The result of an overheat on a V8R!

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The result of an overheat on a V8R!

Postby J44EAG » Sun Aug 28, 2016 12:19 pm

Seen on ebay, a 4 litre V8 XJR engine suitable for spares or repairs.

The engine popped a coolant pipe, overheated, dropped a valve seat and knocked a hole in a piston crown! Un-seen and un-loved, the valley pipe gives up after high mileage and advanced years. The cost of the pipe is about £25. The difficulties of charger removal are horrific due to tight working space. However that pipe must be inspected to ensure it does not expand, split, rot and and eventually blow right open which can lead to a written off engine. Have you replaced your valley pipe recently? Here is the reason why you should!
Blown 4 litre V8.jpg
We all commonly know that 4 litre engines must have their timing tensioners up-graded to the ali type if they are to survive. Most will have hopefully had this modification carried out. It is of vital importance. On an equal level the valley pipe should be seen in a similar light.

Although the above image is of the 4 litre XJR engine, the issue also affects the 4.2 installed in S-type R, XKR, XJR and early 4.2 XFR models. The replacement pipe part number is 2W93-9F814-BC. (Late edit correction to part number) Note the bulged portion of the pipe in this image. The damage is a couple of inches back from the fat end of the pipe. The material structure decays, the pipe becomes soft and eventually balloons before splitting wide open! Whooosh!!!!!
20160815_172409.jpg
Here is a good clear image of the valley pipe which has been replaced. The damage forms at the right hand side of the pipe in this shot. Picture courtesy of Lawson Smith at Powerhouse Engineering. Ignore the red and blue pipes...that is part of a nitrous oxide installation!
car-nitrous-installation-3.jpg
car-nitrous-installation-3.jpg (148.88 KiB) Viewed 3377 times
Mike K
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2004 XJR

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Re: The result of an overheat on a V8R!

Postby [email protected] » Wed Feb 15, 2017 8:02 pm

Hi Mike,
i am new to this forum but not new to Jaguar,having driven only jaguar's for the past 25 years.

After reading your article on the Valley pipe issue,I contacted my Independent Jaguar specialist to enquire about cost of replacing.
I have a 350 Super V8 2004 with 97000 miles on the clock.

I was told by the specialist that this issue did not apply to my car,and he added that he had many enquires after your artical,and had to tell everyone the same.
I am now confused. Do i need to replace the valley pipe and overide my Jaguar specialist. He does have a very good reputation in his area.

Any help that you can give to help sort out the confusion would be appreciated.

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Re: The result of an overheat on a V8R!

Postby J44EAG » Wed Feb 15, 2017 8:21 pm

All supercharged S-type, X350R, XKR and 4.2 XFR have the valley pipe. Believe me, it is down there buried under the supercharger. Indeed, several members have found it and changed it following publication of the article. As I write, I have that defective pipe in my hand. The part number is 2W93-9F814-BC which came off my own car. Rob Jenner also confirmed to me as I wrote that article, that all super charged V8 cars have the pipe.

Had I been wrong, Dave Marks would have been the first to correct such an error in print. Why not call XJK, Lawson Smith at Powerhouse Automotive or any other jaguar Independent operator to confirm? Don`t just take my word for it. The images above surely confirm the existence of the pipe.

I fail to understand why you have been told you do not have the pipe! Everyone else has!! Roger, iRS, who appears on this Forum has also done one on his Super V8 under my guidance.

Changing the pipe is a nasty job. The charger must come off to see the pipe. The throttle body elbow, EGR valve and by-pass actuator all have to be removed, then the charger. Perhaps your garage does not want to do the job? I don`t blame them. Plenty of cussing, frustration and cut knuckles.

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Re: The result of an overheat on a V8R!

Postby iRS » Wed Feb 15, 2017 10:11 pm

Keith, I have a Super V8 too. In my case a 2005 with 180,000 miles. I can confirm that they do have a valley pipe as I have recently had to change it. You can check this for yourself quite easily. If you pull the engine cover off and look to the back of the engine, you should see two rubber pipes going to the throttle body. one of these is the valley pipe. The other is a short pipe that goes to the ERG valve and then off that is a pipe that runs back across the top and side of the supercharger - this one is more visible than the valley pipe. Its a big job to get the supercharger off and one that I can see many would go to great lengths to avoid, but a true specialist will get the job done. Hope this helps.
Roger S
Aberdeenshire
XJS FORUM ASSISTANT COORDINATOR

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1976 XJ-S - original factory manual. Currently in many pieces.
X350 - 2005 Super V8
1962 MGB

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Re: The result of an overheat on a V8R!

Postby iRS » Thu Feb 16, 2017 9:05 am

I've just taken a look at my car and taken this photo.
IMG_0296 copy.jpg
Viewing from the driver's wing side, you can just see the two pipes going to the throttle body - looking very new in my case. Right at the bottom of the shot is the other pipe I mentioned. Its really not very easy to see any of this without a lot of stuff being removed.

Here's a photo of the full valley pipe.
IMG_0268 copy.jpg
The point of failure is the 1" or so of larger diameter pipe right at the end. You might just see the pin prick hole.
IMG_0270 copy.jpg
Roger S
Aberdeenshire
XJS FORUM ASSISTANT COORDINATOR

Early E
1976 XJ-S - original factory manual. Currently in many pieces.
X350 - 2005 Super V8
1962 MGB

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Re: The result of an overheat on a V8R!

Postby J44EAG » Thu Feb 16, 2017 9:24 am

A nice series of shots, Roger.

The pipe is identical to the one I eventually saw fitted on my car and which was replaced by the 2W93-9F814-BC component as shown in my early posts.

I can`t help feeling Keith has been fed duff gen and wonder what the repair guys would say if his car were to turn up on a flat bed truck with a split hose? The concern initially is that Keiths` car is in some danger and also those that the garage have also turned away. A wrecked engine is going to cost thousands to replace, whereas the pipe cost is only around £25.

That pipe is fitted to both XJR models and the Super V8 which share the same supercharged engine.

Mike K
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Re: The result of an overheat on a V8R!

Postby J44EAG » Sun Feb 19, 2017 7:01 pm

Roger`s full valley pipe story can be found in this link. The valley pipe is shown in photographs within the text.

https://jec.org.uk/forums/viewtopic.php?f=281&t=11137

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Re: The result of an overheat on a V8R!

Postby [email protected] » Fri Mar 03, 2017 8:06 pm

Can I just say thanks to everyone who has taken the time to answer my query on the valley pipe.

You have left me in no doubt that my car does have one and is will need to have a replacement sometime in the near future.
I will be taking the issue up again with the independent jaguar specialist that told me It did not apply to my car.Thank goodness for Jaguar Enthusiast club.

Keith.

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Re: The result of an overheat on a V8R!

Postby J44EAG » Fri Mar 03, 2017 9:32 pm

We are all happy to help. Knowledge is everything and the more we can share, the easier it is for us to keep our cars running with as minimal cost as possible. Yip, the JEC is a great Club. Knowing who to contact to get the correct and unbiased information has saved me a fortune over the years.

Keep in touch, Keith and let us know how you get on.

Mike K
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Re: The result of an overheat on a V8R!

Postby ptjs1 » Fri Mar 10, 2017 7:00 pm

Keith,

I'm sorry to hear that youve been getting conflicting views on this. If, as you say, this specialist has been advising a number of members that they do not have valley pipes on their cars, then this is something that we need to resolve. Because it means that either the specilaist is aware of some information on these S/C cars that we do not know, or else there are a now a number of members who incorrectly believe that they are safe from the potential problem.

In order to clarify the situation, can I suggest that you email Mike with the details of the specilaist in order that he can follow up directly with them on behalf of the club. In that way we will either all be better informed, or else the specilaist will become better informed! Either way, somone will benefit from that discussion!

Paul
1995 XJS 4.0 Convertible
1980 XJ-S Pre-HE
Jaguar 4.2 Supercharged engine (but not with a Jaguar body..)


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