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

ercp98

Well-known member
Joined
Aug 5, 2003
Messages
1,340
Location
northlake in illinois
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
 

donniekak

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Joined
Jan 1, 2009
Messages
748
Location
surprise az
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.
 

curtis

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May 4, 2003
Messages
11,892
Location
Clarksville TN
I believe max is like 8 thousandths .....get a dial indicator to check for the crankwalk
 

gvr4ever

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Aug 6, 2002
Messages
6,190
Location
central Indiana
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.
 

donniekak

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Joined
Jan 1, 2009
Messages
748
Location
surprise az
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.
 

ercp98

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Joined
Aug 5, 2003
Messages
1,340
Location
northlake in illinois
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?
 

donniekak

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Joined
Jan 1, 2009
Messages
748
Location
surprise az
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.
 

ercp98

Well-known member
Joined
Aug 5, 2003
Messages
1,340
Location
northlake in illinois
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.
 
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