Loose Valve Stem
Thread Starter
Pro
Joined: Apr 2015
Posts: 529
Likes: 199
From: Clarksville Tennessee
Loose Valve Stem
In my over 50 years of shade tree mechanic work I'd never seen this one. When we got home this morning I had an email from OnStar telling me i had a low tire. I had not gotten a low pressure warning and I had checked the pressures on the DIC while we were out and they were fine. I went back out to run another errand and the DIC warned me of low pressure (the same reading as the email - 16 pounds).
I ran the errand in the wife's car and bought a plug kit while I was out. Once home, as I was removing the valve stem cap I noticed the nut holding the stem against the wheel was rotating as well. Hmmmm. I tightened it and checked the other three. Two were a little loose. I aired up the tire and checked it twice during the evening with no drop in pressure. Problem solved, but it is a little concerning. Maybe this should be a periodic preventive maintenance item for me from now on.
BTW, these are aftermarket GM p/n wheels, mounted and TPMS installed by my local dealer a year ago.
I ran the errand in the wife's car and bought a plug kit while I was out. Once home, as I was removing the valve stem cap I noticed the nut holding the stem against the wheel was rotating as well. Hmmmm. I tightened it and checked the other three. Two were a little loose. I aired up the tire and checked it twice during the evening with no drop in pressure. Problem solved, but it is a little concerning. Maybe this should be a periodic preventive maintenance item for me from now on.
BTW, these are aftermarket GM p/n wheels, mounted and TPMS installed by my local dealer a year ago.
Team Owner
Joined: Apr 2013
Posts: 26,228
Likes: 4,356
From: Chirper Island
Recently, I had a valve stem start losing about a 1/2 pound a week compared to the other three. This went on for a month or two before I bought a tool to tighten it. I tightened it about a half-turn, and leak solved.
I have no idea why it started to leak tens of thousands of miles after the last tire change.
Never had any car do this before.
eta: this was factory mounted TPM.
I have no idea why it started to leak tens of thousands of miles after the last tire change.
Never had any car do this before.eta: this was factory mounted TPM.
Last edited by owc6; Dec 13, 2017 at 10:32 PM.
Drifting
Joined: Mar 2016
Posts: 1,486
Likes: 109
This has come up before -- and I appreciate the reminder because I've been having a little bit of leakage from my right front tire and will check torque on the valve stems.
Here's a post with torque values from July 2016:
https://www.corvetteforum.com/forums...post1592666913
and it says:
From Label on Sensor.
9 +/- 2 Nm = 80 +/- 17 lb-in
plus has a picture of the entire valve/tire pressure sensor assembly.
Here's a post with torque values from July 2016:
https://www.corvetteforum.com/forums...post1592666913
and it says:
From Label on Sensor.
9 +/- 2 Nm = 80 +/- 17 lb-in
plus has a picture of the entire valve/tire pressure sensor assembly.
Thread Starter
Pro
Joined: Apr 2015
Posts: 529
Likes: 199
From: Clarksville Tennessee
Thread Starter
Pro
Joined: Apr 2015
Posts: 529
Likes: 199
From: Clarksville Tennessee
This has come up before -- and I appreciate the reminder because I've been having a little bit of leakage from my right front tire and will check torque on the valve stems.
Here's a post with torque values from July 2016:
https://www.corvetteforum.com/forums...post1592666913
and it says:
From Label on Sensor.
9 +/- 2 Nm = 80 +/- 17 lb-in
plus has a picture of the entire valve/tire pressure sensor assembly.
Here's a post with torque values from July 2016:
https://www.corvetteforum.com/forums...post1592666913
and it says:
From Label on Sensor.
9 +/- 2 Nm = 80 +/- 17 lb-in
plus has a picture of the entire valve/tire pressure sensor assembly.
