85 Euro Flex plate ?
02-01-2009, 03:43 PM
#17
Team Owner
you would want to move the flywheel fully aftn then tighten the front pinch bolt. this will give it more room to move forward.
Also note the front bolt is the last one to tighten , do the rear bolt first
Also note the front bolt is the last one to tighten , do the rear bolt first
02-01-2009, 04:20 PM
#18
Former Vendor
Join Date: Feb 2004
Posts: 2,139
Likes: 0
Received 0 Likes
on
0 Posts
Hi Bill,
The circlip, bearing and washers were stopped being installed sometime in MY 1984, according to the WSMs. 85s and later should not have them unless someone installed them later and as you know only for the older 25mm constant diameter driveshafts. The newer 28mm necked down drive shafts don't have the necessary front area on the drive shaft to install them. Wonder why...
As far as your experiences with just relieving the tension every so often, consider yourself fortunate. Others have not been so lucky.
Cheers,
Constantine
The circlip, bearing and washers were stopped being installed sometime in MY 1984, according to the WSMs. 85s and later should not have them unless someone installed them later and as you know only for the older 25mm constant diameter driveshafts. The newer 28mm necked down drive shafts don't have the necessary front area on the drive shaft to install them. Wonder why...
As far as your experiences with just relieving the tension every so often, consider yourself fortunate. Others have not been so lucky.
Cheers,
Constantine
02-01-2009, 05:18 PM
#20
Under the Lift
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Bad memory. It's in the 85 service info guide, so I keep remembering it as 85. Didn't the 25mm shaft with groove continue for a few years after the shims were discontinued? [EDIT: I see mention of the changeover from 25 to 28mm shaft in 89 service guide].
02-01-2009, 05:31 PM
#21
Inventor
Rennlist Member
Rennlist Member
My '81 had shims/circlip, and the flexplate still moved when I released the pinch bolt (for the first time, just before I sold it 
).
I think it's torque that's a factor, not HP. My '81 was up to ~270 rwtq (but only ~210 rwhp).
AFAIK, all 25mm shafts have a circlip groove.
).I think it's torque that's a factor, not HP. My '81 was up to ~270 rwtq (but only ~210 rwhp).
AFAIK, all 25mm shafts have a circlip groove.
02-01-2009, 07:11 PM
#22
Former Vendor
Join Date: Feb 2004
Posts: 2,139
Likes: 0
Received 0 Likes
on
0 Posts
Hi Bill and Ken,
Yes, Porsche kept using the 25mm drive shaft for awhile longer than 1984 but discontinued the use of the circlip, washers and bearing. Your right Ken, all 25mm drive shafts have the groove and the extended portion.
Yes, torque is the factor and is the reason why Porsche went to the thicker 28mm drive shaft. Surprisingly they did not change the couplers at the front and rear flexplates which meant they had to neck down the 28mm shaft, introducing a shear point in the drive shaft. And it still did not control the pull out problem at the front.
Cheers,
Constantine
Yes, Porsche kept using the 25mm drive shaft for awhile longer than 1984 but discontinued the use of the circlip, washers and bearing. Your right Ken, all 25mm drive shafts have the groove and the extended portion.
Yes, torque is the factor and is the reason why Porsche went to the thicker 28mm drive shaft. Surprisingly they did not change the couplers at the front and rear flexplates which meant they had to neck down the 28mm shaft, introducing a shear point in the drive shaft. And it still did not control the pull out problem at the front.
Cheers,
Constantine