1977 A/C balancer?
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Senior User
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From: Las vegas, Nevada.
1977 A/C balancer?
Hello, 1977 f-150 302 with A/C. When the A/C is operating the truck has quite a shake to it. If you look at the compressor you can see the belt vibrating quite a bit. The belt is tight like it should be. On a recent trip to the pic a part I noticed that the other compressors had what seemed to be a balancer mounted onto the pulley. Is this required to stop the shake and vibrating belt? If so does it simply come off with the pulley. The compressor on my truck looks just like the ones at the pic a part, the only difference is that mine has no balancer, it is a remanufactured one.
Thanks.
Thanks.
New User
Joined: Jan 2008
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Can you post a pic of it in your gallery?
I can then compare it to another.
Btw,
I noticed you used upper case in your Bronco II album in your write-up.
May I suggest changing it to lower case to make it easier for some of us to read ?
I can then compare it to another.
Btw,
I noticed you used upper case in your Bronco II album in your write-up.
May I suggest changing it to lower case to make it easier for some of us to read ?
Postmaster
Joined: Apr 2000
Posts: 2,881
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From: North of Tulsa, Oklahoma
You might have a warped internal rubber damper. If you can take the belt off and try spinning the a/c clutch by hand and watch it from the side view to see if it looks like an out of round revolution. That should be a quick and easy fix. Good luck with whatever the cause is.
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Senior User
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From: Las vegas, Nevada.
OK, I put a picture in there under my 77. if you look right behind where the belt is all of the others that i saw had quite a large balancer there, or at least it looked like one.
Cargo Master
Joined: Sep 2005
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there is no balancer on an a/c compressor. It could be an out of round or bent pulley anywhere on the engine, the A/C draws a lot of power so any imperfection in the belting could cause the vibration even if it isn't A/C related. Also check to make sure none of the A/C brackets are loose or cracked and make sure they are all there, most of the trucks had a bracket to the top of the compressor and I've seen alot of them discarded.
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Senior User
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From: Las vegas, Nevada.
no thats not true, there is some type of a balancer on the other trucks at the pic a part. if you look at a normal compressor then you are correct, there is no balancer. however if you look at this style there is a large steel or cast peice that sits on the rear of the pulley, it is actualy much bigger around then the pulley. about twice the size. it has got to be a balancer, why eles would a big peice of metal be there? i will try to find a picture of one so you guys can see what i'm talking about.
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From: Las vegas, Nevada.
ok, I posted two pics of the compressors with what appears to be a balancer, they are in my gallery under my 1977 f150
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Cargo Master
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Originally Posted by turborich
no thats not true, there is some type of a balancer on the other trucks at the pic a part. if you look at a normal compressor then you are correct, there is no balancer. however if you look at this style there is a large steel or cast peice that sits on the rear of the pulley, it is actualy much bigger around then the pulley. about twice the size. it has got to be a balancer, why eles would a big peice of metal be there? i will try to find a picture of one so you guys can see what i'm talking about.
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Senior User
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From: Las vegas, Nevada.
ok then, thanks for the info... now please tell me what that actually does? I have noticed that the peice we are talking about is on all of the origional a/c compressors at the pic a part, and also on the old f150's on ebay. it must serve a purpose if it's there, correct? my truck does not have one on it. should I be concerned about getting one? it looks like the same compressor and pulley, even has a place where this part looks as if it should go. does anyone know the purpose of this thing? Please understand that i'm just trying to figure out what this is for. thanks.
Senior User
Joined: Aug 2003
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From: Santa Barbara
Mine is missing that piece and is shakes like crazy around town. It does smooth out on the highway. I'd like to hear what you find out. Mine appears to be a rebuilt unit and not the original.
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
ok guys you are thinking of the cast iron gigantic harmonic/dampener/ pulley. it was a factory piece on most trucks 73-79. so it appears you have the car pulley version which is cheaper and easier to find. to change them just loosen the belt remove the 1/2'' bolt screw in a 5/8'' bolt until it pops off then put on you new pulley and tighten the 1/2'' bolt down. reinstall the belt and your done.
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From: Las vegas, Nevada.
Yep, That's the same for mine. It's a rebuilt unit that was put on the truck before I bought it. I'm thinking that it must smooth it out. I am going to pick one up from the pic a part sometime durring the next week I hope. If it works I will let you know.
Cargo Master
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Originally Posted by turborich
Yep, That's the same for mine. It's a rebuilt unit that was put on the truck before I bought it. I'm thinking that it must smooth it out. I am going to pick one up from the pic a part sometime durring the next week I hope. If it works I will let you know.