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daniel
Joined: 18 Jun 2009
Posts: 671
Location: Sydney, Australia
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 Posted: Fri Dec 08, 2023 3:42 pm Post subject: Stripped Torque Tube Spline |
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Uugh... Race Cars....
Clutch failure at Sydney Motorsport park turned out to be stripped TT spline. Upon closer inspection I found 3 of 4 bolts attaching the TT to the bell housing missing and the threads compromised....
I have the motor which came in my car in the shed untouched save from removing my car. I had proposed to remove the bell housing of this motor and use it. Closer inspection however revealed all 4 threads in the bell housing to be compromised....
My proposal is now to convert to studs with through bolts. Wish me luck!
_________________
Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet |
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Karlio
Joined: 17 Nov 2019
Posts: 69
Location: UK
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| Posted: Sat Dec 09, 2023 6:15 am Post subject: |
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| What clutch are you using? |
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daniel
Joined: 18 Jun 2009
Posts: 671
Location: Sydney, Australia
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| Posted: Sat Dec 09, 2023 6:46 am Post subject: |
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2nd picture shows the clutch.
_________________
Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet |
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Karlio
Joined: 17 Nov 2019
Posts: 69
Location: UK
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| Posted: Sat Dec 09, 2023 8:37 am Post subject: |
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| Not a standard clutch plate? |
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daniel
Joined: 18 Jun 2009
Posts: 671
Location: Sydney, Australia
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| Posted: Sat Dec 09, 2023 8:46 am Post subject: |
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Brass button clutch.
Not that I recommend but the p/n and supplier can be seen in the pic if you are interested.
_________________
Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet |
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Karlio
Joined: 17 Nov 2019
Posts: 69
Location: UK
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| Posted: Sat Dec 09, 2023 6:54 pm Post subject: |
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| Is that why the splines have gone worn due to an incorrect match |
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daniel
Joined: 18 Jun 2009
Posts: 671
Location: Sydney, Australia
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| Posted: Sun Dec 10, 2023 7:33 am Post subject: |
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Hi Karlio
Spline on clutch match the input shaft just fine, or atleast they did... The failure is due to the TT to bell housing bolts falling out as the threads in the bell housing gave way.
I don't recommend the button clutch to the high wear rate and difficulty in low speed driving with no perceivable performance advantage.
_________________
Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet |
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morghen
Joined: 21 Jan 2005
Posts: 8886
Location: Romania
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| Posted: Mon Dec 11, 2023 12:03 am Post subject: |
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Whats the benefit of using a clutch plate with no springs?
I think the cracks are because of that. And spline..likely that clutch spline profile isnt exactly matching.
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