Re: {Chrysler 300} 300K A/C clutch diameter.

[Keith Boonstra <kboonstra.zeegroup@xxxxxxxxx>]

James,

I took my calipers out to the toy barn to be certain about the diameters of the A/C clutches and found that the earlier style using the external brushes has a diameter of 7.5”. The later post-‘60 induction clutch has a diameter of about 5”. In both cases the diameter of the pulleys is 6.25”.

So the info you got from John is correct, and the one you need will be known by seeing whether your pump has a pair of brushes in place next to the compressor shaft to contact the rotating windings of the clutch.

Keith Boonstra

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On Tue, Mar 28, 2023 at 9:49 AM 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Thanks Keith,

 

I was wondering. I see several both reman and NOS units and they show up in both sizes. Many say this number supersedes that number.

 

That explains it.

 

Best, James

 

From: Keith Boonstra <kboonstra.zeegroup@xxxxxxxxx>
Sent: Monday, March 27, 2023 22:23
To: James Douglas <jdd@xxxxxxxxxx>
Cc: Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx) <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} 300K A/C clutch diameter.

 

James,

 

The AC clutches with the external brushes from the 50s through '59 or maybe 60 were about 7" diameter overall. After Chrysler went to the induction style clutch activators (about 1960) the clutch diameter was reduced to a little over 5". That is what your K should have. I have both lying around and could measure them exactly for you later today.

 

Please note that there will not be a performance difference between the two because even though the clutch diameters are widely different the sheave (pulley) diameter is actually equal between them. And they can use the same length of belt.

 

Keith Boonstra

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Virus-free.www.avast.com

 

On Mon, Mar 27, 2023 at 9:43 PM 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Hi All,

 

As far as I can tell the pulleys on the A/C are 6-1/4 inch OD. But I have noted that the actual clutch diameter on the one on the car which is clearly a reman is almost as large as the pulley in OD. The one on the bench that I got from John at Big M and he said came out of a ’64 the clutch OD is smaller by about an inch that the pulley OD.

 

Can anyone tell me if one or the other is correct and/or are there any performance differences between them?

 

 

Thanks, James

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