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is this a symptom of crankwalk or a frozen throw out bearing?


ercp98
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Galant VR-4 org Post #: 1232226 posted 10/02/16 11:16 PM     Remind Me!  Send Private Message   Edit Post      
Good evening,

Please see attached video.

The noise goes away or seems muffled when i depress the clutch pedal.
Then I tried something I read on dsm tuners, rev the car to 2k and depress the clutch pedal, the rpm did go down but just a little.

Also you can see in the video that at idle, the car dies as soon as I depress the clutch.

My clutch is an old ACT 2100. I also felt clutch slippage a few days before these symptoms were manifested.

I also tried to visually confirm if the crank pulley would move when the clutch pedal was push in. I did not see any noticeable movement on the crank pulley.

Can these "symptoms" be cause by a dying clutch and an old TOB that is frozen and does not spin anymore?

Thank you in advance for any advice and suggestion.

video link:


click

Posts: 1329 | From: northlake in illinois | Member Since: 08/05/03 | IP: (2602:306:36fe:84) | Report this post to a Moderator

donniekak
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Galant VR-4 org Post #: 1232227 posted 10/03/16 12:16 AM     Remind Me!  Send Private Message   Edit Post      
It's probably the throw out bearing. To check for bad crank walk grab the crank pulley and push and pull on it. If it's walked bad you'll feel the movement, and hear it clicking or knocking back and forth.

Posts: 747 | From: surprise az | Member Since: 01/01/09 | IP: (97.124.17.161) | Report this post to a Moderator

curtis Galant VR4.org Moderator
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Galant VR-4 org Post #: 1232230 posted 10/03/16 03:52 AM     Remind Me!  Send Private Message   Edit Post      
I believe max is like 8 thousandths .....get a dial indicator to check for the crankwalk



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gvr4ever
Forever Member
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Galant VR-4 org Post #: 1232235 posted 10/03/16 06:33 AM     Remind Me!  Send Private Message   Edit Post      
A flexing shift fork can fake crankwalk symptoms. I remember many moons ago when I was on the original and a ACT 2600 clutch, I would go around a corner and I would have a odd delay of clutch action on the release.

I'd imagine it could be anything that would involve clutch release. Fork, TOB, damaged clutch forks, or even running out of friction material. I have never in my life worn out a TOB before a clutch, so that would be a neat trick.



1992 Nile black w/sunroof
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Posts: 5808 | From: Crawfordsville, IN | Member Since: 08/06/02 | IP: (172.68.59.44) | Report this post to a Moderator

donniekak
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Galant VR-4 org Post #: 1232239 posted 10/03/16 08:48 AM     Remind Me!  Send Private Message   Edit Post      
Quoting curtis:

I believe max is like 8 thousandths .....get a dial indicator to check for the crankwalk




That is the spec I go by when building engines. But for a car to show symptoms, especially a 1g engine with no crank sensor, the play is usually at least 1/16" and you can physically feel it.

Posts: 747 | From: surprise az | Member Since: 01/01/09 | IP: (97.124.17.161) | Report this post to a Moderator

ercp98
perpetual n00b
1148/2000


Galant VR-4 org Post #: 1232240 posted 10/03/16 09:14 AM     Remind Me!  Send Private Message   Edit Post      
thank you guys.

i will try and get a dial gauge and get a measurement.
but for now that the engine is still in the car, can i just physically
pull on the crank pulley and check for movement? do i need the
accessory belts off to do this?

Posts: 1329 | From: northlake in illinois | Member Since: 08/05/03 | IP: (2600:1008:b106:4) | Report this post to a Moderator

donniekak
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Galant VR-4 org Post #: 1232248 posted 10/03/16 06:45 PM     Remind Me!  Send Private Message   Edit Post      
I'm still betting on your tob. To check for crank thrust play its best to at least take the tension off the acc belts.

Posts: 747 | From: surprise az | Member Since: 01/01/09 | IP: (97.124.17.161) | Report this post to a Moderator

ercp98
perpetual n00b
1148/2000


Galant VR-4 org Post #: 1233007 posted 10/30/16 10:10 PM     Remind Me!  Send Private Message   Edit Post   
just an update and to add a resolution for future reference.

there is no crank walk. confirmed with dial caliper.
this turned out to be a frozen throw out bearing and a slightly bent fork.
all parts replaced.

thanks for all the advice.

Posts: 1329 | From: northlake in illinois | Member Since: 08/05/03 | IP: (2602:306:36fe:84) | Report this post to a Moderator


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