How to replace air valve in Cummins/Holset air compressor?

Thread starter #1
I am cleaning/refreshing my air compressor pump but am having trouble getting to one of the components. I cannot figure out how to get the piece in the attached picture apart. It looks like it may be a press fitting but I don't want to throw it in the hydraulic press and risk damaging it if not. Does anyone know how to get at the ring inside this piece? The compressor is a Holset QE296B if that matters. Thanks for any help!
 

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GAnthony

Well-Known Member
Supporter
#2
I am cleaning/refreshing my air compressor pump but am having trouble getting to one of the components. I cannot figure out how to get the piece in the attached picture apart. It looks like it may be a press fitting but I don't want to throw it in the hydraulic press and risk damaging it if not. Does anyone know how to get at the ring inside this piece? The compressor is a Holset QE296B if that matters. Thanks for any help!
@r3gulator3 .........??

this guy is/was a mechanic, hopefully he will see the call i sent out..
 

r3gulator3

Friendly Neighborhood Former Technician
Staff member
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#3
I am cleaning/refreshing my air compressor pump but am having trouble getting to one of the components. I cannot figure out how to get the piece in the attached picture apart. It looks like it may be a press fitting but I don't want to throw it in the hydraulic press and risk damaging it if not. Does anyone know how to get at the ring inside this piece? The compressor is a Holset QE296B if that matters. Thanks for any help!
So, I’m going to warn you up front I don’t have a ton of experience with a Holset compressor but have rebuilt tons of bendix compressor. That part there in the picture to me looks like it should come apart with a pic or screwdriver, looks to be glued in by a rubber seal which over time stick parts together. Due to lighting I can’t tell if there is a snap ring on it. Avoid the hydraulic press. With the exception of driver gear or if belt driven the pulley I have never needed a press or a puller to replace any compressor components.
 
Thread starter #4
I figured it out by accident. If you place a drift into the small vent holes and gently tap, a thick ring on the back side will slip off an interior cylinder. It's a semi-pressed fitting, just the opposite direction from what I was guessing. Thanks for the help!
 

GAnthony

Well-Known Member
Supporter
#5
I figured it out by accident. If you place a drift into the small vent holes and gently tap, a thick ring on the back side will slip off an interior cylinder. It's a semi-pressed fitting, just the opposite direction from what I was guessing. Thanks for the help!
might be easy and safer to get a spanner type of wrench, as to not nick those elongated holes, and maybe cause a sealing problem.

spanner wrenches can be used for many repairs when in need

pics of spanner wrenches - Google Search
 
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