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Join Date: Sep 2003
Location: Los Altos, CA
Posts: 483
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Flywheel Differences 84-86 and 87-89
I have been struggling with a problem. I have recently built up a 911 spec car with an 89 engine and an 86 915 transmission. I resurfaced a flywheel I was told was an 86 and bolted it up with a new clutch disk and aluminum pressure plate. The engine runs great. The problem is that my clutch will not disengage.
I pulled the engine out and fixed a few things that were minor and put it back in, no change. So I pulled the engine out again last night and verified all of the part numbers in my stackup. The disk and the pressure plate are correct, however the number on my flywheel shows: 930 102 233 0R According to the parts list, it appears I need 930 102 033. Does anyone know what the differences between these flywheels are? Is there a step in the 033 between the PP mounting surface and the clutch surface? My pilot bearing bolted to the end of the crank, so I am a bit confused if I have the wrong flywheel or not. Please help! Thanks! Chris |
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08-11-2011, 08:02 AM
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Join Date: May 2005
Location: Cridersville, OH
Posts: 1,879
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I'm sure others will chime in, but I believe the 915 flywheel is flat and the g50 flywheel is stepped.
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75 911 Indian Red- RUFWAN2B 2000 Boxster 2000 & 2007 Dobies www.stahlwerks.com Cages and preparation for your Porsche “People who never make mistakes must get tired of doing nothing” Bill : The origin of the orgy of Porsche |
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08-11-2011, 08:07 AM
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Location: Los Altos, CA
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Here are some pictures of what I took off... The flywheel looks like the right one, but the number on the back is not correct....
      Thanks, Chris |
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08-11-2011, 08:32 AM
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Location: Cridersville, OH
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Looks right to me. Are you sure you had the throw out bearing and the clutch ARM engaged right.
__________________
75 911 Indian Red- RUFWAN2B 2000 Boxster 2000 & 2007 Dobies www.stahlwerks.com Cages and preparation for your Porsche “People who never make mistakes must get tired of doing nothing” Bill : The origin of the orgy of Porsche |
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08-11-2011, 11:18 AM
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Join Date: Sep 2003
Location: Los Altos, CA
Posts: 483
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Not the flywheel!
So, my dad took everything down to Rick at Jerry Woods Enterprises and was told that everything was the right part number and looked good. Apparently, the 233 is the casting number and it is the same casting number for the 84-86 and the 87-89 flywheels. Great....
So, we brought everything back home and tried to add each piece one at a time to the stack testing for movement along the way. When we put the clutch disk on the splines, it would get stuck easily if cocked even slightly to one side. Turns out there were burrs on the input shaft. We filed them down and made sure that the clutch ran nice and easy over the shaft. Now it is impossible to bind on the shaft.. We put everything together in the stack and attached the transmission to the engine. We put the transmission in gear and made sure that the output flanges could not be turned. Then we put just the small arm on the throwout shaft and used a 3/4" pipe over it to actuate the lever. Wadya know, the output shafts could move, proving the clutch is disengaging! Has anyone seen this issue before? I want to make positively sure that this is the issue before we install the engine for a 4th time....  Thanks! Chris |
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08-11-2011, 09:43 PM
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Join Date: Sep 2003
Location: Los Altos, CA
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Anyone? Help me please confirm if this could be the issue before I put the engine in a fourth time...;-)
Thanks, Chris |
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08-12-2011, 07:36 AM
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