TPMS threads worn on 'new' ML320
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Joined: Jan 2008
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ML320
TPMS threads worn on 'new' ML320
I recently had studded snow tires installed at a non-MB shop. OEM 19 inch wheels were replaced with 255/50/18's and after-market wheels as tire dealer couldn't find a 19" studded winter tire.
The TPMS sensors are two-part; metal stem and sensor. Installer showed me one stem that had outside threads worn smooth and advised that none of the stem-sensor combinations would hold air as the 'rubber' gaskets were brittle.
I have 8k miles on the rig so took sensors to MB dealer. They advised the units had been damaged by the installer - no warrantee coverage.
Anyone else encounter this problem (worn threads)/have any idea how that might occur? I've seen a stem support that installs to support the stem against the rim - about US$5 each, but the part description suggests its for supporting stem while driving at very high speeds.
Can I order after-market stem and sensors without ordering wheels and tires?
Thanks
The TPMS sensors are two-part; metal stem and sensor. Installer showed me one stem that had outside threads worn smooth and advised that none of the stem-sensor combinations would hold air as the 'rubber' gaskets were brittle.
I have 8k miles on the rig so took sensors to MB dealer. They advised the units had been damaged by the installer - no warrantee coverage.
Anyone else encounter this problem (worn threads)/have any idea how that might occur? I've seen a stem support that installs to support the stem against the rim - about US$5 each, but the part description suggests its for supporting stem while driving at very high speeds.
Can I order after-market stem and sensors without ordering wheels and tires?
Thanks
Last edited by oreddie; Jan 4, 2008 at 01:43 PM.
TR Moderator & Tire God
Joined: Nov 2001
Posts: 3,545
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From: SouthBend, IN USA
depends on the weather
I have seen it dozens of times ... the nut for the valve stem has a torque spec of 35 inch pounds are a 1 time use part so, many shops end up stripping them out
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ML320
Thanks for the speedy reply. So improper removal could well be the cause.
Would that explain why the threads were smooth (gone) only within a narrow (about 1/8 inch) area perpendicular to the threads? To my non-mechanical eye, it looks like it was rubbing on something for awhile.
I'm not looking to blame anyone - just wondering if, when the new ones are installed, I might have something going on that might damage them as well.
Would that explain why the threads were smooth (gone) only within a narrow (about 1/8 inch) area perpendicular to the threads? To my non-mechanical eye, it looks like it was rubbing on something for awhile.
I'm not looking to blame anyone - just wondering if, when the new ones are installed, I might have something going on that might damage them as well.
