Nasty Vibration

Mike Voth · 06-24-2010, 08:17 AM

Got the clutch and pressure plate back yesterday. The pressure plate was out of balance by 38 grams!! We all know that these cintered iron setups warp from all the sliding, but does that usually make them out of balance?? Nothing was missing from the pressure plate, and the disc is still in one piece. Anyone ever have this issue?? The tranmission is still coming apart, hopefully tonight, but 38 grams is a TON spinning at 9000 RPM

Any other thoughts??

Adger Smith · 06-24-2010, 08:38 AM

Mike,
I'm sure thay told you 38 grams, but to really tell how much out it is the actual correction radius needs to be known... 38 G. 2 in from center is not nearly as much as 38 g. 8 in from center..... Still 38 G is a big number for any correction radius.
That could have knocked a little extra clearance in a few other vital parts. Rear bushing and Pilot bearing as well as all bearings in the tranny come to mind..
good luck

Mike Voth · 06-25-2010, 09:15 AM

The "lug" was welded just past center, more towards the outside of the hat than the inside. There was a small one on the opposite side that was cut off to balance properly. Something doesn't add up...without breaking a finger, etc., how can a pressure plate be that far out of balance?

The mainshaft appears straight, but we'll know later today for sure when we get it back from the machine shop.

Adger Smith · 06-25-2010, 09:43 AM

Mike,
It could have something in the clutch failing and the plate be way off center.
I'm not familar with your clutch, but the old Long style and Borg & Beck I used back in the 70's would shift the pressure plate off center if a stirup or a hat hold down bolt would/was failing.

Good Luck

06-24-2010, 08:17 AM	#1
Mike Voth Live Reporter Join Date: Jun 2008 Location: Buhler, KS Posts: 527 Likes: 5 Liked 57 Times in 14 Posts	Re: Nasty Vibration Got the clutch and pressure plate back yesterday. The pressure plate was out of balance by 38 grams!! We all know that these cintered iron setups warp from all the sliding, but does that usually make them out of balance?? Nothing was missing from the pressure plate, and the disc is still in one piece. Anyone ever have this issue?? The tranmission is still coming apart, hopefully tonight, but 38 grams is a TON spinning at 9000 RPM Any other thoughts?? __________________ Mike Voth 5189 GTN - 5188 GTO Voth Racing

06-24-2010, 08:38 AM	#2
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Nasty Vibration Mike, I'm sure thay told you 38 grams, but to really tell how much out it is the actual correction radius needs to be known... 38 G. 2 in from center is not nearly as much as 38 g. 8 in from center..... Still 38 G is a big number for any correction radius. That could have knocked a little extra clearance in a few other vital parts. Rear bushing and Pilot bearing as well as all bearings in the tranny come to mind.. good luck __________________ Adger Smith (Former SS) Last edited by Adger Smith; 06-24-2010 at 08:42 AM. Reason: sp

06-25-2010, 09:15 AM	#3
Mike Voth Live Reporter Join Date: Jun 2008 Location: Buhler, KS Posts: 527 Likes: 5 Liked 57 Times in 14 Posts	Re: Nasty Vibration The "lug" was welded just past center, more towards the outside of the hat than the inside. There was a small one on the opposite side that was cut off to balance properly. Something doesn't add up...without breaking a finger, etc., how can a pressure plate be that far out of balance? The mainshaft appears straight, but we'll know later today for sure when we get it back from the machine shop. __________________ Mike Voth 5189 GTN - 5188 GTO Voth Racing

06-25-2010, 09:43 AM	#4
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Nasty Vibration Mike, It could have something in the clutch failing and the plate be way off center. I'm not familar with your clutch, but the old Long style and Borg & Beck I used back in the 70's would shift the pressure plate off center if a stirup or a hat hold down bolt would/was failing. Good Luck __________________ Adger Smith (Former SS)