08-22-2012, 08:52 AM
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#21
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Registered User
Join Date: Jul 2011
Location: USA
Posts: 67
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Might want to pull the oil filter and inspect before any more testing.
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08-22-2012, 09:00 AM
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#22
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Theoretical propagandist
Join Date: Dec 2011
Location: Pacific Northwest
Posts: 793
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Plus 1 on the oil filter, also...if you don't have a stethescope, a dowel rod will work just as well (1/4 to 3/8 in diameter).
Have you taken your interior engine cover (behind the seats) off as well as the top engine cover? In listening to the video it almost has a failed bearing from a steering pump or AC unit...just a guess. Fingers crossed for you it is something minor and fixable.
__________________
When life throws you curves, aim for the apex...
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08-22-2012, 09:15 AM
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#23
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DIY extremist
Join Date: Jul 2011
Location: Brooklyn
Posts: 348
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The AC is off. I hear the noise when trying to start the car, and then again when trying to accelerate the flywheel. I do have a stethoscope, but the noise is too intermittent to fin using this method I think
__________________
"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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08-22-2012, 09:53 AM
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#24
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Registered User
Join Date: Jul 2011
Location: USA
Posts: 67
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Try removing the serpentine belt, that way you can eliminate the AC compressor, power steering pump, alternator, water pump, and idler bearing. Be careful not to run it any longer then needed to diagnose the noise with no cooling.
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08-22-2012, 09:55 AM
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#25
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Registered User
Join Date: Oct 2010
Location: US, Calif
Posts: 72
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Just a thought.... what if you pulled the spark-plugs and rotated the engine by hand.... listen/feel for any roughness or rubbing. If there is some then pull the serpentine belt and rotate again. Like Eric G mentioned could be a bearing on anything connected to the engine. Maybe focus on those items closest to the driver side first. If you feel no rubbing without the belt then check all the items driven by the belt. If all that comes up negative then it possible the IMS sprocket moved during the IMS bearing install and is rubbing. If that happened then it's probably 'pull the engine time'..
Wish we could help hands on.
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08-22-2012, 11:57 AM
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#26
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Registered User
Join Date: Oct 2011
Location: sac. ca
Posts: 156
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Try putting on your old flywheel and see if the noise changes....
__________________
98 boxster
82 280sl parts for sale
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08-22-2012, 12:35 PM
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#27
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DIY extremist
Join Date: Jul 2011
Location: Brooklyn
Posts: 348
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can't, don't have it anymore.... the machine shop resurfaced it, but then said it was bad. They still won't give it back without me paying out...
__________________
"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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08-22-2012, 12:58 PM
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#28
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DIY extremist
Join Date: Jul 2011
Location: Brooklyn
Posts: 348
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Here's a question:
What physical changes in the positions of various engine parts occur when the engine is under load (either accelerating or being loaded at idle by the clutch)? That will help me to narrow down the list of possibly interfering parts. I am also planning to slip off the drive belt to rule out any bad accessories. The motor was running / sounding fine before this whole mess (other than a cold startup rattle that I hear is pretty common on older boxsters)
__________________
"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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08-22-2012, 01:22 PM
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#29
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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Here is a real dumb idea. Are there any bolts that pertrude through the fly wheel hitting the engine block? Just another thought.
__________________
996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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08-22-2012, 01:58 PM
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#30
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Thinking out loud... If a chain tensioner became hyper-extended and was stuck beyond it's normal range of travel due to movement during the IMS retro, would it cause a nasty noise like that? My brother developed a squeal on his 99 and it was worn out chain tensioners.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 08-22-2012 at 02:02 PM.
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08-22-2012, 05:07 PM
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#31
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DIY extremist
Join Date: Jul 2011
Location: Brooklyn
Posts: 348
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Mystery solved? Read on...
After running the car with the cam tensioners loosened with no effect, and with the serpentine belt off (no change here either), I pulled the flywheel and think I found the culprit. See pics below:
Fresh nicks in the engine side of the bell housing.There were more of these.
These are closeups of the teeth on the backside of the flywheel.
The pics are not great, but I think that what they show is that the flywheel was off-balance and was oscillating under load, causing it to hit the case, producing an awful racket. The horizontal teeth on the backside appeared to be bent inwards a little bit.
The only thing that throws me off is that the noise did seem to emanate from the left cylinder bank, but it's possible that was due to acoustics within the engine compartment. I was never able to isolate it with the stethescope.
Am I justified in thinking this was the cause of all the trouble?
I guess I'll be ordering a new LUK flywheel and bolts in the AM. What a ********************show this whole job has been...
__________________
"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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08-23-2012, 08:47 AM
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#32
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Registered User
Join Date: Oct 2010
Location: US, Calif
Posts: 72
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At least it wasn't the IMS sprocket... that's a good thing.
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08-27-2012, 07:23 PM
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#33
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Registered User
Join Date: Nov 2009
Location: vancouver bc canada
Posts: 38
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Black Box was it the fly wheel like you thought? I've got exact same sound and it's driving me crazy. Had serpentine belt changed today and pulleys checked no cigar. Mechanic thinks it might be the water pump but it's not leaking at all.
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08-28-2012, 01:22 AM
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#34
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Registered User
Join Date: Dec 2008
Location: Queensland, Australia
Posts: 1,522
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Even if the water pump is not leaking, it could still have faulty shaft / bearings....
__________________
2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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08-28-2012, 09:30 AM
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#35
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Registered User
Join Date: Nov 2009
Location: vancouver bc canada
Posts: 38
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Thanks Steve I guess it's a new water pump then. Needs to be done regardless I'd imagine been awhile hopefully solves the squealing.
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08-28-2012, 01:47 PM
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#36
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DIY extremist
Join Date: Jul 2011
Location: Brooklyn
Posts: 348
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The flywheel was not the problem. I replaced it, and still had the squeak. After spending more time under the car while an assistant revved it, I think it's coming from the left hand cam sprocket area.
__________________
"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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08-28-2012, 02:19 PM
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#37
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Registered User
Join Date: Nov 2009
Location: vancouver bc canada
Posts: 38
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Sorry to hear you still have the squeal. Have you considered it could be the water pump? Like I said earlier I have the same problem exact same sound as your video. Changed the serpentine belt and checked all pulleys still squeals. The shop that did it stated it seems to be the water pump but I didn't wanna pay to change it yesterday as they said its not leaking.
Curious if anybody else has noticed a squeal before changing water pump?? Seems to be quiet until car warms up as well.
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08-28-2012, 02:24 PM
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#38
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DIY extremist
Join Date: Jul 2011
Location: Brooklyn
Posts: 348
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It makes the squeal even with belt removed.
__________________
"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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08-28-2012, 07:02 PM
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#39
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DIY extremist
Join Date: Jul 2011
Location: Brooklyn
Posts: 348
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I've pulled my IMS cover off again, and with it off, with both rear tensioners off at TDC and with cams locked I see that the entire IMS shaft is cocked off at an angle.
Could this be related to the noise?
__________________
"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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08-28-2012, 08:47 PM
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#40
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Ouch! After the IMS retro-gone-bad fiasco I had a feeling it might be fecked. I'm not sure if this can be repaired without splitting the cases. Ever considered a nice used 3.4L?
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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