What did you do to your XJ today? 1M Views

[sbadman]

Originally Posted by rustynuts

Some radiator caps don't fit. I put a new one on my new radiator and it bled into the overflow tank when hot. Mentioned this to Wooders and he said it was "because it wasn't one of his." Installed one of his and presto...all good.

My original cap caused much the same issue, ended up replacing it with the one from the parts car and sorted all my overheating problems once and for all.

[Richard buttocks]

Originally Posted by Roler

What's that we're looking at? Something around the rocker cover? Jeez man, you start to have as much shite with the Xj as AG by now....

Correct on all counts.

[Roler]

Originally Posted by rustynuts

Some radiator caps don't fit. I put a new one on my new radiator and it bled into the overflow tank when hot. Mentioned this to Wooders and he said it was "because it wasn't one of his." Installed one of his and presto...all good.

I have some trouble working out how that would work. As far as I can imagine, a non fitting raditor cap will loose pressure and if anything will loose coolant around the cap...? Endng up in the overflow tank would be the (expanding) coolant that could go nowhere else....but you state his cap fixed it, so I must be missing something here.

[sbadman]

The pressure in the cooling system keeps the boiling point up. If the pressure drops due to a failing radiator cap the boiling point drops and the coolant turns to steam, which doesn't remove the heat from the engine as effectively.

[layback40]

Originally Posted by wikchi

It doesnt want to start AT ALL while hot, i had to leave it about 30 min before it came under 100 temp according to the dash then it fired right up.

Need to work on the cooling system as it doesnt seem to be working right as it spits it out the overflow/filler tank and leaves it dry or close to, thermostat and water pump time?

Crank position sensor on way out?

[wikchi]

sorry its a 96 sport auto

[rustynuts]

Originally Posted by Roler

I have some trouble working out how that would work. As far as I can imagine, a non fitting raditor cap will loose pressure and if anything will loose coolant around the cap...? Endng up in the overflow tank would be the (expanding) coolant that could go nowhere else....but you state his cap fixed it, so I must be missing something here.

Wooders cap looked to have a longer spring on the shaft that seated the rubber washer into the filler neck better. The top seal on mine was fine so it was loosing pressure into the overflow hose.
I recall people having problems previously with some generic caps.