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2006-2009 Range Rover MkIII / L322
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Hi,
I need help identifying this part? I have been getting PO171 PO174 Error and my indie shop called and said this part is leaking air. I recently replaced the engine with a used engine. I ket the old engine for spares, and they called me to see if I had this part. I don't have this part.

20181228_173824.jpg

Thanks in
 

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2006-2009 Range Rover MkIII / L322
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Discussion Starter #3
Thanks Brad for taking a guess. I'm hoping that someone will help me out with a part#.

Is there a parts catalog with LR Parts Numbers online?
 

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2006-2009 Range Rover MkIII / L322
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Lou its a eaton part. Not know in english. Its a supercharger idle valve like something.
I think this part is not guilty. Its very mechanical part on supercharger unit.
You have to check injector o rings.
 

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Discussion Starter #5
Brad S1 said it was "Waste Gate" for supercharger. I have done a lot of searches trying to find a picture or part number. I suspect the leak might be close to that part. Still searching for a solution.
 

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Do you know if that part will actually work on the RR though? What's listed is what I have on my Cobra. Last time I was under the hood of the rover I remember the waste gate being different from what's on my SVT (I could be wrong though)... Regardless OP what that thing does is it's under vacuum and has a rod attached to a valve on the body of the blower itself... Under normal conditions the bypass valve is open on the blower allowing air passing through the supercharger to recirculate through the intake (no boost). When you give it enough pedal under vacuum that actuator will move the rod, close the valve (bypass) on the blower and you'll be into boost. Intake charge can no longer recirculate with this valve closed and is forced into compression (boost)

If you slowly rev the rover up under load (on the highway) and don't hear whining that's good, if you do the valve is stuck in the closed position (not good)... If you hammer down on the rover on the highway and you hear supercharger whine, then let off and it immediately stops the valve is probably working. If you're hearing supercharger whine all the time that's bad! If you can verify the bypass works maybe the body of the thing just developed a small leak which maybe you can plug with RTV until you can source the part. Either way you want this thing to be working properly.
 

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2006-2009 Range Rover MkIII / L322
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Discussion Starter #10
20181231_153657.jpg 20181231_153724.jpg



It looks like I have a spare in my garage from my old engine. Is the number printed on the top the LR Part Number?

The shop said that it was sucking air. This is my first supercharged vehicle. Would it be normal for it to be "sucking air" when idling, or is this an issue?

Thanks!

Lou
 

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2006-2009 Range Rover MkIII / L322
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It's operated by manifold pressure (vacuum), so it could be a leak in the plastic housing, the hose going to it, or the diaphragm inside may have split. So yes it will suck air in if any of those things happened, its essentially a vacuum leak, but its not normal. There may be a small vent hole in the bottom portion of the ring that joins the two halves together to prevent a vacuum lock and allow the valve to close. If so that may be where the sucking noise is coming from, sort of like the hiss on the PCV valve, but you should only hear a noise like that when the valve is moving, if it hisses all the time I owuld suspect the diaphragm inside that operates the rod is leaking.
 

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Discussion Starter #12
Thanks Mark C for explanation, and taking time to share your expertise.

Lou
 

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1995-2002 Range Rover P38A
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This discussion has enticed me to research my new engine technology.
I thought the supercharger had boost on tap as my turbo diesel has from idle.
Finding out now the incoming air bypasses the supercharger until the actuator redirects into the supercharger which is why you only hear it at higher RPM.
Some very interesting reads online.

https://www.v6mustang.com/threads/psa-proper-m112-boost-bypass-actuator-vac-lines.264471/

http://www.3800supercharger.net/how.html

https://www.diyford.com/eatonmagnuson-superchargers-guide-in-ford-small-blocks/




Sent from my iPhone X
 

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This discussion has enticed me to research my new engine technology.
I thought the supercharger had boost on tap as my turbo diesel has from idle.
Finding out now the incoming air bypasses the supercharger until the actuator redirects into the supercharger which is why you only hear it at higher RPM.
Some very interesting reads online.

https://www.v6mustang.com/threads/psa-proper-m112-boost-bypass-actuator-vac-lines.264471/

http://www.3800supercharger.net/how.html

https://www.diyford.com/eatonmagnuson-superchargers-guide-in-ford-small-blocks/




Sent from my iPhone X
The air is already in the supercharger, when the bypass is open it just allows the air to recirculate back into the intake (path of least resistance). You still have power on tap as the second you mash the gas the valve closes, air can no longer recirculate and becomes compressed into the lower intake/combustion. It is no different than a waste gate on a turbo, you don't want to be under boost in normal driving conditions as it'd be inefficient and cause damage.
 

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Discussion Starter #16
I wanted to update my thread.

It turns out that the leak was from the long hose that contacts PCV and throttle body.

When we removed the long hose there was a scrape, and tiny hole. This probably happend when engine was removed from salvage vehicle, or possibly during transport.

The waste gate/supercharger bypass valve was not leaking.

Thanks for all the help!
 
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