Aircon Compressor Pulley bearing replacement?

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Aircon Compressor Pulley bearing replacement?

Post by GTO »

My 2700i started making an intermittent grinding noise today which I traced it to the AC compressor, the noise happens when aircon is off and clutch is disengaged.

Clutch also inches slightly forward sometimes, turning the clutch by hand a slight grinding noise can be heard.

I checked online and it seems that its the pulley bearing that’s shot, I removed the belt and the pulley is very loose and doesn't spin much.

Has anyone replaced this?

Here is a pretty good link on replacing it on a 4runner:

https://www.toyota-4runner.org/3rd-gen- ... ement.html
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Re: Aircon Compressor Pulley bearing replacement?

Post by Mud Dog »

Here's a thread where Cassie did it on his 1995 SFA .... https://www.hilux4x4.co.za/views/viewto ... ing#p50432

Won't be the same compressor unit as your model but the procedure should be similar. :winkx:
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

Mud Dog wrote: Wed Apr 10, 2019 5:38 am Here's a thread where Cassie did it on his 1995 SFA .... https://www.hilux4x4.co.za/views/viewto ... ing#p50432

Won't be the same compressor unit as your model but the procedure should be similar. :winkx:
Thanks, I see he removed the compressor from its mounts, I saw a guy do that in a youtube video last night, its definitely the bearing its making the exact same noise as the one in the video.

Makes sense as there isn't much room to work with it in place.

Its getting the clutch bolt loose which might be an issue, they used an impact wrench my father has one so will probably to it at his place.
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

I will change the idler pulley bearing as well its seems slightly rough.
I presume its a different bearing to the power steering one mentioned in this article:

https://www.hilux4x4.co.za/replace-tens ... /index.php

As its a different Toyota part no?

When I get the bearings I will get one for the power steering idler pulley as well.
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

Here is the PDF of Toyota manual disassembly of pulley, note remark about snap ring.
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Re: Aircon Compressor Pulley bearing replacement?

Post by Mud Dog »

I'm not familiar with the 3RZ 2.7 and I might be mistaken, but I seem to recall a thread here that said that the tensioner pulley bearings were not replaceable and that it had to be replaced as a unit only available from the agents .... and if memory serves me well there was a post from someone that had managed to remove and replace just the bearing on the assembly at a fraction of the cost of the complete unit. Worth doing a search.
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

Mud Dog wrote: Wed Apr 10, 2019 8:35 am I'm not familiar with the 3RZ 2.7 and I might be mistaken, but I seem to recall a thread here that said that the tensioner pulley bearings were not replaceable and that it had to be replaced as a unit only available from the agents .... and if memory serves me well there was a post from someone that had managed to remove and replace just the bearing on the assembly at a fraction of the cost of the complete unit. Worth doing a search.
That's the link I posted above from Pieter Pretorius
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Re: Aircon Compressor Pulley bearing replacement?

Post by Mud Dog »

:thumbup: I didn't open it, so I didn't know. My bad. :winkx: .
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Re: Aircon Compressor Pulley bearing replacement?

Post by pietpetoors »

Stephan I had the issue with my aircon this year. It is very easy to replace the bearing. That bolt should not be difficult to get off, an impact wrench will help but It mine of just with a little impact from the palm of my hand on the wrench.
Grinding noise most probably from the clutch which is worn and you might to replace the clutch assembly as well.

Aircon tensioner is the same as the powersteering tensioner and you will be able to replace the bearing in the same way as in my article.
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

I got it all off last night clutch bolt was easy I just held the clutch with an oil filter chain wrench, snap ring wasn't easy, I tried without dismounting the compressor but its impossible to see the holes on the snap ring.
So I dismounted the compressor tilted it upwards and then I could get the snap ring off.
The pulley would not budge so I had to use a puller.
Like you said I see the bearings in both tensioners are the same, the bearing in the pulley is identical to the one mentioned in the link I posted to the 4runner forum.
The pulley bearing is stuffed I can hardly turn it.
Tensioner isn't so bad.
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

Bearing Man don't do this particular bearing,went to few different places eventually was told to go to Zhous Enterprises they are the agents for Nachi bearings no stock in CT has to come from JHB will get it early next week, R 115.
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Re: Aircon Compressor Pulley bearing replacement?

Post by pietpetoors »

Got mine from Bearing distributors in Vredenburg and I think they also ordered from JHB.
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Re: Aircon Compressor Pulley bearing replacement?

Post by pietpetoors »

Where the ID of the bearing slides over the alu casing of the aircon, check for play there. If the bearing is stuck it tends to eat away the alu in which case the new bearing will not fit loosely. The aircon guy around the corner from me recons that when the bearing turns on the casing you need a new pump, but I am sure a boer can make a plan. Ons shafts I normally hit small indentations with a centre punch so the bearing can fit tight, not sure if it will work on the alu casing.
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

pietpetoors wrote: Thu Apr 11, 2019 8:33 pm Where the ID of the bearing slides over the alu casing of the aircon, check for play there. If the bearing is stuck it tends to eat away the alu in which case the new bearing will not fit loosely. The aircon guy around the corner from me recons that when the bearing turns on the casing you need a new pump, but I am sure a boer can make a plan. Ons shafts I normally hit small indentations with a centre punch so the bearing can fit tight, not sure if it will work on the alu casing.
Thanks will check that out, the inside of the bearing has some scrape marks was going to clean up alu side with fine sand paper.

The bearing was difficult to get off I had to use a puller, would that mean the alu side is still good?
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Re: Aircon Compressor Pulley bearing replacement?

Post by Mars »

Yes it probably means the aluminium is still good. Don't remove any of the aluminium by sanding it.
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

Mars wrote: Fri Apr 12, 2019 6:56 am Yes it probably means the aluminium is still good. Don't remove any of the aluminium by sanding it.
Thanks, what about applying some loctite around the aluminum shaft when assembling?
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Re: Aircon Compressor Pulley bearing replacement?

Post by Mud Dog »

If you ever need to get it off after that, you're gonna battle big time. :D:
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Re: Aircon Compressor Pulley bearing replacement?

Post by Mud Dog »

Rather just do as Pieter suggested and put 3 or 4 pops on the shaft with a centre punch if you feel that the fit is too loose. :winkx:
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Re: Aircon Compressor Pulley bearing replacement?

Post by pietpetoors »

Depends on how loose it is. If the casing is worn much with very loose fit I doubt if loctite will hold it, the notches works better. If it is just loose with almost no play loctite will be good. If the casing is not damaged you can either just put it back as is or for safety apply some loctite if you want.
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

Pulley was very loose when still attached, but like I said was very tight on the shaft.

Bearing was rough but then I sprayed it with brake cleaner to clean and it seized up and was not easy to free up by hand, now it turns but not easily.
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

How would you hit it back onto the shaft, with a large socket on the pulley?

Not sure I have a socket that will fit over the dust shield.
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

This looks like the Loctite to use if its worn:

https://www.henkel-adhesives.com/es/en/ ... e_660.html
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Re: Aircon Compressor Pulley bearing replacement?

Post by pietpetoors »

Lyk reg ja
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

Bearing has definitely turned on the shaft but there doesn’t seem to be a ridge and it still measures 30mm.
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

I got the bearing and the Loctite 660 today, Loctite was R 560! :cry:
Fitting bearing to pulley was easy using my vice with a block of wood that I cut a hole out off with a hole saw to go on the outside of the pulley around the dust cover and the old bearing on top of new , turned the vice in and it went in pretty easily.
The it came to fitting the pulley to the shaft, I was trying to figure out how I would hit the pulley onto the shaft, so I placed the pulley in position to check and it just fell into place! :o:
So the shaft is pretty worn, I checked old bearing on shaft but it was tight, but it has been shimmed with aluminium!
Any way I popped the shaft as best as I could with a center punch and put the Loctite on the bearing and the shaft and the pulley wouldn't go in easily(good sign?) so hit it on with a rubber mallet.
I installed the clutch, but I see the gap varies like before in one spot the gap is less than the rest but I can get a thinner feeler gauge in almost like either the pulley or the clutch is warped?
I remounted the compressor but I am leaving it till tomorrow night to test, I want to rather let the Loctite cure properly.
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

Last night I installed belt, it works but gap issue on clutch seemed to an issue as clutch inches forward slowly when disengaged, so I added a thin extra washer and now its fine.
But what worries me is gap is larger than than 0.6mm specs but compressor works fine?
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Re: Aircon Compressor Pulley bearing replacement?

Post by Mud Dog »

Never had to do one of these so not sure what mechanical / electro-magnetic forces are possibly pushing the clutch forward. Just wonder if it affects the area of brake surface being utilised when too far forward.

How much more forward is it than the 0.6mm spec?
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Re: Aircon Compressor Pulley bearing replacement?

Post by GTO »

0.8mm to 1mm and then at the bottom 0.2mm
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Re: Aircon Compressor Pulley bearing replacement?

Post by Mud Dog »

:shock2:

Doesn't sound very good but other than puling it apart again to find out why you could run it like that for a while and see what happens. :scratch:
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