Hey guys- in the process of replacing my clutch on my 2001 z06. I have eveything torn down. I purchased a McLeod street twin disc setup from tick racing. I installed the clutch assembly to the engine, correct torque specs. I measured from the face of the bellhousing to the tip of the pressure plate fingers and came up with 2" using square edge and digital calipers. I then measured from the face of the TOB to the base of the torque tube and got 2.25". The spring was off and TOB fully depressed. I called McLeod and they said those measurements for the clutch to bell housing are accurate. I don't want to install this with those measurements and have preload on the clucth and have the discs wear out quickly. I've been told McLeod twins have a tall deck height. Anybody have any experience or suggestions? Can anyone share they'e "A" measureent with these clutches?

 

Well,,,,,,,,, A= 2.00"
B = 2.25"

" If there is no difference between the two measurements, or if "B" is greater than "A", there could be a problem with clutch engagement which could result in premature clutch slip and eventually a total failure. Contact your clutch manufacturer before proceeding with the install.


What slave cylinder are you using? OEM?? Are you sure that it is fully collapsed?

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How to determine if a shim is needed for your setup:

During each and every clutch install you perform on a newer GM vehicle, you must measure to see if a shim is necessary for proper installation. This is done by taking two simple measurements (see worksheet):

1) Measurement "A" is the distance between the surface of the bellhousing that meets the transmission to the tip of the pressure plate fingers. To get an accurate measurement, the clutch must be torqued properly.

2) Measurement "B" is the distance between the throwout bearing surface to the transmission surface that meets the bellhousing. To get an accurate measurement, the slave spring must be removed and the bearing must be fully seated at the bottom of it's travel; resting on the slave's base.

Once you've got your two measurements, make sure that measurement "B" is ~1/16" to 1/8" LESS than measurement "A". If you come up with more than 1/8", add an appropriately sized shim between the slave cylinder and the transmission in order to get the measurements where they need to be.

Your “A minus B” measurement should be 0.125 to 0.200 for adequate bearing travel and to allow for clutch wear. If there is no difference between the two measurements, or if "B" is greater than "A", there could be a problem with clutch engagement which could result in premature clutch slip and eventually a total failure. Contact your clutch manufacturer before proceeding with the install.

 

Yup that's the method I used to measure. Last thing I want is to install it with the constant preload on the clutch.

I purchased the Tilton hydraulic 6000 series TOB, at its lowest point was 2.25". I also measured the stock TOB fully depressed and it measured 2.25" as well.

I've heard of others having issues with McLeod clutches burning up too quickly because of this. I don't want to do a clutch on this car again for awhile.

I called Tick racing and I'm waking for a return call. Hopefully we can get it resolved soon.

 

PLEASE POST what resolution that you receive..

Bill

 

Just an update, Tick Performance referred me to lead tech at McLeod. Called the guy, no answer left a message. Going around around and around. Took the clutch back off the corvette. Hopefully we can get this resolved soon, Vettes been down a few weeks already.

 

i have installed many clutches and i have a different way to measure to see if i need a shim or not. it has never failed me.
first- with both clutch sets next to each other on the ground. bolt the pressure plates to the flywheels with the clutch dishs inbetween.
second- place a straight piece of metal on the levers over the center of the hole.
third- with the caliper measure from the ground to the piece of metal.

if the new clutch is substantially thinner than the old clutch you will need a shim.
if the new clutch is substantially thicker than the old clutch you will have big problems.

less than .080 difference you’ll be fine.

these are my pics from my clutch change when i rebuild my engine. i didn’t use a shim. and i used a factory replacement slave and throw out bearing.

 

I did not measure my old clutch but thats exactly how i measure my new clutch off the engine.

McLeod called me back and wanted me to take several more measurements.

1) stack height of clutch assembled off the engine. Measuring from flywheel to pp fingers. I got 3.55".

2) distance from bellhousing to block. I got 5.9".

3) distance from torque tube mounting surface to slave mounting surface. I got .10".

My "A" measurement looks way too low at 2.00" . B measurent at 2.25". Maybe stack height is too thick? Pressure plate warped?

McLeod wants me to call them back in the morning with these measurements.

 

3.55 is too thick. something is wrong

 

This get resolved yet???

 

Turned out being a bent pressure plate. McLeod replaced and covered shipping. Cars back together and shifts great.

 

That's good to hear.. When I first got my RXT, one of my clutch discs was a 26 gm spline, the other was a mopar (18 I believe) spline.. So that was somewhat of a hassle, but it didn't hurt my timeline for getting the car together at least.

So when I installed mine though, I took the A and B measurements, and my B was greater than A... But only by 0.02".

I have ran it like this so far for about 1000 miles or so I believe and everything is fine it seems. Or I should say I have not had any issues.

 

How the heck did that get bent????

Glad its back on the road!!

BC