Recurring problem with gearbox

My gearbox started making a a grinding/whining noise when the clutch pedal is not pressed. So I got it checked out and gone over by gearbox specialist becuase it needed a new clutch anyway. So the noise went away but it has come back….tried a new clutch release bearing but the noise is still there.

The gearbox guys have suggested that the pushrod is not running true and has probably damaged the pushrod push thus causing the noise. This would make sense as the bush was damaged and replaced when they had it out… probable causing the original noise. The gearbox guys will sort the gearbox for free but I still have to pay a seperate garage to remove it.

What I want to know is how do stop this happening again? The clutch was replaced but they suggested that maybe the original cause of the misaligned pushrod could still be on the engine….what could it be?

Don't understand why they think there is an engine issue as these reverse clutch's don't centre in an engine bush.
You say they replaced the brass bush in the spigot shaft, when you get the box removed you will be able to test the pushrod for running true (lift the clutch lever up and the rod will move forward) - it can only be either the bush not being positioned down to it's 'stop' and thus not centering the rod or the pushrod being bent. Still sounds like a release bearing, are these new or re-con parts?

The release bearing was brand new and didn't make a any difference to the sound…does it need to be pre-oiled?… I installed it and I didn't oil it up prior to installation. Is it possible that the pushrod could make this kind of noise? You an actually alter the pitch of the noise with depending on how far you press the accelerator down….all the way down and it goes away completely. The noise also gets higher with the revs.

No don't put oil anywhere near the clutch - is the noise there when stationary, what happens if you depress the clutch pedal, is the noise still there?

The release bearing is at the other end of the gearbox away from the clutch??? The noise complete goes when the clutch is fully depressed.

Yes it is, you access it through a small 'hatch' cover but still shouldn't need pre-lubricating . Have you checked the box oil level is correct? Remember even although the oil runs from the drain hole the 020 needs another 1/2 litre added through the speedo to fill properly <87, total 2.0l .

OK…I'll check the oil and get back to you.

sounds like trust bearing to me

that or the gearbox has somthing floating around in it id drain the oil and see if any metal drops out :wink:

So I filled the gearbox up, only took about 200-300ml so it wasn't too low. The noise is still there so I'm gonna take it to the gearbox guys later today…great more money to get a garage to take it out again  

Anyway….what do I need to ensure is double checked?

Pushrods straight
pushrod bush

What else?