I have a question about the cooling elements that I have to replace in a xk 4.2 from 2008.
I have read that many hoses have to be replaced in the xkr including the valley hose and I do not know if this hose is present in the xk since I have to replace the thermostat housing and the thermostat I would like to know if the hose must also be changed of the valley in the assumption that the xk takes it.
Could someone inform me?

 

This should help you

Pic of the SC 4.2 - SC not shown. Hose #9 to the TB is the valley hose. 11 is the return.

Pic of N/A 4.2. No such hose in the diagram as the throttle body is up front on the N/A (Yellow and Pink lines in the diagram).

 

Thanks for solving my question.

 

if I may?...
i am replacing Header Tank, Valley Hose, Water Pump, Serpentine belt on my SC 4.2 - what else should i change while I'm at it?

 

Tha 4.2 N/A does not have the valley hose,but it does have the EGR return hose that goes down into the inlet manifold. Mine burst and over heated the engine. Luckily I escaped any engine damage. Definitely worth renewing for peace of mind .if you do a search on here I documented replacing mine.
Tommy.

 

Last summer I replaced all coolant hoses and manifolds including the thermostat and housing when my car was in under warranty for a S/C isolator change. My 2014 XKR only has about 19,000 miles. I hope I'm good for another 6 to 7 years without worry. I also changed the transmission fluid, ediff fluid and did a brake fluid change. The only other maintenance or problematic item I'm concerned about are the timing chain tensioners/guides. Although, based on my VIN my car has the upgraded thicker chain. I change my oil every 3 months or 1,500 miles to keep the lubricating holes free of contaminates.

 

Dump the oil out of your supercharger and replace it. You'll have it off anyway.

 

I have the 4.2 engine w / o SC, in an 2007 XK Convertible.

I have already replaced ( flushed ) Tranny and Differential oil. And replaced the spark plugs. Engine oil change every year is axiomatic.

Should I replace ALL water hoses? Complete cooling and heating system? Thermostat is advisable, I´ve heard, thermostat housing, too.

Water pump, too? I am reluctant to touch engine things that are running well, as a Jag expert, who looked at my car closely said: leave it alone.

I am thinking at buying ALL water hoses and parts dicussed ( how much do you think this will cost me? ), and then wait for the first failure or change in advance?

What do those with experiences in that matters say?

Thanks in advance, Hermann

 

Thank you, I have this in my plan and have the kit to do it.

 

All the extensive research I have done suggests may as well replace:
1. Water Pump - apparently they can/do fail from 50,000 miles
2. Expansion Tank - as above
3. Thermostat - as above

I paid not a lot for the above from Berkshire Jaguar in England- they get oem direct from the factory and save a fortune on buying from any Jag dealer - I'm sure they would ship to Austria
Two reasons I would do change this stuff:
1. The evidence is out there that you could end up with problems if you dont - I spent days searching the internet for this
2. If changing the Valley you are going to have access to this anyway, may as well kill it all in one go

 

Guys, wondered if someone would mind double-checking for me the "valley hoses". I believe these are the ones labelled as Hoses 9, 10 & 11 as shown in the diagram in post #2?
What I have been able to find that I think is correct are the following part numbers (for a 2009 XKR 4.2L S/C) :-
9. EGR Coolant Inlet HOSE AJ811062
10. Feed to throttle body AJ811063
11. Return from throttle body AJ811064.

I intend on doing a replacement of the "valley hoses" as I intend on keeping the car for another 10 years and want peace of mind. I will be doing both belts, accessory drive tensioner, pulley, thermostat, and water pumps. Obviously the coolant flush and refill.
Thanks in advance

 

Hi Sean,

Can you provide corrosponding part numbers for this diagram please?

I am in the process of getting all the parts for this repair on my 2009 4.2 Jaguar XKRS and I think my local indy garge would appreciate a diagram and where pipes are located etc...

This post was most useful

Thank you sir.

https://www.jaguarforums.com/forum/x...2023-a-266128/


AJ811064 – Block to EGR hose
AJ811063 – Throttle Body to EGR hose
AJ811062 – Block to Throttle body
AJ811638 – coolant manifold to block hose
AJ87246 – Upper EGR pipe gasket
AJ88560 – EGR to throttle body gasket
KSC137624 – Bypass valve housing to throttle elbow
C2C11477010 – Coolant manifold seal x2
AJ83292 – Supercharger to throttle body elbow gasket
NCC7735BA – Supercharger outlet seal
AJ86925 – Supercharger to charge cooler seals x2
C2C37055 – Supercharger drive belt
C2C37063 – Main engine drive belt
AJ89646 – Supercharger coolant filler seal

 

Is there a way tell if the valley hose has been changed by looking at it?

 

If you can look at it, you've already taken most of the engine apart already so may as well change it.

 

Who said anything about having the engine apart, I am asking if there is away to know if any previous owner has done this .

 

How do you propose on LOOKING at it WITHOUT the engine half apart? I'd really like to see that happen.

 

So I guess that is the answer, there is no way to tell on an intact engine.

 

X ray vision helps.
wj