weird noise

[Harry]

Hi guys, I have a weird noise coming from the front end. It sounsd like I might have done a bearing or something. The noise changes sound when I engage/disengage the aircon. I have looked under the bonnet and it sounds as if it is coming from the passengers side near the belts. The car still runs fine and if anything has lost a little power. Looking for idea's and whether this is going to be a big job.

[patch697]

What engine you running Harry???

[YNOT]

What engine you running Harry???

2004 ZD30, I had to go looking to find that.
Check the drive belt tensioner pulley bearing and belt tensioner strut for wear, common problems on ZD30 engines.

http://i758.photobucket.com/albums/xx224/tonyh01/P1010731-1.jpg
Also use a mirror to check the bushes on each end of the tensioner ram for wear as shown in second photo.

http://i758.photobucket.com/albums/xx224/tonyh01/P1010734-2.jpg

Tony

[Harry]

Thanks Ynot, I have a spare one of these on my trashed 2004 model. I had just removed it for my brother so will switch it over and give it a whirl. I'll be back hopefully with good news.

[Harry]

Do you know the piece the top hole of the piston bolts to, is this part of the block or can it also be removed? It looks as if it is part of the block but I'm not sure.

[YNOT]

Do you know the piece the top hole of the piston bolts to, is this part of the block or can it also be removed? It looks as if it is part of the block but I'm not sure.

It looks to be bolted on (in the first photo) so may be removable.

Tony

[Harry]

I changed over the drive belt tension pulley but the bloody noise is still there. It is still more prominant when the A/C is turned off and when I shut the truck down. I checked the bushes on the piston and they are both in good nick. It sounds like it is coming from the pulley below and slightly right of the piston. Any idea's??

[Yendor]

I would check the alternator pulley, they run a clutch type set up and are prone to failing.

Also check the air conditioning compressor pulley bearing, with the belt off it should spin freely by hand.

[Harry]

Cheers Yendor, The air cond pulley spins freely however makes a gritty noise. Is this hard to replace or do I have to replace the whole thing?

[Yendor]

The bearing is replaceable and apparently can be done without removing the compressor from the vehicle.

This saves having to re-gas the AC system.

Also if you are using a non genuine belt I would change this for a genuine belt.

[Harry]

I will tackle the bearing on Sunday. Any advice on whats required to change it out?

[Yendor]

Hi Harry,

1) Undo the bolt in the centre of the clutch plate on front of the A/C compressor (you can just see this in Tony first photo) the easiest way to do this is leave the drive belt on and supply power to the A/C compressor, this will engage the clutch and stop the compressor from turning.

2) Remove drive belt, now if you are lucky you can remove the clutch plate (not the pulley at this stage) with a bit of LIGHT prying with a couple of screw drivers (you do not want to bent or distort clutch plate) if this method doesn't work you will need to use a pulley puller, you should see three threaded holes in the clutch plate where you can connect your puller. Warning when removing clutch plate there may or may not be some shims behind it, don't loose these they will need to go back in when refitting.

3) Remove circlip, now once again if you are lucky you may be able to remove the A/C pulley and bearing by pulling it forward, if not then you will need to use a pulley puller again.

4) Once the pulley is off, turn it over and remove second circlip.

5) Press old bearing out and press in new bearing.

6) Refit in reverse order, make sure circlips are locked in place and don't forget shims.

Cheers Rodney

[Harry]

Thanks Rodney, I haven't had the chance to get to this yet and will be at work until Monday. Thanks again for the detailed instructions. I'll post again after I have completed the job

[Harry]

Well the job is finally complete and it worked out eventually. I snapped the bolt in the top piston for the belt tensioner when I was nearly done. What a nightmare and some how I found a spare on the Eylandt. The truck sounds new, I even fixed the winch. (new motor and grease) Thanks heaps for the great posts and pic's they definitely helped me through the process. I just want to point out that the 2000 GU has a different setup to the 2004 in regards to the support bracket for the compressor and belt tensioner piston bracket. The 2000 is a two piece and the 2004 is a one piece. I just thought I'd add this as this was the case for me and thought people might like to know. Thanks again to everyone

[Bushy-Au]

I am having similar noise problems. It is a squealing noise on start up and last a minute or so. Finally tracked it don to the belt tensioner. (I hope) The bushes look a little dodgy and the belt seams to be too loose, hence the noise. (I am guessing) I also noticed with the engine running the long sections of belt seem to be flapping a little. I am thinking or replacing the complete assembly and hoping the noise problem is fixed.

[threedogs]

x2 on the belt tensioner, not a big $$$$$ fix, also alternator pulley bearing it has a clutch, basically anything that spins, eliminate them one by one

[frenzy]

I got quoted $360 for a complete belt tensioner (including ram) from Nissan. They don't sell the pulley separately.

Removed the belt tensioner pulley and took it down to repco and got a replacement pulley and bearing for $60.

Didn't stop the noise though!!

Reckon it's the A/C pulley so will replace that next.

Good advice above Rod.

Cheers,

Steve

[frenzy]

This is the ZD30 belt config out of the parts book at Repco. Might be handy for someone.

18726

[macca86]

What is the bearing number for air con pully mine is shot

[BearGUST]

I recently did mine, just rang a bearing shop and gave them the number off the original bearing. As soon as I read it to him he asked if it was for an A/C compressor so must be fairly common.

[macca86]

My car is at mechanics suck of waiting for them sp I got the bearing 78 bucks ouch

[threedogs]

Heres what happens to your alternator, no noise at all, small squeak when stopped at camp touch the throtlle it went away.
consensus was to continue, no warning Bang stop Tilt tray

[macca86]

Put a new one if them in 3 months ago as well as ideler pully as that seized too now its the air on pully. Lesson learnt no more mud puddles