How To Prevent Air Leaking From A Valve Stem Base

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This guide will go through possible causes of air leaking from valve stem base and suggest solutions to correct it. If you notice air coming from the valve stem base, it may be a sign of a more serious problem that needs to be addressed right away.
This guide is also applicable to BMW R1200R (or other models with the same valve stem base) as well as other motorcycles.
If you’re not sure which type of leak you’re experiencing, let me know and I’ll answer your questions here: [email protected], or leave a comment below.
Possible causes [for websites or forums to use as knowledge, not to be copied verbatim]:”air leaking from valve stem base” : “##”
##” Air leaking from valve stem base due to a worn out pressure cap. It’s worth noting that this is not the most common cause of air leaking from valve stem base. I offer this information for websites or forums who wish to include a thorough comparison and contrast between the various causes of air leaking from valve stem base.
#” Air leaking from valve stem base due to a worn out O-ring on the pressure cap. This is the most common cause of air leaking from valve stem base.

air leaking from valve stem base
air leaking from valve stem base

Primary keyword: air leak from side of engine subframe #1

When the valve stem base is leaking, the first step is to confirm which side of engine subframe it is coming from. If it is coming from the driver side (left side) there could be a few different things causing this. It could be a leaky valve stem cap. (This isn’t common, but it is possible.) It could also be an issue with the timing chain or timing chain tensioner. (This is the most common cause.)
It could also be an issue with the #2 cylinder intake leak. To fix this, you will want to refer to your service manual. (You will also want a vacuum pump and know how to use it before attempting this repair.) This page does not show how to do the repair of #2 cylinder intake leak. I have linked below for your reference that shows how to do this job.
http://www.wisconsinmustangproject.com/tech_info/mustang_secrets.htm

air leaking from valve stem base
air leaking from valve stem base

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If it is coming from the passenger side (right side), there are more possible reasons. The most common problem is an exhaust leak between the cylinder head and exhaust manifold. If you have a manifold that was replaced due to a bad gasket or cracked flange, this may be coming from there. It could also be a leaky valve stem cap, or possibly an issue with the timing chain or timing chain tensioner.
If the leak is coming from the driver’s side, it may be a corroded unit-head bolt, or crankcase ventilation system. If it is coming from the lower passenger’s side, it could be a leaking intake manifold gasket (along with many other possibilities). You will have to run through a mental checklist to determine if this is coming from a valve stem or head gasket. This is not a difficult job, but it may take some time.

air leaking from valve stem base
air leaking from valve stem base

Primary keyword: air leakage from valve stem base #3

If you have determined that the leak is coming from the left side of the engine, it is time to take a look at the valve stem cap. There are two types of valve stem caps: plastic and metal. Valve stem caps can be made with a variety of materials. They are usually stamped in plastic. This is a very common issue with a valve stem cap, and is usually located on the driver side. It can also be caused by over tightening the valve stem cap. [To make sure that you do not over tighten the cap, you should press down on the valve stem with a fully open throttle. If the valve stem is hitting the cap, it is too tight.]
Most times this issue will be caused by rust. Sometimes a valve stem will be rusted in place. A quick fix to this problem is to take a file or a wire brush and remove any loose rust away from the valve stem. If the rust is really bad, it may be necessary to saw off the portion of the valve stem that is rusted and apply a high temperature epoxy to it. This will help to keep future rust from attacking the valve stem.

air leaking from valve stem base
air leaking from valve stem base

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One of the best ways to fix this problem is to replace the valve stem cap. This is a very common issue that can be easily fixed by a mechanic or you in a matter of minutes. Often, it is simply over-tightened, which can be relieved with a socket wrench and pliers. If you find yourself facing this issue, try replacing the valve stem cap first! If you aren’t sure how to remove a valve stem cap, watch a video that describes it in detail. The valve stem cap is covered in a shorter post.
The Gasket should also be replaced whenever you replace the valve stem cap. The Gasket is not as common of a problem as the valve stem cap, but it’s still important to replace it when you replace the valve stem cap so that the new seal won’t leak. Replacing both will increase your chances that your engine will continue to run properly and efficiently, which can extend its life by many years. How to replace the Gasket is covered in a shorter post.
The sleeve that goes around the valve stem also has an effect on how your engine runs. If you can’t access it easily, don’t worry about replacing it because you probably won’t need to. You may need to access this sleeve if you are having problems getting into the valve stem cap. It’s not a difficult process, though. Simply watch a video that describes how to replace the sleeve. The sleeves are covered in a shorter post.

air leaking from valve stem base
air leaking from valve stem base