XF Supercharged induction elbow brake booster fitting
#1
XF Supercharged induction elbow brake booster fitting
In searching for an intake leak in my 2009 XF Supercharged I discovered the brake booster hose was loose in the induction elbow. The red plastic collet in the brass sleeve had become brittle and failed. I then discovered the fitting for the X-type is too small and that Jaguar will only sell the complete induction elbow so I did a little detective work and discovered that the quick connect fitting is made by John Guest in the UK and that the collet is also used in their plumbing fittings. You can leave the brass sleeve in place in the induction elbow – fish out the pieces of broken collet & old o-ring and then fit the collet and o-ring from the plumbing fitting. I did this and my booster hose is now tight.
The red automotive fitting is a 12mm Speedfit item no. MM1412NR. The color is just a dye – all of the collets are made from the same Acetal material, regardless of color. Page 18 of the catalog - http://www.johnguest.com/wp-content/...5-205-0116.pdf Unfortunately, these are only available in boxes of 500 from distributors.
The plumbing fittings also use the same Acetal collet and are available from Amazon, among others. They can sometimes be found singly in the USA but more usually in packs of 10.
This should also work for other V8s with a 12mm brake booster hose.
Hope this helps someone.
The red automotive fitting is a 12mm Speedfit item no. MM1412NR. The color is just a dye – all of the collets are made from the same Acetal material, regardless of color. Page 18 of the catalog - http://www.johnguest.com/wp-content/...5-205-0116.pdf Unfortunately, these are only available in boxes of 500 from distributors.
The plumbing fittings also use the same Acetal collet and are available from Amazon, among others. They can sometimes be found singly in the USA but more usually in packs of 10.
This should also work for other V8s with a 12mm brake booster hose.
Hope this helps someone.
#4
This has been beaten to death by all of us 4.2L SC owners. I would recommend a much simpler repair that has been done to dozens of 4.2L SC V-8's.
Please see this detailed thread on the problem and the various repairs.
https://www.jaguarforums.com/forum/s...-p0174-149418/
Anybody with a 4.2L SC engine should be aware that this P/B connection will fail. The O-Ring will get hard and crack causing a vacuum leak that as it gets worse will set a code. The simple brass fitting repair in the above thread will fix the problem permanently and the brass fitting is about $6.
It's worth a look!
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Please see this detailed thread on the problem and the various repairs.
https://www.jaguarforums.com/forum/s...-p0174-149418/
Anybody with a 4.2L SC engine should be aware that this P/B connection will fail. The O-Ring will get hard and crack causing a vacuum leak that as it gets worse will set a code. The simple brass fitting repair in the above thread will fix the problem permanently and the brass fitting is about $6.
It's worth a look!
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The following users liked this post:
Brayen (04-05-2018)
#5
I saw that thread a while back and I agree - the threaded connector is a good solution but you have to remove the induction elbow in order to remove the brass sleeve and then drill & tap for the threaded brass fitting. The collet and o-ring can be replaced without removing the induction elbow.
The factory fitting that tbird6 recommended is too small in diameter and does not fit but I was able to identify it as a John Guest item so I'm very grateful to him for his post. It was fairly simple then to identify the 12mm version from their catalog and then, through a contact, establish that they use the exact same collet and o-ring in their plumbing fittings so the part I recommended above is a factory original part. I would argue that that is a much simpler solution than removing the induction elbow together with everything needed to access the bottom two screws. Interestingly, the XF, XF SV8 engine bay and Speedfit fittings are shown on their homepage - Automotive | John Guest Speedfit
Being a factory original part, it's true that it will dry out in time but you could upgrade the o-ring to a Viton version which would fare better than the original.
They're both good solutions - it's personal choice which to use. I just wanted to let people know where they could get a direct replacement since Jaguar don't sell one.
The factory fitting that tbird6 recommended is too small in diameter and does not fit but I was able to identify it as a John Guest item so I'm very grateful to him for his post. It was fairly simple then to identify the 12mm version from their catalog and then, through a contact, establish that they use the exact same collet and o-ring in their plumbing fittings so the part I recommended above is a factory original part. I would argue that that is a much simpler solution than removing the induction elbow together with everything needed to access the bottom two screws. Interestingly, the XF, XF SV8 engine bay and Speedfit fittings are shown on their homepage - Automotive | John Guest Speedfit
Being a factory original part, it's true that it will dry out in time but you could upgrade the o-ring to a Viton version which would fare better than the original.
They're both good solutions - it's personal choice which to use. I just wanted to let people know where they could get a direct replacement since Jaguar don't sell one.
#6
Well when are you going to change the hose under the SC?
This WILL need to be changed. It again is another repair that must be done because the hose will fail and leak.
That's when I did the P/B fitting. As long as you don't disturb the P/B connection the vacuum leak is usually small. But I found out that moving the hose during the under SC hose repair completely destroyed what was left of the O-Ring.
You must be a magician because I see no way to fix that P/B connection without removing it. Just no room to work?
I had to tap the brass fitting out of the elbow from the inside which again I could not see how to do without removal.
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This WILL need to be changed. It again is another repair that must be done because the hose will fail and leak.
That's when I did the P/B fitting. As long as you don't disturb the P/B connection the vacuum leak is usually small. But I found out that moving the hose during the under SC hose repair completely destroyed what was left of the O-Ring.
You must be a magician because I see no way to fix that P/B connection without removing it. Just no room to work?
I had to tap the brass fitting out of the elbow from the inside which again I could not see how to do without removal.
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#7
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#10
Did I understand correctly ? - by reference the part in which there is a spare part we need? need to buy and disassemble it?
#11
#13
The tube that plugs into the push connect fitting goes to the brake booster. The one on my 2009 XF Supercharged has a 12mm OD. I checked John Guest's catalog and they don't make a 13mm. They do have 1/2" fittings - I don't know what was fitted to a 1999 S-type. Try measuring away from the end of the brake booster hose to see if it measures differently from the very end which could have been affected by the fuel air mix flowing through the induction elbow. The brass fitting mod that Clubairth1 links to above is also a good solution but you will have to fully remove the induction elbow first.
#14
The tube that plugs into the push connect fitting goes to the brake booster. The one on my 2009 XF Supercharged has a 12mm OD. I checked John Guest's catalog and they don't make a 13mm. They do have 1/2" fittings - I don't know what was fitted to a 1999 S-type. Try measuring away from the end of the brake booster hose to see if it measures differently from the very end which could have been affected by the fuel air mix flowing through the induction elbow. The brass fitting mod that Clubairth1 links to above is also a good solution but you will have to fully remove the induction elbow first.
are no longer working and I can't seem to find the right parts. Any advice?
#15
#16
Is it possible to post the link up again? I can't seem to find it or then I just can't use this platform properly haha. Also, yes I can do the job myself since I already had the supercharger out (did an oil change, solid coupler, new needle bearings and a 10 percent pulley upgrade aswell) It's just a big pain in the *** since the fitment on the xf is super tight near the firewall. Also I already have the parts taken out including the o-ring so it would be really easy to just put the new parts in without disassembling the whole thing again. I'm also not really worried of the parts breaking again since the og ones lasted 14 years. I will say however that the design of some parts in this car are absolute dog s#it, and getting these parts to Finland is also not that fun.
#17
Is it possible to post the link up again? I can't seem to find it or then I just can't use this platform properly haha. Also, yes I can do the job myself since I already had the supercharger out (did an oil change, solid coupler, new needle bearings and a 10 percent pulley upgrade aswell) It's just a big pain in the *** since the fitment on the xf is super tight near the firewall. Also I already have the parts taken out including the o-ring so it would be really easy to just put the new parts in without disassembling the whole thing again. I'm also not really worried of the parts breaking again since the og ones lasted 14 years. I will say however that the design of some parts in this car are absolute dog s#it, and getting these parts to Finland is also not that fun.
https://www.johnguest.com/gb/en/search?text=MM1412NR
Looks like they stopped making that fitting. MM1412NR
https://www.johnguest.com/gb/en/prod...s-male-coupler
more what Clubarith1 was taking about.
Can you not measure the bore 12mm and the pipe and buy an O ring in Viton. from your favourite o ring shop.
e.g.
https://www.polymax.co.uk/o-rings/rubber-viton-oring/
The following users liked this post:
Saaztamoinen (05-12-2024)
#18
Here is the original thread where I found out about replacing all that complicated Jaguar stuff with a $6 brass fitting. So glad I did too as that is a permanent repair.
Brass Fitting Repair
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Brass Fitting Repair
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The following users liked this post:
Saaztamoinen (05-12-2024)
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