So during the removal of my supercharger on my 04 XJR I noticed that the vacuum tube that uses the push in quick disconnect fitting had been destroyed some how. I think I monkey work on this motor before me! As far as I know the little brass and plastic fitting it impossible to find.

I looked all around to find the fitting but no luck. And a whole new elbow that comes with the fitting is way to expensive for what I need. So I went to Lowes to see what I could make. I found a 3/8" compression fitting that I thought will work and decided to do a write up for others.



First take threaded middle piece and carefully screw it into the housing after pushing out the old broken brass fitting. Slowly turn the brass fitting into the housing and if when it starts to get a little tough back it out a little. sometimes I took it all the way back out and then cleaned the thread again and screwed it back it. It kind of like tapping the hole but I didn't have the right size tap, but I figured the aluminum is pretty soft. Here's what it looked like after I screwed the fitting all the way down and then took it back out.



As you can see, the fitting made some new thread into the housing. This is just a vacuum tube so it doesn't need to hold and high pressure, just need to be sealed. Next apply some Teflon tape to the fitting and carefully screw it back in.



Next trim the vacuum hose a little because the new fitting will make it stick out further.



Then put it all together and carefully tighten it all down. Once you snug it all down the fitting will clamp down on the plastic hose and be air tight.



Hope this helps others in the same situation. The part was only like $6, so a lot better than like $1K or what ever the elbow goes for.

 

These are the fixes I like. Well done and thanks.

 

This is an old thread but I just found a vacuum leak at this same joint. It is a terrible design as it has a plastic collar and a O-ring which both decay with time and heat. Plus only the entire induction elbow is available for many dollars.


Can't get just the hose section.


I think it's only found on the 4.2L SC in all Jaguars.


I plan to copy your repair and I hope it's been holding up OK?
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Yes, the repair is still holding just fine. No issue from the hose, knock on wood.

 

Thanks for reporting back and I have a bit of news myself!

You can get that little strange fitting from Jaguar and it's only about $15!
Part #C2S15816 and they are all over EBay too.

Here are instructions on how to change it.
https://www.jaguarforums.com/forum/x...itting-119915/

https://www.jaguarforums.com/forum/x...removal-38101/
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Those look the same but seem to be being replaced on X308s. I wonder if they are the exact same size? At any rate I am happy with my repair, there should be no failure in the future due to plastic clips or O-rings. I would still recommend this repair over the OEM style to anyone that has the throttle body off. But still good to get more options and info out about these things to keep repair cost down.

 

Thanks for the warning about the size as I can't tell by looking at it.

I did find one comment by a Jag tech Brutal. He states there are three different sizes of this brass/O-ring part but I have seen several XJR guys claim it worked and my STR has exactly the same SC intake elbow as the SC 4.2L in the XJR.

Still like your idea as it seems a more permanent fix. May just get the factory brass part and the compression fitting so when I take it apart for the second time I can go either way.
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either way, at least they are way cheaper than the dealer selling you a new elbow.