A good question to ask! I had my 2017s flanged pipes replaced in 2021. After that I obtained a set of the metal pipes, just stored for now. Sorry to read your replacement plastics are leaking and where, but it gives me a better idea of what may be ahead.

 

Quick update as I've just recently completed the y-pipe replacement procedure. The "improved" plastic y-pipe failed, as suspected, at the connection point with the block. The flanges literally separated/disintegrated and I was experiencing a slow leak. The entire process of removing the supercharger was easier than anticipated and everything went smoothly, but I discovered that the aftermarket aluminum top pipe that connects to the Y-pipe had its mounting points misaligned. It took some grinding to get it to fit, but all's well now and no more leaks for the time being. The aftermarket part was an inexpensive, Chinese knock-off, so no surprise there, but its O-rings fit very well into the block, so that's the crucial part. I replaced the SC coupler and SC oil white at it. There was some play in the turbine, which the new coupler minimized. I went with the stock design.

 

Might be a dumb question but how do I know if I have the revised (seamless) Y pipe? I have a MY18 f-type R. Taking her to get the 6 year maintenance service work done soon and might get the revised y pipe installed since it’ll already be in the shop. Thanks y’all!

 

Look at the photos in the above post. If your black pipes are round like a piece of pvc, those are the newer ones. If your pipes have flanges, those are the old style. The aluminum ones are available from an aftermarket vendor or, possibly now with JLR part number, through JLR.

 

Not a dumb question at all. The original design of the Y-pipe was made up of two plastic halves, glued together. Most would fail eventually, as the glue did not last too long. The revised design from JLR was a one piece Y-pipe, but still plastic, so while the pipe itself would not crack, the plastic flanges that hold O-rings which connect into the block start to leak as the plastic melts, separates and disintegrates, eventually. The newest, aluminum design, promises to outlast the engine as it's unlikely to crack or melt or disintegrate. Time will tell. The only weakness point may be the O-rings. We will see...

 

2015 F-Type R here with about 36k miles. Just had my 11 year old original terrible seamed pipes replaced with new JLR aluminum pipes. They were in great shape - no problems at the seams, flanges were in good shape! Go figure. Water pump was seeping though (common). Will post photos when I get back in a couple weeks.

 

So it must be mileage and not age related deterioration then. I have 112K miles on mine. It's a peace of mind to have those replaced. You don't want to find yourself stranded with coolant all gone.

 

Absolutely, all motors get coolant leaks at some point, but sometimes these plastic pipes can really let go and evacuate the majority of coolant in a very short period of time. Other marques like Porsche, BMW, Mercedes have had similar results with their plastic coolant pipes and caps. You would think they'd learn. Our AJ motors do not tolerate overheating well.

I think mileage is a good base metric, but equally important is probably time, environment, history, care. A car that is driven around town all its life on short trips will have more wear (everywhere) at 50k than a car that does 100 miles of commuting daily. A car that has run frequently at the track (circuit or drag strip) will obviously have more wear. A car that has sat around for 11 years with 30k miles - mine was fine surprisingly but I was worried - mine lives in a garage in the cooler NE, so that can't hurt. People who "hoon" these cars in parking lots, it is bound to take a toll (I even theorized that repeated throttle abuse can wear engine mounts and engine rotation can shake a lot of things loose if it gets bad/frequent enough, but I also may be talking out of my *** ). My personal take is, greater than 8 years or 50k start budgeting for it. If you smell any coolant, watch the rate of drop, and start budgeting.

Agree on you mentioning the orings. Even aluminum pipes aren't forever as they have rubber orings which will eventually fail. But much longer, and when they do they should give you plenty of warning and time to deal with the work.

 

Appreciate all the insight guys! Looks like I’m adding a y pipe replacement to my service lol don’t mind spending a couple hundred extra and avoid bigger problems down the line. Also if anyone has the carbon fiber mirror caps and would like to sell them, let me know. They discounted them according to my Jaguar dealer 🙁

 

Just some post coolant system overhaul forensics, most things except the water pump were in fantastic shape foe a 2015 R with 34k miles. Just goes to show, environment matters (these are the old seamed pipes too):









Symposed and the other hoses weren't all that bad either, maybe a little stiff. Water pump had been seeping for years.