05-19-2016, 12:20 PM
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#1
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,797
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Clunk when shifting
I get a clunk when shifting from 1 to 2 or 2 to 3 over 3000 RPM when cold
The clunk happens when I depress the clutch and is from the back of the car. It does seem to be more on the right than the left and definitely in the rear
Once the car warms up , the clunk goes away or at very least a very quite clunk
I have ~ 80k on the car with the original motor mount. I looked at the CVs and all have perfect boots and no leaks. I thought it might be the motor mount, but with the problem not happening when the car is warmed up, I'm not so sure. Also there is no vibration in the car or shifter nor any movement in the shifter.
Any ideas to what the problem is?
__________________
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
Last edited by JayG; 05-19-2016 at 12:22 PM.
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05-19-2016, 12:40 PM
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#2
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98 Arctic silver 986
Join Date: Jul 2011
Location: Upstate, NY
Posts: 1,452
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I would still suspect the motor mount. At 80K it's got to be getting near the end of it's life.
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05-19-2016, 12:46 PM
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#3
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Quote:
Originally Posted by tommy583
I would still suspect the motor mount. At 80K it's got to be getting near the end of it's life.
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Motor mount would be on my short list.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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05-19-2016, 01:06 PM
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#4
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,797
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Ok, that's what I thought, but why does the clunk go away when the car is warmed up?
__________________
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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05-19-2016, 01:17 PM
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#5
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Registered User
Join Date: Oct 2015
Location: Austin
Posts: 395
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Cause rubber softens
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05-19-2016, 01:28 PM
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#6
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,797
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Makes sense, as it gets warm, it softens and expands
__________________
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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05-27-2016, 08:37 PM
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#7
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,797
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Well, I am pretty sure the clunking was caused by the motor mount
Pulled it out this evening
What do you think?
__________________
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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05-27-2016, 11:08 PM
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#8
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Registered User
Join Date: Jun 2014
Location: LB, Germany
Posts: 1,512
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Quote:
Originally Posted by JayG
Well, I am pretty sure the clunking was caused by the motor mount
Pulled it out this evening
What do you think?
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I think you need a new one.  This one is completely gone.
No wonder that you've got a clunk.
Regards, Markus
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05-28-2016, 05:45 AM
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#9
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Registered User
Join Date: Apr 2016
Posts: 161
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Quote:
Originally Posted by Smallblock454
I think you need a new one. This one is completely gone.
No wonder that you've got a clunk.
Regards, Markus |
Markus - how can you tell, is it just worn down?
Sent from my iPhone using Tapatalk
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05-28-2016, 06:32 AM
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#10
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Registered User
Join Date: Jun 2014
Location: LB, Germany
Posts: 1,512
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Quote:
Originally Posted by GTsilber
Markus - how can you tell, is it just worn down?
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Hello GTSilber,
that is pretty easy. First i use Photoshop to correct the photo – so that i can see the damage.
And there you see that the upper part of the black gum is completely tored off and broken out - means you will have contact under torque.
There is another thread where you can see other worn mounts and a new one: http://986forum.com/forums/performance-technical-chat/58375-changed-motor-mount-@-95k.html On the second side i did some photos.
Regards
Markus
Last edited by Smallblock454; 05-28-2016 at 06:40 AM.
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05-28-2016, 07:01 AM
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#11
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Registered User
Join Date: Apr 2016
Posts: 161
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Quote:
Originally Posted by Smallblock454
Hello GTSilber,
that is pretty easy. First i use Photoshop to correct the photo – so that i can see the damage.
And there you see that the upper part of the black gum is completely tored off and broken out - means you will have contact under torque.
There is another thread where you can see other worn mounts and a new one: http://986forum.com/forums/performance-technical-chat/58375-changed-motor-mount-@-95k.html On the second side i did some photos.
Regards
Markus |
Got it- vielen danke!
Sent from my iPhone using Tapatalk
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05-28-2016, 09:23 AM
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#12
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still plays with cars...
Join Date: May 2011
Location: Baden, ON, Canada
Posts: 1,088
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Quote:
Originally Posted by JayG
Well, I am pretty sure the clunking was caused by the motor mount
Pulled it out this evening
What do you think?
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Yup, all wallered out.
__________________
Six speed 2000 Boxster S
Arctic Silver on Metropol Blue | LN Dual Row IMSR | Arctic Silver console, spoiler frame & bumperettes | Crios mod | Technobrace | RoboTop module & modified convertible top relay for one-touch roof operation
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05-28-2016, 05:24 AM
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#13
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,432
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I bought the press in replacement. Hope it goes well. One of the next items for me.
__________________
'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
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05-28-2016, 07:09 AM
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#14
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,797
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Quote:
Originally Posted by Timco
I bought the press in replacement. Hope it goes well. One of the next items for me.
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same here. The insert is around $30 and the full part $175+
now just need to find a place to get it pressed in today!
__________________
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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05-28-2016, 08:03 AM
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#15
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Registered User
Join Date: Nov 2015
Location: ontario
Posts: 377
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Quote:
Originally Posted by JayG
same here. The insert is around $30 and the full part $175+
now just need to find a place to get it pressed in today!
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Best price I've found is $140 at suncoast.
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05-28-2016, 08:46 AM
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#16
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Rookie
Join Date: May 2014
Location: Portland Oregon
Posts: 215
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Mine is past due Im sure. For me I think getting it pressed would be more hassle than the extra $110....
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05-28-2016, 09:20 AM
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#17
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Registered User
Join Date: Nov 2015
Location: ontario
Posts: 377
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I considered pressing in a new bushing as well but the problem is that if you don't have quick access to a press the car would be out of commission for as long as it takes for you to find a place that is able to swap the bushing for you. So for me the extra $100 or so is worth is it because I won't have to worry about the car being in a state of disassembly while I figure out swapping the bushing.
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05-28-2016, 02:10 PM
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#18
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,797
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****** UPDATE *******
Got the insert pressed in at a machine shop. Cost $25
Installed it back in the car and took it for a test drive.........
Smooth as silk!!! :dance:
All in all probably around 3-4 hours including jacking up the car and getting the insert pressed in. Its a reasonable easy DIY
This thread is very helpful
http://986forum.com/forums/performance-technical-chat/58375-changed-motor-mount-@-95k.html
Total cost
$35 for the insert
$55 for the shims
$25 for pressing the insert in
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$115
Had I bought a new mount, I would still need the new shims. I effectively paid $60 for a new mount
__________________
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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05-28-2016, 02:30 PM
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#19
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Registered User
Join Date: Nov 2015
Location: ontario
Posts: 377
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How were the old shims when you took them off? Did they need to be changed or did you just change them because you had already purchased the new ones?
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05-28-2016, 06:03 PM
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#20
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,797
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Quote:
Originally Posted by boxxster
How were the old shims when you took them off? Did they need to be changed or did you just change them because you had already purchased the new ones?
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My shims were fine, but since I put in the 987 part, it is supposed to use the newer shims which are a few mm thicker. My feeling was I would not be changing the mount for a long time and since I saved a bunch of $$ but replacing the insert, might as well used the proper shims.
All in all, I spent less including the stupidly expensive shims saving around 35% of the cost of the full replacement part. And didn't have a piece of scrap aluminum left over
__________________
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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2004 Porsche Boxster S
2004 Porsche 996 Targa
1998 Porsche 986
Lil Red
2009 Porsche Cayman 2.9L
Udo
No name
Hybrid Mode
