Loose Valve Stem
12-13-2017, 09:07 PM
#1
Pro
Thread Starter
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.
12-13-2017, 09:25 PM
#2
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; 12-13-2017 at 10:32 PM.
12-13-2017, 10:03 PM
#3
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Well, here ya go. "...mounted and TPMS installed by my local dealer a year ago."
Not to say that it couldn't, but I've never had such with factory installed.
Not to say that it couldn't, but I've never had such with factory installed.
12-13-2017, 10:07 PM
#4
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.
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Mike1320 (12-13-2017)
12-13-2017, 10:25 PM
#6
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Thread Starter
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.