Valve Stem Replacement

Valve Stem

9/28/04

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I broke a valve stem.  Sooner or later I knew it would happen.   I had even provided myself the necessary tools and supplies in my collection of airing-up stuff.

Fittings in container

The stem is a part that costs less than two dollars, but without a spare tire if it happened, it would be a major pain.   I ran some scenarios in my head and came up with the possibility that I could ruin a valve stem after already getting a flat tire.   It made sense to carry a spare stem and the tools necessary to install it on the trail.  Here is what I came up with:

All that for a $2 part?   Well, let's break it down:

  • Break the bead on the tire (Hi-Lift Jack)
  • Install new stem (stem, fishing tool)
  • Re-seat tire bead (valve core tool, compressor, tank, hose, and fittings)

Sheesh!  That's gonna leave a mark...  Yes, the on-board air is a bit pricy.  But in three years, I have used the on-board air on over 100 trips; to inflate sports equipment; air mattresses; bike tires; and several times to assist friends with problems.  I think the price-per-use has been reduced to under a dollar.  And when you need air and the nearest gas station is 20 miles away, I don't know anyone who would walk 20 miles instead of spending a dollar for air.  Fortunately, by the time I needed to install the stem, the on-board air was already installed so that step was out of the way...  The rest of the stuff was sitting in my miscellaneous air parts box and cost me less than a few dollars.

I removed the wheel using a floor jack (Why not? I was at home).  If I had been on the road or trail, I would have used the bottle jack.

Next, I took down the Hi-Lift from it's permanent storage location on the roof rack.

This approach to bead unseating should be considered an emergency approach and avoided if proper tire mounting equipment is available. I put the wheel with the damaged valve stem under the front bumper of the Jeep, lined up the Hi-Lift so that the foot was on the edge of the bead where it goes under the wheel, just to one side of the valve stem.  Then I jacked until the Hi-Lift foot had pushed the bead off the rim.   Great care is needed to avoid having the Jeep fall off the jack when the tire bead pops because the vehicle will drop about 7 inches.  It must be supported by something else.

With the bead unseated, the old stem is removed (usually you can just rip it out with the stem fishing tool attached). 

Valve Stem

The new stem is fitted through the hole from inside the tire and then seated using the stem fishing tool.

Valve Stem Fishing Tool

Next the valve core is removed from the stem to allow faster air flow using the valve core tool.

Valve Core Tool

If your air chuck requires a valve core to allow air to enter the tire, do not remove the valve core.  Next, place some water around the bead area of the tire and inflate the tire.  Start filling the tire while checking for leaks.  The air tank or a fast a/c compressor (or power tank) is required to provide the volume and pressure needed to seat the bead.

The bead should seat if you have a good seal around the tire and wheel when you put air in.  This can be facilitated with a ratchet strap but care must be used to avoid placing it too tightly on the tire since it will be even tighter when the tire is inflated and may be difficult or impossible to remove without letting the air out of the tire.

Once the tire seats (big "POP") check the air pressure and inflate or deflate to the desired pressure, after reinstalling the valve core if it was removed.  Put the wheel back on the vehicle, torque the lug nuts and you're ready to rock!

 

 

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