Can we talk about the 5.0L water pump
 

Just wanted to move to a thread talking to the discussed issue of the water pump. Does anyone know when the "improved " version of the water pump was put into the SIII XKR. Was there a TSB or is there a vin number when they cut this in. How do you know if you have the updated version or if you have one that is prone to failure. Also what is the failure rate of the bad design pump or can they run for 100k miles without failure. If this was a 5.0L problem was it corrected in 2011 or 2012 or 2013 .

There is a thread with some of the information your looking for. However, I don't remember. I'll search...

Copied from another thread: https://www.jaguarforums.com/forum/x...-118826/page4/



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This is the text from one of the Jaguar technical bulletins on the 5.0L water pumps:

Cause: Coolant ingress into the bearing housing leads to corrosion of the bearing and incorrect support for the impeller shaft. This in turn causes accelerated wear of the mechanical flat face seal leading to coolant loss sufficient to generate a low coolant level warning message in the Instrument Pack display.

NOTE: The water pump can display some dry coolant residue on the pump body, and surrounding area, during normal operation. A small amount of coolant may temporarily weep through the pump seals or from the evaporation chamber. This does not affect the operation of the pump or the cooling system, and it does not damage the water pump. A small amount of dry coolant residue on the pump body, pulleys, belts, or around the front of the engine are not alone sufficient justification for changing a water pump.

Then there is SSM50177:

Issue: The Customer reports a low coolant message on the instrument pack display. A coolant leak is identified from the area around the coolant pump pulley. This affects 5.0L engines only on XJ, XF, XK.

Cause: Internal sealing failure.
Action: Revised water pumps are available to order through Unipart, part number C2D 20660.






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Quote:
Originally Posted by bocatrip https://www.jaguarforums.com/forum/i...s/viewpost.gif
It seems from a pervious post that the part number for this revised water pump has been updated twice.

Yup, I was just quoting the SSM from 2011. The latest number is coming up as C2Z21781.

here here!! I second that!!!!

Do we know what year or vin # the latest pumps were installed in?

My sense from all these failures is that from 2010 on, the water pumps do fail and at lower mileage. Since most of our cars are not daily drivers and don't usually have many miles, it would be difficult but not impossible to get a poll of XK/XKR owners who have replaced their water pumps. I didn't realize until rereading parts of that old thread that we can actually get a "low coolant" message. I thought we only get the "engine overheating" message. If the "low coolant" message actually comes on when it should at least we would have an option to immediately stop before the engine is toast.

This is from the parts manual. The circular arrows mean that the part has been superceded

It depends how quickly the coolant has been lost. If the level is just low then you wouldn't expect any damage to occur but if you have burst a hose and lost all the water then you don't have long before the engine gets damaged.

I am surprised at the advice in the handbooks. I wouldn't leave my engine idling for 5 minutes if it claimed to be overheating!

While I do not have a 5.0L engine, in my 2009 Jaguar XKR, I did find the following which may or may not help you reference your 5.0L engine.

Jaguar TSB:

Date: 06-01-2013 TSB#TT002-13 Keeping the Cooling System Free of Debris and Corrosion to Prevent Premature Water Pump failure

Date: Dec 2012 TSB#JTB00278 Cooling System - Water Pump Leak

I just don't have access to the bulletins themselves.

Also here's a link to a past forum search:

https://www.jaguarforums.com/forum/x...012-xk-106548/

We must have just a handful of members that are active on these forums. After reading the above thread, I see the same members who were inquiring then that are inquiring now.(including myself)

OK great and according to this I have the next to last update. Now I wonder what changes were made and why.

How do you read this chart?


If your VIN falls in the range of the second last range with no circular arrows does this mean you have the most recent water pump even though there is a different water pump for last VIN range? Why doesn't the second last range have circular arrows?

You would have thought with all of the problems related to the water pumps on the early 4.0L V8, Jaguar would not be still dealing with this defective part. Thought I was at least safe from that problem when I got a 2010. Plus now I get to worry about the leather dash also which is a much bigger one.

I guess the 660 was replaced by the 781 and then there was another model which may be new but not a replacement. If it doesn't have a circle then the model must not have the failure problem. That's how I read it.

I am not sure. I tend to put part numbers from my parts list in to the search window on JagSpares.co.uk because they list the latest part number for whatever you enter. Both of the last ones in that list seem to be current.

I assume they get their info direct from Jaguar so maybe there is a mistake in the parts system because I can't think of a reason why the last of the 5.0L water pumps should be different.

Every car has something even Lexus. If you want to make yourself feel better, go over to the Aston Martin forums and read about some real headaches.

+1

This kinda sounds like one of those 'good precaution' upgrades like the 4.0 tensioners & water pump. I had the pump fail on my XK8; fortunately it wasn't a complete failure, and the car was drivable in short bursts.

Hey Ngarara, what are part numbers for those 2? Hmmmm... what a 4.0 tensioner, whats it do, what happens when i breaks??

Why was a RECALL not done on these upgraded parts after failure!?!?!!

Those are on the 4.0 engine from the XK8 & XJ8 - not a concern for you, Loth. Basically, they made some of the parts out of plastic, like the timing-chain tensioners (which keep the chains tight) and the water pump impeller. After a few years of exposure to heat and oil, the plastic became brittle and started to crack & in some cases disintegrate.

Basically, if you have a car with a 4.0 engine, it's a good idea to upgrade those parts to their later metal replacements. Why didn't Jag recall & replace them all? - well, they didn't start failing until the cars were well out of warranty, they don't always fail, and it would have been a massive and very expensive process. And, of course, it's not a safety issue, so no-one can force them to.