08-22-2015, 08:36 AM
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#1
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Registered User
Join Date: Nov 2004
Location: New Jersey
Posts: 8,709
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Clacking noise from alternator area
The fun continues. After having the AC compressor, belt tensioner and rollers replaced (car is still at the shop) a new clacking sound emerges from the alternator area when the engine is revved. The clacking gets faster as the revs go up and tapers off as the car retuns to idle. A new alternator did not cure the issue. Anyone else experience this issue?
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GT3 Recaro Seats - Boxster Red
GT3 Aero / Carrera 18" 5 spoke / Potenza RE-11
Fabspeed Headers & Noise Maker
BORN: March 2000 - FINLAND
IMS#1 REPLACED: April 2010 - NEW JERSEY -- LNE DUAL ROW
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08-22-2015, 09:44 AM
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#2
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,277
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Quote:
Originally Posted by Perfectlap
The fun continues. After having the AC compressor, belt tensioner and rollers replaced (car is still at the shop) a new clacking sound emerges from the alternator area when the engine is revved. The clacking gets faster as the revs go up and tapers off as the car retuns to idle. A new alternator did not cure the issue. Anyone else experience this issue?
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Check the declutching pulley on the alternator, they tend to make a loud "ratcheting" sound when they are dying.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-22-2015, 10:13 AM
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#3
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Registered User
Join Date: Nov 2004
Location: New Jersey
Posts: 8,709
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Thanks JFP. Do you mean the pulley on the new alternator? My mechanic came into the shop to swap in the new one and it didn't resolve the issue. They'll have to pick up on Monday. Time to find a rental car...
__________________
GT3 Recaro Seats - Boxster Red
GT3 Aero / Carrera 18" 5 spoke / Potenza RE-11
Fabspeed Headers & Noise Maker
BORN: March 2000 - FINLAND
IMS#1 REPLACED: April 2010 - NEW JERSEY -- LNE DUAL ROW
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08-22-2015, 10:13 AM
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#4
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Registered User
Join Date: May 2014
Location: S.California
Posts: 2,027
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And if you try to remove the pulley,you'll need a special tool. $8 on EBay. Part #2592. Need T50 bit also.
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08-22-2015, 11:55 AM
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#5
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,277
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Quote:
Originally Posted by Perfectlap
Thanks JFP. Do you mean the pulley on the new alternator? My mechanic came into the shop to swap in the new one and it didn't resolve the issue. They'll have to pick up on Monday. Time to find a rental car...
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Yes, the make a racket when the pulley is bad. Very easy to confirm, just remove the belt.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-24-2015, 07:04 AM
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#6
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Registered User
Join Date: Nov 2004
Location: New Jersey
Posts: 8,709
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Thanks JFP. Do you see a good reason going for the $208 Porsche OEM vs. the $48 OEM Supplier pulley? The cheaper one has a 24 month warranty.
btw, have you ever seen an AC compressor going out at nearly the same time as an engine issue?
__________________
GT3 Recaro Seats - Boxster Red
GT3 Aero / Carrera 18" 5 spoke / Potenza RE-11
Fabspeed Headers & Noise Maker
BORN: March 2000 - FINLAND
IMS#1 REPLACED: April 2010 - NEW JERSEY -- LNE DUAL ROW
Last edited by Perfectlap; 08-24-2015 at 07:28 AM.
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08-24-2015, 07:40 AM
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#7
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Registered User
Join Date: May 2009
Location: Frederick, MD
Posts: 1,396
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had the same issue after replacing my alternator. turns out one of the bolts for the alternator wasn't fully tightened down and got itself loose. allowing the alternator to rattle especially when the engine rpm went up.
__________________
"Speed has never killed anyone, suddenly becoming stationary... that's what gets you."
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08-24-2015, 08:16 AM
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#8
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,277
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Quote:
Originally Posted by Perfectlap
Thanks JFP. Do you see a good reason going for the $208 Porsche OEM vs. the $48 OEM Supplier pulley? The cheaper one has a 24 month warranty.
btw, have you ever seen an AC compressor going out at nearly the same time as an engine issue?
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I would by lying if I did; we buy OEM supplier pulleys for the shop.
If the AC compressor is also out, I would check that for noise as well. Timing is probably just a coincidence.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-24-2015, 09:33 AM
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#9
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Registered User
Join Date: Nov 2004
Location: New Jersey
Posts: 8,709
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Not the pulley. oh boy I've got engine issues. After the $2,000 AC repair...
This thing may be limping home from the repair shop into long-term storage.
A fitting end of summer after now $6,000 in repairs over the last 12 months.
I'll get the bad engine news tomorrow from the shop.
__________________
GT3 Recaro Seats - Boxster Red
GT3 Aero / Carrera 18" 5 spoke / Potenza RE-11
Fabspeed Headers & Noise Maker
BORN: March 2000 - FINLAND
IMS#1 REPLACED: April 2010 - NEW JERSEY -- LNE DUAL ROW
Last edited by Perfectlap; 08-24-2015 at 11:27 AM.
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08-24-2015, 06:15 PM
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#10
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Registered User
Join Date: Sep 2008
Location: Florida
Posts: 2,492
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That absolutely stinks.
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