Rb25det Rattle

[defari]

Standard 25det gearbox. Starting to get a rattle from the gearbox. I did change the gearbox oil about 3000km ago, no leaks/wetness. Any ideas? A mate says its the turbo but it holds 10psi fine, no smoke or R&R.

video

[mad082]

does it go away when you push the clutch in?

[defari]

it does.. I am having a few clutch problems at the moment.. doesnt fully engage/disengage (i.e clutch flat to floor in first gear, take foot off brake, the car starts creeping forward ever so slightly)

[jrm]

If it goes away when you put the clutch in, my money would be on the standard RB25 input shaft bearing noise.

The other common noise is when you have a whining noise that goes away when you go into 4th gear, apparently this is the cluster shaft bearing.

From what I've seen/heard, it's common as muck.

[mad082]

yeah that is the common rattle if it goes away with pushing the clutch in. mine had it. usually caused by having a heavy duty clutch as you have extra stress on the bearing everytime you push the clutch in. when you push the clutch in the bearing presses against the pressure plate to let the clutch plate free from the flywheel, and since there is pressure on the bearing it goes quiet. the rattle when the clutch is out is because the bearing rattles from not having any pressure to hold it still. like having a loose nut or bolt. when you tighten it up it can't vibrate and make a noise.

however if you are having issues with the clutch never fully disengaging then it may be a result of that as well and may be partially related. the creeping in gear can be caused by 1 of 2 things. 1: adjustment. 2: damaged pivot bolt of clutch fork. there is a 3rd possibility but it is generally much less common. that is the clutch fork not holding the bearing properly. unfortunately both 2 and 3 are gearbox out jobs.

[defari]

i havent had a proper look at the clutch nor driven a 33 with a stock clutch but it definitely feels aftermarket.. it is very heavy but i have to put my foot to the floor to engage/disengage it. Ill have to get it checked out properly but yeah the noise goes away after 5-10 mins or whenever the clutch is in.