Belt Cluttering/chruning Noise

[EVL-R33]

I recently got some head work done to my R33 and after driving it around for about a week now, i started hearing like a cluttering\churning noise coming from either the belts or inside the motor. The noise is there while the car is on and gets a little louder when going over bumps, but is most noticeable when turning the car off ass the belts stop turning..

what could this be? im not sure as to exactly where its coming from..

PS. apparently my timing belt was a little loose when my mechanic took the head off, and he tightened it up, is it possible to over tighten the timing belt which could cause problems or not? when i start my car it sounds a little like a supercharger, forced sound, and it didnt sound like this before..

any help would be appreciated.

Cheers.

[(B1) MR_fanny]

take it back to the mech to sort it out? whirring sound could be over tightened timing belt? the cluttering sound you describe sounds a whole lot worse....well in my dictionary anyways.

[PUDZ 32R]

sounds like your timing belt tensioner is screwed mate. probably as a result of being over tightened by the mech. GET IT FIXED ASAP as the RB series engines (aside from RB30) are interference engines i.e. if the timing belt breaks or slips a tooth etc the valves will smash into the pistons causing you a 10k repair bill.. hope this helps. By the way it is really easy to check/ change the timing belt by yourself. took me about 45 mins to change the belt on my R32. i cant stress enough to get this fixed.

[EVL-R33]

sounds like your timing belt tensioner is screwed mate. probably as a result of being over tightened by the mech. GET IT FIXED ASAP as the RB series engines (aside from RB30) are interference engines i.e. if the timing belt breaks or slips a tooth etc the valves will smash into the pistons causing you a 10k repair bill.. hope this helps. By the way it is really easy to check/ change the timing belt by yourself. took me about 45 mins to change the belt on my R32. i cant stress enough to get this fixed.

when the belt was off, he mentioned that the idler looked a bit suspect, (he didnt say anything about the tensioner) the idler looked like it had a few scratches on it, and it didnt spin as freely as he thought it should...

and fair enough this could be the result of the whirring/forced sound, but what about the cluttering that happens every now and then when i turn the car off, could this be the same problem or something else?

i might have to try get the belt off myself and take a proper look, ive never done this before, so i might have to look up some DIY info before i attempt it...

[Fry_33]

Get in there and check it out or get your mechanic to do it. As soon as a belt snaps most people will generally go straight to the belt manufacturer to say 'your belt broke'. I would say the majority of the time timing belt failures will be due to installation issues. If the belt snaps and you haven't replaced all of the idlers and tensioners then the they won't even consider covering it as they recommend replacing all idlers etc with the belt.

If your tensioner was noted to be not spinning 'as freely as it should' then you mechanic should have really reccommended you change it. If it stops spinning then the back of the belt is running over a stationary idler. This generates a lot of heat and once a rubber belt is exposed to that for a long enough period it stops being as flexible (heated rubber eventually hardens) and will lead to a failure.

[PUDZ 32R]

i would say get the idler and tensioner bearings changed.. should be able to get some from a bearing joint and press them in.. have you checked your fan? because my fan went recently (very suddenly) and was making a clunking cluttering noise when the engine was turned off. try and wobble the blades and see if they have any back and fowards movement. it may just be a big coincidence that the fan has went and making this noise. just another thing to check.. you need to get the bearings replaced. by a DIFFERENT mech mate. the one you took it to doesnt sound like he knows much about skylines.. not insisting you change the bearings that are shot is like pouring water in the motor and waiting for death.