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I have a 2001 2.7.... It has a knocking sound coming from the A/C compressor. Who knows... it could be travaling from the crankcase. It might be a conrod knock. If it was a crank knock it would be a deeper sounding knock.

What can I check? And please no guesses... or maybes or proboblys, if theres a tech here, I'd like to hear from him mainly.
 

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Not see much for odd noises from the 2.7, but you might look at your crank damper for seperation of outer ring (pulley) from center hub.

A/C compressor could make noise, does it change with clutch off or on ?

Have had chains on top of head that ties the cams toghter, but that is more of a hash type noise I think.

If engine neglected (missed oil changes here-there), might could start a rod/main knock, but that is something we dont see, had 1 drop a cylinder liner on #6, but the engine would not run there.

Just spend some time with ear probe (long skinny screwdriver work good), take the drive belt off to take alt - a/c - p/s out of the loop, see if it go away or still there, that;ll cut some of the background noise. Have heard of random drive plate cracking, see if it change tone when put in gear and load the throttle a little bit (light stall test).. try it in reverse and drive..
 

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QUOTE (sbr711 @ Aug 3 2010, 04:49 PM) index.php?act=findpost&pid=346904
Not see much for odd noises from the 2.7, but you might look at your crank damper for seperation of outer ring (pulley) from center hub.

A/C compressor could make noise, does it change with clutch off or on ?

Have had chains on top of head that ties the cams toghter, but that is more of a hash type noise I think.

If engine neglected (missed oil changes here-there), might could start a rod/main knock, but that is something we dont see, had 1 drop a cylinder liner on #6, but the engine would not run there.

Just spend some time with ear probe (long skinny screwdriver work good), take the drive belt off to take alt - a/c - p/s out of the loop, see if it go away or still there, that;ll cut some of the background noise. Have heard of random drive plate cracking, see if it change tone when put in gear and load the throttle a little bit (light stall test).. try it in reverse and drive..
I only hear it at idle..... even when the A/C is running... I'll try the taking off the belt...
 

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QUOTE (gweedo @ Aug 3 2010, 06:07 PM) index.php?act=findpost&pid=346918
I only hear it at idle..... even when the A/C is running... I'll try the taking off the belt...
I read your initial post again, with the belt off, I want you to roll the pulley on the A/C compressor, verify it is smooth... it has a 2 row ball brg in the pulley to compressor nose... take and grab the pulley, and see if it has any unusual excessive slop/lash in the bearing, if so, then replace the pulley..

There is the plastic idler pulley by the compressor where the belt come down from P/S pulley to make the turn to the A/C pulley, those sometimes make noise, but not very often,, it has a single row ball brg in it.
 

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QUOTE (sbr711 @ Aug 3 2010, 08:31 PM) index.php?act=findpost&pid=346944
I read your initial post again, with the belt off, I want you to roll the pulley on the A/C compressor, verify it is smooth... it has a 2 row ball brg in the pulley to compressor nose... take and grab the pulley, and see if it has any unusual excessive slop/lash in the bearing, if so, then replace the pulley..

There is the plastic idler pulley by the compressor where the belt come down from P/S pulley to make the turn to the A/C pulley, those sometimes make noise, but not very often,, it has a single row ball brg in it.

I replaced the A/C clutch coil, and the pulley bearings are fine...the bearing is tight.. I also removed the idle pulley to check and the bearing is also tight.
 
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