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Registered
Join Date: May 2002
Location: Columbia, SC
Posts: 274
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Correct tool for flywheel bolts?
I could sure use some help from a more experienced porsche wrench. I have an early 911 motor w/ 215mm six bolt flywheel. The bolts look like a 12 point socket head. Does this require a serrated wrench? If so, what size and is this a common tool? It doesn't look like something your average auto parts store would carry. Thanks for any help.
Dan |
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07-03-2002, 07:40 AM
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Join Date: Jul 2001
Location: Springfield, MO
Posts: 1,422
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I would try the average auto parts store to see if the carry the K-D line of speciality tools. You can find the bit there.
Good luck, David Duffield |
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07-03-2002, 08:09 AM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,492
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Got mine at Sears.
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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07-03-2002, 08:39 AM
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Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
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Tool is sometimes known as a 12mm triple square; it is not a torx bit. Clean out the bolt heads well and keep the tool well seated while you loosen the screws. You do know these flywheel screws are one time use items; you'll need to use new ones when you reinstall the flywheel. Jim
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07-03-2002, 08:50 AM
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Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Some sources call the tool an XZN drive bit, others refer to it as a 'Polygon Drive' ... it is an internal-wrenching European aerospace standard design. It is in the same 'family' as the smaller bolts used on some CV-joints by VW and Porsche. The designation is by thread size, so I have the 'M8' bit for CV-joints and the 'M10' and 'M12' bits for flywheel bolts.
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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07-03-2002, 09:11 AM
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The 12 pt. 12mm star tool is also made by Lisle Tools and I've seen them at Pep Boys.
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2022 BMW 530i 2021 MB GLA250 2020 BMW R1250GS |
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07-03-2002, 09:35 AM
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Join Date: May 2002
Location: Columbia, SC
Posts: 274
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Thanks for the help guys. Found it just as you called it. The right tool for the job makes things a snap. Thanks also to you Jim, as I did NOT know these were one time use. I knew some of the internals were (rod bolts and such). I'm a newbie on porsche engines so expect some more basic questions. I'll try to do a little research before I spring to many on you. These porsche engines are just SO much more interesting than the big V-8s I grew up on. You really have to mind your p's & q's. Thanks again for the help (direct and indirect, I'm learning alot from the postings).
Dan Thomas 
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07-03-2002, 06:49 PM
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Only Porsche
Only bike
