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Just thought I'd leave this here as it might be relevant. JLR produced the upper and lower pipes in cast iron and aluminum for the V8 Defender and compatible with the F-type.
Part numbers LR186859 and LR186917 not sure if rear pipe Engine Coolant Outlet Flange is available in metal, apparently not.
Thats what I’ve been saying. See my post starting at #595
See my post # 14 above. Main dealer fitted the revised design on mine in Warranty and they only lasted three years before they too failed the same way the original Versions did. JR now offer I versions as an option.
I disagree. The newer plastic pipes are just fine. The old style pipes fail because the plastic weld on the 2-piece clamshell will eventually leak. The new pipes are 1-piece, eliminating this design defect. If you had the exact same failure, then something is very odd, because this rules out a clamshell failure in the old pipes. I'd be looking for some other cause (like a heat leak, cooling obstruction, or something else out of the ordinary). Looking collectively across Jag forums (this pipe is used in many models), there's no evidence that the new pipes are an issue. That's just a simple observation.
Sure, you can pay to have aluminum pipes installed (though those suffer from even larger installation issues, see this forum for several examples). I honestly don't think its needed.
Last edited by diablo2112; Mar 5, 2025 at 03:17 PM.
I disagree. The newer plastic pipes are just fine. The old style pipes fail because the plastic weld on the 2-piece clamshell will eventually leak. The new pipes are 1-piece, eliminating this design defect. If you had the exact same failure, then something is very odd. I'd be looking for some other cause (like a heat leak or something else out of the ordinary. Looking collectively across Jag forums (this pipe is used in many models), there's no evidence that the new pipes are an issue. That's just a simple observation.
Sure, you can pay to have aluminum pipes installed (though those suffer from even larger installation issues, see this forum for several examples). I honestly don't think its needed.
Still false. Some have had the seams fail but the majority of the failures occur where the plastic enters the alloy block. The plastic crumbles to dust. Happened twice with the crossovers on this engine as well as the other plastic connectors elsewhere in the circuit including supercharger pump, heater lines, radiator, thermostat, throttle body, etc. Over time they just fall off and crumble. If you research these forums you will find many members with the same failures along with pics. I have substantial experience servicing these engines and speak from knowledge.
The JLR genuine alloy pipes have 0 issues with fitment they even come installed
in new vehicles. If there were manufacturing issues at JLR they would have obviously been addressed by JLR.
Well I for one have had the newer plastic pipes installed on BOTH my Jags. But you know with Jag no longer making the engine, I wondered how long the supply of the OEM aluminum pipes would last not. Hoping to keep my cars for a long time, I went ahead and ordered the OEM aluminum pipes just to have on hand. Call me a hoarder, but with Tariffs and limited supplies, the price on these are just going to climb and eventually become obsolete. At least with them being OEM I shouldn't have to worry about O-ring fitment or pin holes. Just Saying!
@diablo2112 I too thought the glued seam was the problem. And for the rear pipe it may well be (based on @CarlB's photos). But from the UK forum - some nice pics of the newer version plastic pipe with failure at the junction @jahummer emphasized:
Not to beat a dead horse, just please understand it's the plastic that's the primary problem. On mine nearly every bit of plastic pipe throughout the entire circuit's failed at some point. Yes some seams leak but it doesn't matter when the pipe disintegrates. Here are some pics, they all look the same as mine did. As you can see they consistently fail the exact same way, both the latest versions and the originals. Fortunately there's genuine JLR alloy versions which're a perfect fit and lifetime solution.
WSHudds the current water pump from JLR has a part number that ends in 3909. They all had Aluminum housings. JLR has revised the WP at least 5 times since it's original release in 2009-2010. My original 2014 XJR WP started leaking at around 30K miles and I had the WP and the 2 front plastic pipes replaced under warranty.
There are after market WP's out there too.
Great pictures of the plastic failures. It's just a matter of time before they fail. I have replaced my rear water manifold with the 2 piece after market version. I took it apart and drilled the passages out to full size based on a thread on this forum. I learned a bunch about the rear water manifolds too!
Great info from member Bydand!
Take a look if your interested and it is a bit long. Rear Water Manifold
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WSHudds the current water pump from JLR has a part number that ends in 3909. They all had Aluminum housings. JLR has revised the WP at least 5 times since it's original release in 2009-2010.
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The part numbers have changed multiple times, but that's quite common with JLR without any actual changes to the parts. I am only aware of 1 change, from a multi-piece body with multiple gaskets to a 1-piece design with 1 gasket. Do you know what the other design changes were?
No only that Jaguar kept changing the part numbers and they never said why or what changed. Only that this part number is now the recommended one and is the one that the dealers were using.
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If manufacturers start sourcing a part from a different supplier--even with no changes--they will give it a different part number in case of a manufacturing defect or recall that affects only the newly sourced parts. So it's not uncommon for the same part to have different OEM part numbers over time.
Just thought I'd leave this here as it might be relevant. JLR produced the upper and lower pipes in cast iron and aluminum for the V8 Defender and compatible with the F-type.
Part numbers LR186859 and LR186917 not sure if rear pipe Engine Coolant Outlet Flange is available in metal, apparently not.
Just had a quote from my JLR specialist in West Yorkshire to replace the 3 problematic plastic pipes for alloy ones including the new alloy water pump. £1,350 (circa US$1,700) for parts, labour (6.5 hours) and taxes. I'm not sure if I'll get it done this year as the car's only done 34K miles but it's really not a lot of money for peace of mind.
Just changed mine out. They were the original design and made it 92,000 miles. When we pulled the Y pipe it was way corroded. One thing to note, we used the updated JLR aluminum parts and there’s one flange that is significantly less thick than it’s plastic cousin requiring us to shorted the existing fastener.
