Re: [Chrysler300] a/c compressor/bearing

[Keith Boonstra <kboonstra@xxxxxxxxxxxx>]

I'll bet Marshall is going to slap my wrist on this.  I was thinking 
back to the '50s and '60s clutches where the bearing is contained in the 
clutch thingy.  I haven't seen the book on it, but there must have been 
a change by 1970 wherein they moved the bearing to the pump block 
instead.  In that case a seized bearing will stop the pulley independent 
of the pump.  Oops.  Different horse, different color.

Keith Boonstra
On 4/1/2013 3:26 PM, Keith Boonstra wrote:
> Marshall,
>
> If the bearing seizes won't things act the same as if the clutch were
> energized? And then would not the compressor crank be rotated by the
> pulley the same as if the A/C were turned on? If that is correct, the
> compressor and pulley would turn as one, and the belts would not burn off.
>
> If the pulley and compressor cannot be turned by hand without the belts
> in place, I believe the compressor must be shot too. It would seem to me
> that the compressor itself may have previously seized, but that it
> remained undiscovered until the bearing also froze up. And that locked
> the entire assembly up so as to burn the belts off.
>
> N'est-ce pas?
>
> Keith Boonstra
>
> -
> On 4/1/2013 2:57 PM, Marshall Larson wrote:
>> As you may have determined there is a large bearing inside the pulley that
>> is in use 100% of the time the engine is running and belts are in place.
>> it is not an idler as it performs no belt tightening function. The bearing
>> is mounted onto the snout of the conpressor housing. The clutch disk is
>> mounted to the crankshaft of the compressor and is forced to turn only
>> when a current is passed throught the clutch coil. No current, no clutdh
>> engagement, no compressor function.
>>
>> The pulley is driven by the belts and will turn with very little
>> Resistance
>> when the engine is running. If it does not turn with the belts or you
>> can't turn it by hand when the belts are removed, it's bearing has seized
>> and must be replaced.
>>
>> The pulley and it's integral bearing are a friction fit to the
>> compressor's
>> snout and are held in place by a C clip at the center of the inner bearing
>> race. Remove the pulley assembly, press out the bad bearing, press in a
>> new bearing and reassemble to the compressor. Reassemble the clutch disk
>> and it's key to the compressor shaft. Use the nut or the bolt to move the
>> clutch toward the face of the pulley carefully as there must be an air gap
>> between the clutch disk and the face of the pulley when properly
>> reassembled. The two surfaces will never touch until a current is
>> introduced to the coil. Find the specification for the air gap and be
>> careful to not deflect the disk while setting it. The specification will
>> likely be in the .004 to .010 range.
>>
>> _,_.___
>>> <jsnowosacki@xxxxxxxxx
>> <mailto:jsnowosacki%40gmail.com>?subject=Re%3A%20a%2Fc%20compressor%2Fbearing>
>>> <Chrysler300@xxxxxxxxxxxxxxx
>> <mailto:Chrysler300%40yahoogroups.com>?subject=Re%3A%20a%2Fc%20compressor%2Fbearing>
>> S
>>>
>>>
>> -- 
>> *Marshall Larson*
>>
>> [Non-text portions of this message have been removed]
>>
>>
>
>
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