Yet another problem has surfaced on my 2.5 TD....
Just lately, the auxiliary belt tensioner has a habit of un-tensioning itself, usually when the engine is switched off. A firm tug on it brings it back into place, and it's fine when running normally. My car has a habit of stalling when cold, and the engine suddenly stopping under load usually triggers the fault. When the engine stops, there is also a horrible screech that seems to come from the tensioner assembly.
This was never a problem until I changed the water pump a couple of weeks ago. During this procedure, I used a big bar to release the tension against the spring so I could get the belt off.
Have I broken the tensioner or have I missed something? There is a recess on the front of the tensioner pulley which I have a correct sized tool for, I've tried doing this up tight or leaving it slack, and it seems to make no difference to the fault. When driving normally, it is fine and the tensioner stays against the spring.
Any ideas on what might be wrong?