wrong or something? Is it safe to split the wheel with pressure in the tire?

  2. #2
    Sergeant Major
    Join Date
    Mar 2019
    Location
    Olympia/WA
    Posts
    134
    Thanks
    134
    Thanked 95 Times in 55 Posts

    Default

    NO!!!!!

    Do NOT split the rim with any pressure in the tire.



    Very bad juju

  3. The Following 5 Users Say Thank You to Coug For This Useful Post:

    98G (06-11-2019), NormB (06-09-2019), papakb (07-14-2019), TOBASH (06-10-2019), waayfast (07-14-2019)

  4. #3
    Sergeant Major
    Join Date
    Mar 2019
    Location
    Olympia/WA
    Posts
    134
    Thanks
    134
    Thanked 95 Times in 55 Posts

    Default

    I'm not present at the tire to see exactly what is going on, but definitely sounds like something blocking the stem. If there is no way to push the blockage out of the way, maybe tapping the nail with a hammer gently or something, I think that personally, and I'm not advocating this for anyone else without actually being present, I would use a small drill bit and try to make enough of a hole in the blockage to allow the air to leak out overnight or whatnot.

    I can't think of any safe way to remove the tire while under any type of pressure.

  5. The Following User Says Thank You to Coug For This Useful Post:

    NormB (06-09-2019)

  6. #4
    Corporal Hmmv4me's Avatar
    Join Date
    Mar 2019
    Location
    Carson City, NV
    Posts
    36
    Thanks
    12
    Thanked 3 Times in 1 Post

    Default

    Yea, I didn't think splitting the rim was smart, I'll try tapping the nail lightly a bit. If that don't work, I'll give the drill a shot.

    Thanks Coug

  7. #5
    4 Star General 86humv's Avatar
    Join Date
    Jul 2007
    Location
    High Desert ca and Texas
    Posts
    1,137
    Thanks
    4
    Thanked 316 Times in 221 Posts

    Default

    Safety glasses.
    86 hmmwv
    M1102
    M101A2
    Lots a hmmwv parts

  8. The Following 4 Users Say Thank You to 86humv For This Useful Post:

    98G (06-11-2019), NormB (06-10-2019), TOBASH (06-10-2019), waayfast (07-14-2019)

  9. #6
    3 Star General
    Join Date
    May 2016
    Location
    Alexandria VA
    Posts
    851
    Thanks
    22
    Thanked 601 Times in 343 Posts

    Default

    Quote Originally Posted by Hmmv4me View Post
    Yea, I didn't think splitting the rim was smart, I'll try tapping the nail lightly a bit. If that don't work, I'll give the drill a shot.

    Thanks Coug
    +1 for full Personal Protective Equipment while working on this. Note that the nail (or whatever) once you get the foreign object out of the way, will be exposed to that full tire pressure, and will become a bullet if you don't have something heavy very firmly clamped to that nail. I think I'd use a long thin rod instead, like some of that light steel used on cheap plastic signage on the side of the road by shopping centers, and I'd clamp it in some large vise grips.

    Bulldogger

  10. The Following 2 Users Say Thank You to Bulldogger For This Useful Post:

    Coug (06-10-2019), NormB (06-10-2019)

  11. #7
    General DatGuyC's Avatar
    Join Date
    Feb 2012
    Location
    Essex, Maryland
    Posts
    536
    Thanks
    6
    Thanked 182 Times in 118 Posts

    Default

    What type of run flats are you using? The one piece rubber ones have notches in the rim where the valve stem should sit so its not blocked by the rim of the runflat.
    1993 M998

  12. #8
    Corporal Hmmv4me's Avatar
    Join Date
    Mar 2019
    Location
    Carson City, NV
    Posts
    36
    Thanks
    12
    Thanked 3 Times in 1 Post

    Default

    I'm not sure, I haven't taken one apart yet, all I know at this point is is it is a 12 bolt rim on a 90 M998 with radials.

  13. #9
    Former SSG 98G's Avatar
    Join Date
    Aug 2013
    Location
    AZ/KS/MO/OK, varies by the day...
    Posts
    4,259
    Thanks
    6,483
    Thanked 3,483 Times in 1,617 Posts

    Default

    Quote Originally Posted by Bulldogger View Post
    +1 for full Personal Protective Equipment while working on this. Note that the nail (or whatever) once you get the foreign object out of the way, will be exposed to that full tire pressure, and will become a bullet

    Bulldogger
    Nah.... it is exposed to the pressure in direct proportion to the surface area involved. Nail head has maybe 1/25 of a square inch of surface area. At 50psi it is exposed to 2lbs of force. Dangerous to eyes? Absolutely. But in the scheme of things it doesn't compare to a decent pellet gun.

    On the other hand, consider what would happen if you split a 2 piece rim while inflated to 50psi. Rough estimate of surface area gives us 3300 square inches at 50 pounds per inch. That yields 165,000lbs of force. A bomb by anyone's standards.

    Edit to add another point of comparison. To launch a lowly .22 caliber bullet, roughly 20,000 psi is the operating pressure.

    Anyway, I hope someone found the numbers entertaining.
    Last edited by 98G; 06-11-2019 at 23:12.

  14. The Following 3 Users Say Thank You to 98G For This Useful Post:

    Coug (06-11-2019), tennmogger (06-12-2019), Wire Fox (06-12-2019)

  15. #10
    Corporal Hmmv4me's Avatar
    Join Date
    Mar 2019
    Location
    Carson City, NV
    Posts
    36
    Thanks
    12
    Thanked 3 Times in 1 Post

    Default

    Problem solved. Some genius installed the run flat backwards. I removed the valve stem and left the tire on the truck for a couple weeks. Most of the air leaked out. I placed the rim under the jack of my trailer and loosened the nuts 1 turn at a time going around the wheel until i heard a psssss. The remaining air leaked out. The notched side of the run flat was on the wrong side... easy fix. Just flipped the rim, retorqued and inflated.
    .
    Attached Images Attached Images
    Last edited by Hmmv4me; 07-14-2019 at 00:26.

  16. The Following 3 Users Say Thank You to Hmmv4me For This Useful Post:

    98G (07-14-2019), CMPPhil (07-14-2019), Coug (07-14-2019)

Page 1 of 2 1 2 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •