11-13-2010, 12:10 AM
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#1
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Registered User
Join Date: Jun 2010
Location: spain
Posts: 69
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buzzing engine noise. Help!
Hello, I started to hear a buzzing sound, I think was the belt tensioner or any accesory (water pump, alternator,..) bearing of the belt, I checked all of them and the belt and is OK. I haven't discovered where side the noise come, I only hear inside the engine.
What do you think is?
you can see a video I've recorded:
http://www.youtube.com/watch?v=p85bzy-3Mjg
Last edited by heiwaz; 11-13-2010 at 12:13 AM.
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11-13-2010, 03:04 AM
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#2
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Registered User
Join Date: Apr 2010
Location: trenton nj
Posts: 449
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remove the belt then start the motor for a short time while listening. if noise is gone shut motor off and feel all the pulleys for play
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11-13-2010, 03:08 AM
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#3
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Registered User
Join Date: Aug 2007
Location: Virginia
Posts: 244
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^--- what he said. Definitely sounds like an accessory -- my bet is alt. Don't run the engine for more than 30 sec without the belt... But you probably knew that already.
__________________
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'00 Boxster S
'86 911 Carrera Coupe (Sold)
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11-13-2010, 04:47 AM
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#4
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Registered User
Join Date: Jun 2010
Location: spain
Posts: 69
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I started the motor without the belt, but the noise still go on.
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11-13-2010, 04:52 AM
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#5
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Registered User
Join Date: Apr 2010
Location: trenton nj
Posts: 449
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try unscrewing oil fill cap while engine is making noise
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11-13-2010, 06:04 AM
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#6
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Registered User
Join Date: Jun 2010
Location: spain
Posts: 69
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Why should I try this? if I remove the oil fill cap, the noise dissapear and why?
Unfortunately at the moment is impossible to try this, because I have doing the IMS upgrade, and the gear box and clutch is out of the engine. But I want to take advantage of this dissasembly to give a solution to this noise.
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11-13-2010, 07:36 AM
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#7
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Registered User
Join Date: Apr 2010
Location: trenton nj
Posts: 449
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some of te sounds people report from the AOS going bad are ...well a little odd
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11-13-2010, 08:54 AM
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#8
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Registered User
Join Date: Jun 2010
Location: spain
Posts: 69
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so, if the problem came from de AOS when I try to unscrew oil fill cap, what happend with it? it's hard to remove or what? thanks.
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11-13-2010, 09:24 AM
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#9
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Registered User
Join Date: Apr 2010
Location: trenton nj
Posts: 449
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have you talked this noise over with the people that are working on your motor ?
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11-13-2010, 09:55 AM
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#10
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Registered User
Join Date: Jun 2010
Location: spain
Posts: 69
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No, I'm doing by myself. I've got mechanical title 
I'will check the AOS.
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11-14-2010, 12:27 PM
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#11
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Registered User
Join Date: Sep 2010
Location: Pa.
Posts: 103
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Do a search ....
Quote:
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Originally Posted by heiwaz
No, I'm doing by myself. I've got mechanical title
I'will check the AOS. |
Search using the word AOS then find the post called " Is my AOS going?" Scroll down and read the posting by 944boy. His post sounds very much like what you describe.
Good luck,
J T
Sorry I don't know how to copy the link to someone else's posting for you.
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11-14-2010, 02:26 PM
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#12
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Registered User
Join Date: Jun 2010
Location: spain
Posts: 69
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Quote:
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Originally Posted by J Tinsby
Search using the word AOS then find the post called " Is my AOS going?" Scroll down and read the posting by 944boy. His post sounds very much like what you describe.
Good luck,
J T
Sorry I don't know how to copy the link to someone else's posting for you.
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This sound he described is a vacuum sound, it's different that mine.
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11-15-2010, 05:09 AM
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#13
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Registered User
Join Date: Apr 2009
Location: Orlando
Posts: 1,266
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When a AOS goes bad or starts to go bad you may have a different warning sounds. The most common is smoke coming out of the engine when running. Mine made a whistle like screetch when the engine warmed up. The vacuum that is being pulled can suck air around the crankshaft seal. So, if you cannot remove the oil filler cap when the engine is running then the AOS is going bad. Was this noise there before you started doing the engine maintenance, if so, then you did not cause the problem. Not sure if you are suppose to run a flat 6 with the flywheel off.
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11-15-2010, 05:39 AM
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#14
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Registered User
Join Date: Apr 2010
Location: trenton nj
Posts: 449
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Quote:
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Originally Posted by jcb986
When a AOS goes bad or starts to go bad you may have a different warning sounds. The most common is smoke coming out of the engine when running. Mine made a whistle like screetch when the engine warmed up. The vacuum that is being pulled can suck air around the crankshaft seal. So, if you cannot remove the oil filler cap when the engine is running then the AOS is going bad. Was this noise there before you started doing the engine maintenance, if so, then you did not cause the problem. Not sure if you are suppose to run a flat 6 with the flywheel off.
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i wanna see him start it with the flywheel off...does yours have a pull start
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11-15-2010, 05:50 AM
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#15
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Registered User
Join Date: Jun 2010
Location: spain
Posts: 69
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this noise appeared, 2 das before I start to do the maintenance.
Is possible this noise come from the start engine?
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11-15-2010, 03:07 PM
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#16
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Registered User
Join Date: Apr 2009
Location: Orlando
Posts: 1,266
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Get a stethoscope from the auto store, remove the belt and listen for the sound around the crankshaft seal and listen to the timing chains. How many miles the Box.
__________________
http://i768.photobucket.com/albums/x...6/PC120055.jpg
Old Hippie Young Heart
2000 S/3.2 Liter/Tiptronic/Boxster S Sport Package/Cruise Control/Slate Grey Metallic
Red Special Leather Interior/Red Floor Mats/Red Hand Painted Instrument Dials/Roll Bar/Windstop
Small Carbon Package/Leather Wrap Carbon Wheel/Center Console Exterior Color/Alum Carbon Shift Knob
AM/FM Radio w/CD Player & Changer/Digital Sound Package/18" Turbo Wheels/Wheel Caps w/Colored Crest
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11-16-2010, 08:35 AM
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#17
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Registered User
Join Date: Jun 2010
Location: spain
Posts: 69
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Quote:
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Originally Posted by jcb986
Get a stethoscope from the auto store, remove the belt and listen for the sound around the crankshaft seal and listen to the timing chains. How many miles the Box.
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it has got around 90000 miles.
Now I'm changin the IMS bearing, so the chain are loose, how can I check it? should I check the chain tensioner, too?
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11-16-2010, 08:42 AM
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#18
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Registered User
Join Date: Apr 2010
Location: trenton nj
Posts: 449
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pull the oil sump and cut open your oil filter....tell us what colors you find and the size of the stuff
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11-16-2010, 09:08 AM
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#19
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Registered User
Join Date: Jun 2010
Location: spain
Posts: 69
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Quote:
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Originally Posted by extanker
pull the oil sump and cut open your oil filter....tell us what colors you find and the size of the stuff
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sorry I don't undestand very well you what you want to tell me. can you explain me? do you want to open de oil filter to see what color is? I emptied the oil, but I've got the old oil keep in a bottle.
Sorry but my english sometimes is not perfect. thanks.
Last edited by heiwaz; 11-16-2010 at 09:11 AM.
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11-16-2010, 09:15 AM
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#20
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Registered User
Join Date: Apr 2010
Location: trenton nj
Posts: 449
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do you know anyone in your area that knows engines made by PO that can help you ?
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