Looking for a little guidance, I have a 2011 XJL. There is a leak coming from behind the water pump. I have replaced it, yet there is still a leak. I'm not sure what to look into next, when I was talking to the parts guy at Jaguar he mentioned the crossover tube. I tried a borescope to look behind the pump but, couldnt I still couldnt see where the leak was coming from. Has anyone replaced the tube, how big of a job is it?

 

Bme, the tube in question is for the oil cooler that sits in the V of the engine. There is a short little tube that connects the back of the water pump to the cooler. There are 2 O-rings on this and if they are not seated just so, they will leak on you. I fought these when I replaced my water pump. I ended up pulling the intake off of my engine to be able to look down in there and make sure that all things are properly aligned as I put things back together.

When putting things back together, you need to keep the water pump parallel to the engine and then you also need to make sure that this tube is orientated correctly. Once you have the water pump off, you can temporarily connect the tube to the water pump and see how it should be orientated. take your time and all will go just fine.

 

Thermo, thanks for the reply, I guess I'll try my hand at it again. I have actually replaced the o-rings thinking that those were the issue. I'll try removing the intake and see where that goes.

 

Bme, I would say to pull the intake and then remake up the coolant hoses. I would then find a local auto parts store that rents tools (normally they are free with an initial deposit that you get back once the tool is returned). You can then remove the cap off of the coolant reservoir and press up the system to say 15 psi. This should allow you to see where the leak is and not have to pull too much apart before having a better idea of where the leak is coming from. The other possibility is the oil cooler. But, I would find that hard to believe that it would start leaking on you with how it is sealed and held in place.