 Flywheel replace?, when do you need too? |
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| eg914 |
 Jan 12 2009, 01:30 AM
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#1
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Member  Group: Members Posts: 319 Joined: 17-June 04 From: Elk Grove, CA Member No.: 2,223 Region Association: None  |
Pulled the trans for an oil seal replacement, and my clutch disc is down to the rivets on the pressure plate side. I thew in an old disc to keep me going (daily driver).
My question is, can I reuse the flywheel I have, or does it need to be resurfaced or replaced? How can I tell if the flywheel is OK to use as it is? Seems like the Pelican and AA kits can include flywheels, but that adds a bit to the cost. Just trying to figure out what the hit to the budget is going to be. Thanks |
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| southernmost914 |
Jan 12 2009, 08:06 AM
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#2
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KEY WEST/HAVANA Tunnel Authority Group: Members Posts: 338 Joined: 16-October 07 From: Key West/ St. Augie, Fl USA Member No.: 8,234 Region Association: South East States 
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You should at least resurface it to keep it from grabbing and smooth operation. Keep in mind these are 30+ year old flywheels and most likely have been machined before. I do not know the specs but you would have to spec it after machining. It better and cheaper in the long run to do it right than do it twice. (IMG:style_emoticons/default/biggrin.gif)
Steve |
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| So.Cal.914 |
Jan 12 2009, 08:50 AM
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#3
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"...And it has a front trunk too." Group: Members Posts: 6,588 Joined: 15-February 04 From: Low Desert, CA./ Hills of N.J. Member No.: 1,658 Region Association: None |
Just make sure the face has not been cut so much that the clutch disc center rubs on the F/W center bolts.
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| eg914 |
Jan 12 2009, 10:45 PM
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#4
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Member Group: Members Posts: 319 Joined: 17-June 04 From: Elk Grove, CA Member No.: 2,223 Region Association: None |
Thanks for the replies. Guess I will have to spend the bucks for a flywheel. I can't afford much down time when it comes to replacing the clutch. The flywheel is in the car now, and I probably won't have time to get it surfaced locally.
If I install a different flywheel will I need to check the end play of the crankshaft, or is that flywheel independent? |
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| So.Cal.914 |
Jan 13 2009, 01:27 AM
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#5
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"...And it has a front trunk too." Group: Members Posts: 6,588 Joined: 15-February 04 From: Low Desert, CA./ Hills of N.J. Member No.: 1,658 Region Association: None |
I would check it for sure.
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| Mark Henry |
Jan 13 2009, 06:48 AM
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#6
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
You must check the end play if you change flywheels, good thing to check even with the same flywheel. You also should replace the flywheel seal and O-ring. If you have your ducks in a row with a good machine shop they should be able to grind your flywheel while you wait.
I wouldn't do it now, but on a tight budget I've reused a flywheel as long as the friction surface is flat (using a straightedge) and not glazed or burnt. BTDT |
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| Jake Raby |
Jan 13 2009, 07:26 AM
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#7
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
QUOTE(Mark Henry @ Jan 13 2009, 05:48 AM)  You must check the end play if you change flywheels, good thing to check even with the same flywheel. You also should replace the flywheel seal and O-ring. If you have your ducks in a row with a good machine shop they should be able to grind your flywheel while you wait. I wouldn't do it now, but on a tight budget I've reused a flywheel as long as the friction surface is flat (using a straightedge) and not glazed or burnt. BTDT Yep, what Mark said... Post some pics of it and I can tell you whether it has another "life" left in it for machining (more than likely) |
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| Porsche Rescue |
Jul 8 2009, 05:39 PM
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#8
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Saving and Enjoying Old Porsches Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None |
Jake, can you tell from this pic if the flywheel can be turned? I believe it only has 110K on the engine and I can't tell if it has ever been turned.
There is a deep groove on the outer circumference of the contact surface. It matches the light colored ring, about a 1/4" wide on the outer circumference of the disc. Since there are no rivets out there, I can't figure what made the ring. Clearly the flywheel should have been turned before this disc was installed.   |
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| Jake Raby |
Jul 8 2009, 08:14 PM
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#9
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
It looks low, but **may** have one more life in it... Have it measured.
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| Porsche Rescue |
Jul 8 2009, 10:58 PM
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#10
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Saving and Enjoying Old Porsches Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None |
Can you tell me the spec? Search here is unclear. Some say 11mm (disc surface to mounting surface) and others say 7-8mm. I know the plate mount surface and disc surface must be maintained at 22.5.
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| JFJ914 |
Jul 9 2009, 09:31 AM
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#11
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Senior Member Group: Benefactors Posts: 813 Joined: 13-June 03 From: Alpharetta, GA Member No.: 814 Region Association: South East States 
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You will probably be ok as long as there is still a "step" left from the working surface toward the inner atachment.
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