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Air Con Pulley Dropped Off!


Nackuk

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24172114393_17417aa126_z.jpgIMG_20160203_184532 by Nackuk ., on Flickr

 

Tonight on the way home I got a horrible sound from the engine bay. At first I thought the alternator pulley had given up. But when I opened the bonnet it appears the aircon pulley, the front part has come off, and lucky just span around in situ grinding on the main front beam, thankgod.

 

Has anyone had this before, and what can be done to fix it or the parts needed. Please any advise would be appreciated before I start taking her apart.

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huh...this was lucky..in some way

 

did you had any noise prior to this event? and if how long? .. that would give you any warning or it was sudden?

i believe i am hearing some noise in that part and i just might end like you...

sorry that i can not be of any help  ... but i sure will be thankful for any advice as well

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Is it the pulley on the tensioner, or the pulley on the compressor? I changed my tensioner about 50k miles ago as it was a bit rattly. When I took the old one out there was quite a lot of play in the tensioner pulley.

The tensioner is cheap (about £20 I recall) and just held on / set with two bolts, access is a bit painful without being in service position.

Edited by jimbof
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It is the pulley on the compressor (not the tensioner pulley). I guess the clutch mechanism on it has given in? Not sure until I get the time to look though.

 

Yeah it was noisy when it failed as in the last journey, when it dropped off while it was grinding on the front tube. Kind of lucky as it could have picked up on the belt and spun through the radiator or other item.

 

I suppose the worse scenario here is a new or second hand compressor?

 

It has done 40K miles since the belt was changed (last cam belt replacement time) and I had tensioned it up.

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Some designs of aircon compressor (e.g. Mk1 Fabia, same era as your car) have a rubber coupling between the compressor shaft and the pulley that is designed to shear off if the compressor encounters excess resistance to pumping, e.g. it gets liquid refrigerant to try to compress instead of gaseous phase.  If yours is this type, this coupling is probably what's failed. Inspection of the detached part may confirm. Not repairable except with replacement compressor AFAIK.

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  • 4 weeks later...

So I finally got round to looking at this and getting the car running again. The center bolt had come out of the pulley, due to bearing wear in the clutch. Compressor spins fine by hand (via the shaft - not the clutch)

 

Tried to look for a new clutch for the DENSO unit 80DO 260 805 J without success. So in the end got a second hand compressor for £35. Took the clutch off and put it on the existing compressor. Job was surprisingly easy. Of course the second hand clutch has probably done as many miles as the broken one.

 

Any it works again and its nice to have her back on the road.

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I was lucky the splines ground off the pulley and not the shaft.

 

It was only noisy after it came off and started grinding the air tube. Luckily this is okay.

 

I did not shim the clutch up. I put it back together as I found. Please can you explain further.

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