My 2016 F-Type R has just over 33k miles on it. I'm planning a 5,000 mile trip next month in it, so I thought it would be prudent to have the Y-pipe and other bits updated now rather than face potentially doing them (or a full engine replacement) on the road.

FYI, the cost at the local JLR dealer would have been over $5k and, while they would use the one-part plastic JLR manifolds (without a seam like mine had originally), they wouldn't use the newer metal JLR parts or any aftermarket metal parts. I can understand their logic since they give a 1-year warranty on their work and they have the backing of JLR's OEM testing to rely on, but I prefer to go with metal parts.

The cost at a local independent shop that has been around for many decades was only $3.5K for everything (Y-pipe, rear crossover, upper front coolant pipe, thermostat, gaskets, hoses, o-rings). They use alloy parts for everything possible and the job will only take a couple of days. I also had them check a couple of "while you're in there" items: the supercharger coupler and the rear diff seal. The coupler was fine, but the diff seal needed to be redone, as I suspected from the evidence on my garage floor.

I know this isn't a unique story but the reason I opened this thread is to tell you I dodged a big bullet and I recommend you do the same. My car isn't high-mileage but it was a failure waiting to happen. The crossover pipe was already leaking, which explains the occasional coolant smell that I detected. The Y-pipe, though, was ready to go at any time. It wasn't the seam splitting, however. The problem was both of the pipe ends going into the block. When they removed the Y-pipe, everything below the o-ring grooves disintegrated. I guess it was cooked by the heat of the block until it was completely brittle. I'm so glad I had the job done preventatively and I wouldn't have know to do so without this forum, so thanks.

Also, the same shop had a customer last month that bought an earlier Jag with only 11k miles on it, thinking it would be trouble-free for a while at that mileage. You guessed it: the Y-pipe blew within the first 1,000 miles. Fortunately, the owner shut down and didn't blow the engine. They weren't happy to have a big bill so soon but they actually got pretty lucky.

 

Mine (9 years old now but only 50,000km) shat itself a few months back, the mechanics replaced a bunch of pipes and the biggish metal thing (4K thank you very much). I had it back for 2 weeks and then got a low coolant warning, apparently it was leaking from around the water sensor so more parts need to be replaced, should have it back Friday.

What absolutely ***** me is that the car was only in with all of the front bits taken off the engine earlier this year sorting the prolonged problem of a squeaky supercharger belt that I was hyper-fixated on, had I insisted on having this stuff done at the time (rather than just asking them to check it) it probably would have saved me $3K. But overall it has been a spectacularly reliable car, hopefully this will mark the end of the issues I've had over the past 12 months.

 

I thought I saw something recently about the rear crossover manifold now being available from JLR in aluminum ... er ... aluminium as a part for the Defender, but I can't find a reference despite lots of searching here. Was I mistaken? Mine's leaking.

 

I recall that EuroAmp sells one, but don’t recall if JLR does.
https://euro-amp.com/es/collections/...arged-v6-aj126

 

Be sure and change the SC oil when you get the SC off. It's a lot easier.
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I'm getting my annual service done next week, and went out today to inspect the pipes. The rear crossover manifold is leaking

While I could do the work myself I have neither the time nor the garage, so I'll just have to buy some E-tickets for this ride. On the positive side, now that my symposer has been "wished out to the cornfield" (and I have a V6, which has the filler on the top) the SC oil is a snap.

 

Yea the V6 is more service friendly.

I hope what you heard is true about the metal rear water manifold. I have only seen the after market versions as DJS posted.
Makes sense because JLR has come back and released the front pipes in metal. So it's possible.
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I might have considered going to the JLR dealer for the service if they would have used the metal JLR parts. Since they wouldn't use them, it was an easy decision to go with the independent shop and they used a metal rear manifold (aftermarket). They also used a thermostat with a metal housing and I didn't even realize a) the OEM uses plastic and b) alloy-bodied ones are available.

 

My service advisor is the one that first mentioned aluminum for the other two pipes but he said there is no JLR aluminum version of the crossover manifold. The only metal crossover manifolds references I've found have all been aftermarket, so that seems to be the case.

 

When I did my repairs replacing with aluminum, I found the same as the OP. The O-Ring seats on the Y-Pipe had both disintegrated leaving broken parts in the valley openings. No splits along the seams at all.




I replaced all of these parts with aluminum aftermarket, including the small connector pipe that goes from the water pump to the oil cooler. Luckily, I did not have issues with the aluminum connector pipe as other have had. The crossover pipe was changed to aluminum too although my original plastic one looked OK at the time of change.

 

Where do you all suggest purchasing aluminum y-pipes from and is it crucial to go OEM? I'm leaning towards OEM; my local JLR shop wants $1100 for parts, Rover Parts Depot has them for $400 which still seems high. Open to non OEM options if some of you have had positive experiences. I've crossed off Euro Amp due to some bad reviews. Thanks!

 

I got my alloy bits from EuroAmp. Kit included all pipes, water pump, t-stat, and various other bits, as well as supercharger gaskets and solid coupler. I had mechanic do supercharger oil and belt while in there.

 

NOTE that even if you buy EuroAMP's complete kit (with water pump etc) your tech may need to replace a couple parts that are different.
On our early '14 (assembled in 2013) the thermostat housing was different so our tech obtained a plastic one from JLR.

 

For reference some guides on the process





Same engine in Xf,Xj ,F-type,F-tpace

 

I used EuroAmp right after it came out maybe 2 years ago. Put in by my inde and have 0 problems. He is my regular for both my cars so he has no problem with me bringing parts. He set up a wholesale account with them.

 

The JLR metal Y pipe LR186859 plus LR186917. You should be able to purchase them for around $270.
The additional factory parts to do a complete service cost me $1,350.94. My local parts manager matched Harper's prices mostly.
My BMW tech buddy who begrudgingly also works on JLR's did the complete service in about 6 hours.
I helped, changed the oil in the super charger and fetched a wrench or two.

 

I am about to do the same and have a list, mind sharing the list of parts you used for your service (other than the JLR aluminum front pipes)? Would like to reconcile with mine, thanks in advance!

 

AJ813909 WATER PUMP
AJ811948 GASKET
AJ811576 GASKET
AJ811590 GASKET
AJ811539 SEAL (x2)
C2Z28265 GASKET
AJ811904 GASKET
AJ814056 PIPE
C2Z19929 THERMOSTAT
C2Z22073 TUBE
C2Z28258 TUBE
C2D60163 KIT-SERVICE
C2D61183 BELT
AJ813614 HOSE
T2R5910 HOSE
LR011038 PLUG
CDD49666 TENSIONER
AJ813002 PLATE
T2R91501 BELT

We did this in February of 2025 at 95,000 mile. Part numbers were current at that point and I'm sure prices have gone up a bit. The LR plug is the symposer port plug.
We used the aftermarket metal pipe between the WP and the oil cooler but I made sure I used the OE seals.
We changed the gasket for the oil cooler. This is hardly ever done SOP but seems foolish not to change it while the SC is removed. Most of the plastic clips under the SC that held onto wires were parched. If I had it to do over I'd get all of those too.

 

Awesome, much appreciated! Some of these I didn't have.

 

I wish to amend my remarks.
C2D60163 are crank case vents. (x2)
The LR number is the vent plug for the crossover pipe.
The AJ813002 is the symposer plug.
I did not pay attention to quantities when typing the list. My apologies.