So i recently signed up to the jaguar forums to see if i could get some input from one of you members, my xj6 recently overheated one night i figured it has something small so left it sitting at a friends house, the next day i go over to see if i could figure out the problem when i check no busted lines, replaced thermostat, i then noticed my water pump and air injection pump wasnt spinning so i replaced the water pump, and still no spin on either nor the fan. Can someone please help me out here, i need to know if the air injection pump is what makes the water pump and fan spin, and how could i check if the pump is bad cause i dont want to replace it and then its a blown fuse thats not letting electicity get to the air pump.

 

Forgot to mention its a 1987 xj6 4.2l

 

Hi,

As I recall the Air Injection Pump is on it's own belt and shouldn't have anything to do with the water pump or overheating.

I not quite sure if I'm following you correctly but it sounds like you need a water pump belt...

Cheers
DD

 

I would have thought is is fairly easy to see if a drive belt is missing, after all there is a large pulley on the water pump and the alternator. Of course, the belt could be slack and not driving, OR the pump has seized, although this is very rare in my experience.

I had a slack belt on a small Austin 1100 in my poor (lack of cash) youth, and nearly didn't get home as the battery almost went flat before I noticed the slack belt

 

The motor has 2 different pulleys one the crank and the other the water pump, the air injections belt is attached to the water pump one, the water pump one also control the powersteering one which was once ripped and i havent replaced since because the line is pinched and leaking, the crank as far as i know is only attached to the alternator, i just cant seem to figure out what spins the water pump

 

I think i might have figured out the problem, do any of you know if the xj6 holds a v belt from the water pump to crank to powersteering?

 

Its a long time since I had an XJ6 with the XK 4.2 engine, but I remember one of the belts drove the waterpump/radiator fan, and the alternator. So it went around 3 pulleys - crank, waterpump/fan, and alternator.

Haved a read of this, and also look at the pictures; you will clearly see the belt I describe.

 

Sorry, forgot to add the web reference

The Jaguar XK engine - by Roger Bywater

 

thanks for the reference, i found a picture of a engine being removed for replacement of and ls1 and noticed the all the belts and how they go.

 

My xj6 is missing the v belt to the far left, i cannot believe i missed that, thanks for the help people

 

Loks like you have it sorted. Sorry I seem to have got the belts layout wrong, but the UK cars seem very different in this area to the US ones, (as in simpler !).