Help with Mba pulley on ac compressor - Chevy Impala SS Forum
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post #1 of 11 (permalink) Old 12-18-2016, 01:40 PM Thread Starter
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Help with Mba pulley on ac compressor

Installed these last xmas and been in hospital for months just got home and started the car to let it run and the belt started smoking the ac was freezing cold as always but when I removed the belt the compressor will not free spin it's locked in place

I want to have my friend remove the Mba Ac billet pulley but not sure how it went on or off due to brain cancer my buddy removed the 3 Allen key screws and it won't move any help would be great

All other pulley move freely with the billet pulley so has to be the compressor locking up it is new well 18 month old Delphi but only 90 miles mostly back and forth to Dyno and driving at track

Bigb9000 is a scammer, you owe me 3 MAP plugs
1996 ss BBB 72k 150 db faSSt see build
1996 ss BBB 182k new crate at 182k
1999 Camaro 38k
1983 Oldsmobile cutlass t-top h/o 350 vortec th350
2014 Traverse wifey truck 4 TVs and wireless headphones.
2012 yamaha vxs
2001 pro sport 21' center console

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post #2 of 11 (permalink) Old 12-19-2016, 06:30 AM
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I have the same cover and may have instructions somewhere if that would help. I'd have to try and find them but IIRC, there is a double sided threaded fitting that threads into the center of the Compressor Clutch. Then the Cover itself threads onto the Fitting and believe it just spins on CW. Once the cover is threaded onto the fitting, you use the 3 Set screws to lock it into place on the Clutch.

Once the 3 set screws are removed, you should be able to grab the outer edge Pulley Cover and un-thread it from the Fitting and spin the cover off. Once the cover is removed, you should still see the Threaded Fitting installed in the Compressor Clutch which I believe is "lock-tited" into place when you install. Mine is currently off the car and I could get some pics for you if I can't find instructions and you still need them.

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'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #3 of 11 (permalink) Old 12-19-2016, 08:28 AM Thread Starter
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Yes please I removed the 3 screws and the clutch is locked in placed but I can't get the pulley off my buddy tried spinning both ways it's on there tight so it's screwed on to a fitting

I can't remember was a few brain surgeries ago


If I lock tight on how could I get it off my friend could find anything to grab onto or even to hit with a screwdriver to get it off
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post #4 of 11 (permalink) Old 12-19-2016, 10:42 AM
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would a strap wrench work?

\'96 BBB 383/T-56
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post #5 of 11 (permalink) Old 12-19-2016, 02:32 PM
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Quote:
Originally Posted by lt1ssb View Post
Installed these last xmas and been in hospital for months just got home and started the car to let it run and the belt started smoking the ac was freezing cold as always but when I removed the belt the compressor will not free spin it's locked in place

I want to have my friend remove the Mba Ac billet pulley but not sure how it went on or off due to brain cancer my buddy removed the 3 Allen key screws and it won't move any help would be great

All other pulley move freely with the billet pulley so has to be the compressor locking up it is new well 18 month old Delphi but only 90 miles mostly back and forth to Dyno and driving at track
the ac compressors can lock up if the liquid refrigerant gets drawn into the compressor valves when it sits and then turns into a liquid. The compressor will then be hydo locked.

using a heat gun or hair dryer on the compressor body or operating the vehicle with no ac on will get the liquid to change over to vapor then it should move also may be too much refrigerant in it .

lack of oil in the ac system will cause the compressor to lock up when it was already operating. that did happen to me . the compressor body seals OEM original slowly leaked out the oil . then one day ac on the compressor suddenly locked up ..

had to do the complete flush/compressor change out still good for about 3 yrs now... did take a while to get all the gray debris out by using a flush product and the air compressor. the low pressure switch if shorted out will also cause this lock up.
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post #6 of 11 (permalink) Old 12-19-2016, 07:16 PM
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Quote:
Originally Posted by BALLSS View Post
would a strap wrench work?
Exactly what I was thinking with a rubber strap that won't mess up the anodized finish. Those things grip pretty tight too and just need to keep the compressor from moving. If he doesn't have a strap wrench (pretty cheap at harbor freight) and the compressor is off, you may be able to grab it with your hands and spin it off.

Quote:
Originally Posted by lt1ssb View Post
Yes please I removed the 3 screws and the clutch is locked in placed but I can't get the pulley off my buddy tried spinning both ways it's on there tight so it's screwed on to a fitting

I can't remember was a few brain surgeries ago


If I lock tight on how could I get it off my friend could find anything to grab onto or even to hit with a screwdriver to get it off
There doesn't seem to be many people here who have the MBA ac pulley cover. I had a post back in 2012 where I was asking how to install it. I have the instructions somewhere and couldn't find them in a quick search but they were real basic IIRC.

I found this old thread for you and guy was having the same issue....

https://www.impalassforum.com/vBullet...cover-mba.html

If it would help you, I could look a little more for the instructions. I just never mounted mine cause I wasn't comfortable with how it fit and just put it away. I do have pictures of the pulley cover if it would help. Can't load up til tomorrow but let me know if you still need some pics and I'll be glad to post them for you.

I did look at the pulley and there is a Double sided thread adapter that is reverse thread on 1 end and normal thread on the other end. I believe the standard thread goes into the compressor clutch and then the pulley goes onto the other Reverse thread side. Hopefully that helps, let me know.

Just as a btw - I need to replace my compressor and the replacemnt has a slightly different clutch. So I may have to find a different way/adapter to work with the new compressor. If you are replacing yours, keep this in mind cause I think the more expensive GM Compressors STILL use the same clutch that would work without issue.....except years later when you need to remove again.

================================================== =============


'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #7 of 11 (permalink) Old 12-20-2016, 06:16 AM
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Here's some pics of my pulley...maybe they'll help. You can see the Double Threaded adapter in the backside of the pulley. Keep in mind that the Steel Adapter (little rust in my picture) could seize itself to the Aluminum Pulley. So take care trying to remove the adapter from the pulley.

I sprayed some penetrant on it last night and will try to get it later. Thought it had 6 sided center to it that I could get a socket on but may have to try and grip the threads somehow to remove the adapter. If I do, I'll follow up with a picture of the adapter and how it removed but almost 100% positive its a reverse thread.




================================================== =============


'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #8 of 11 (permalink) Old 12-22-2016, 11:49 PM Thread Starter
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That's a great idea will get a rubber one the cloth type one wouldn't work thanks for this suggestion

Bigb9000 is a scammer, you owe me 3 MAP plugs
1996 ss BBB 72k 150 db faSSt see build
1996 ss BBB 182k new crate at 182k
1999 Camaro 38k
1983 Oldsmobile cutlass t-top h/o 350 vortec th350
2014 Traverse wifey truck 4 TVs and wireless headphones.
2012 yamaha vxs
2001 pro sport 21' center console

All are for sale except the boat and the beast SS
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post #9 of 11 (permalink) Old 12-22-2016, 11:52 PM Thread Starter
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Thanks mine is being a bitch lol we tried the strap wrench didn't work gonna try the heat gun this weekend to see if we can reconvert the liquid over

Was reading the fsm to test the low pressure switch out
Freon levels are good on gauges he brought by



Bob just sent the instructions I asked for the others too just to add them on here for all the Mba pullers for future forum use

Bigb9000 is a scammer, you owe me 3 MAP plugs
1996 ss BBB 72k 150 db faSSt see build
1996 ss BBB 182k new crate at 182k
1999 Camaro 38k
1983 Oldsmobile cutlass t-top h/o 350 vortec th350
2014 Traverse wifey truck 4 TVs and wireless headphones.
2012 yamaha vxs
2001 pro sport 21' center console

All are for sale except the boat and the beast SS
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post #10 of 11 (permalink) Old 12-23-2016, 12:13 PM
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Quote:
Originally Posted by lt1ssb View Post
Thanks mine is being a bitch lol we tried the strap wrench didn't work gonna try the heat gun this weekend to see if we can reconvert the liquid over
IDK if those pulley covers are reverse thread...were you trying to remove it by just counter clock wise??

might want to try with the strap wrench both directions

\'96 BBB 383/T-56
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