Strange sound from front of engine?
#1
Burning Brakes
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It's not a metallic sound but more of a "cha ch cha" that speeds up with acceleration. It's pretty annoying.....not a whining sound though. I thought it might have been my dust cover/rotor but wasnt. Had my TB/WP changed 10k ago and PorscheDoc re-tensioned it...about 2 1/2 years. It just started about 3 weeks ago....bad water pump? I searched and didnt find anything conclusive. Could my belt be loose and slapping the cover? It seemed to go away when my A/C was recently charged but started again when a slow leak prevented the compressor from engaging. I dont know if this is a coincidence or related.
Last edited by BlackOp; 08-03-2010 at 12:42 PM.
#2
Burning Brakes
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Nobody has any suggestions?....that might be a first. ![Stick Out Tongue](https://rennlist.com/forums/images/smilies/tongue.gif)
Anyway, I've isolated the ticking sound to the lower right side pulley. I did a search and found this...belts were changed about 3k ago.
"The wobbling pulley is probably because the crank bolt was not torqued correctly, or the spacer washer was put on backwards. Not terribly hard to correct, but does require a flywheel lock, a 24mm or 15/16th socket and a good breaker bar."
Would this cause my ticking problem?
![Stick Out Tongue](https://rennlist.com/forums/images/smilies/tongue.gif)
Anyway, I've isolated the ticking sound to the lower right side pulley. I did a search and found this...belts were changed about 3k ago.
"The wobbling pulley is probably because the crank bolt was not torqued correctly, or the spacer washer was put on backwards. Not terribly hard to correct, but does require a flywheel lock, a 24mm or 15/16th socket and a good breaker bar."
Would this cause my ticking problem?
#5
Burning Brakes
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This morning, I drove it down to the corner store and there was no sound. I popped the hood and nothing. I got back in and drove about another 5 minutes and it started only very faintly. I got on my knees and it is definitely coming from the the lower right pulley....a/c compressor. Drove it again and it became louder. The frequency stays consistent, just speeds up with RPMs.
I'm in Wicker Park.
I'm in Wicker Park.
#6
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AC compressor pulleys have been known to just "fall off." What happens is the center actually stays attached to the compressor but the outside clutch pulley snaps free from the little arms that hold it.
I don't know exactly what causes this but I have seen it a few times. Inspect it closely because if it comes free you will not have a belt for the alternator until you get a new ac compressor clutch.
I don't know exactly what causes this but I have seen it a few times. Inspect it closely because if it comes free you will not have a belt for the alternator until you get a new ac compressor clutch.
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#9
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if the AC is on, the center and the pulley are locked together. if AC is off, center shouldn't spin.
i'd say take the belt off and see if there's any wiggle on the pulley...i dunno exactly how it fails. maybe travis can shed some more light on it.
i'd say take the belt off and see if there's any wiggle on the pulley...i dunno exactly how it fails. maybe travis can shed some more light on it.
#11
Burning Brakes
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Could the pulley be pulling/catching the clutch? My A/C works..if this helps. Nothing was loose when I rotated the clutch...
#12
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so it sounds like the clutch isn't fully disengaging from the pulley. i'm still not sure how to fix it though...it'd prob involve removing the front portion and servicing the clutch mechanism. not sure if u can do that while it's in the car
#13
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I have a used but good AC compressor up in Madison, WI if you end up needing one. Came off an '89 turbo but I think they are all the same. Let me know if you would like to work something out.
#14
Burning Brakes
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Thanks for the offer...I think I will wait until I'm positive that's my issue though. Right now...it's just an annoying sound. I will probably recharge my system again as the noise stopped when the compressor could engage. The leak was pretty slow so I will give some stopleak a whirl.