 914 v8 clutch failure, Newly installed Boxster S trans |
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| theer |
 Oct 20 2024, 09:10 AM
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#1
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Senior Member  Group: Members Posts: 684 Joined: 31-July 15 From: Dover, MA Member No.: 19,014 Region Association: North East States 
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We had our 914 LS2 track car out this weekend and shredded two clutch discs in a matter of a few laps each time.
We just replaced the 4-speed 930 trans with a 6-sp Boxster S trans and had high hopes for some fun. Sadly, the first (almost new) clutch failed spectacularly, with shredded friction material inside the Bell housing… interestingly, only the pressure plate side was gone. As in completely missing. The flywheel side looks fine. Replaced it with a spare and it didn’t last. Haven’t taken it apart again, but suspect the same thing. I’m guessing the custom clutch disc is a fraction too big and rubbing on something on the PP side. Any ideas? Some pictures for your amusement:    |
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| Chris914n6 |
Oct 20 2024, 01:27 PM
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#2
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Jackstands are my life. Group: Members Posts: 3,405 Joined: 14-March 03 From: Las Vegas, NV Member No.: 431 Region Association: Southwest Region |
Imma guess the disc isn't touching the flywheel because you put it on backwards.
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| dakotaewing |
Oct 20 2024, 03:49 PM
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#3
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Senior Member Group: Members Posts: 1,163 Joined: 8-July 03 From: DeSoto, Tx Member No.: 897 Region Association: Southwest Region
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Theer,
Can you provide details regarding the flywheel, clutch disc, and pressure plate? Meaning, Brand and serial / model # for each? There literally hundreds of choices for this combination, and general info / or type does not really work when trying to sort failure issues. Thx |
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| JOEPROPER |
Oct 20 2024, 05:20 PM
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#4
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The answer is "no" unless you ask... Group: Members Posts: 1,191 Joined: 21-November 15 From: White Plains New York Member No.: 19,387 Region Association: North East States
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Imma guess Chris914n6 is correct...
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| sixnotfour |
Oct 20 2024, 06:31 PM
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#5
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914 Wizard Group: Members Posts: 10,584 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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not enough free play at slave cylinder.
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| ejm |
Oct 21 2024, 09:10 AM
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#6
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I can see the light at the end of the tunnel Group: Members Posts: 2,703 Joined: 3-February 03 From: Massachusetts Member No.: 224 Region Association: None |
Is the main shaft riding correctly in the pilot bearing?
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| theer |
Oct 21 2024, 10:39 AM
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#7
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Senior Member Group: Members Posts: 684 Joined: 31-July 15 From: Dover, MA Member No.: 19,014 Region Association: North East States
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Thanks everyone- pretty sure we put it in correctly both times, but will verify.
EJM might be onto something… the only change was the Boxster trans replaced the 930 trans, clutch, PP are the same. Could be the Boxster input shaft is too short… or the pilot bearing (which was fine for the 930) is too big for the Boxster end. I’ll report back once we have it apart again. |
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| rick 918-S |
Oct 21 2024, 10:58 AM
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#8
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Hey nice rack! -Celette Group: Members Posts: 20,723 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region
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I tried to zoom in on the input shaft but the Pic got blurry. In the blurry photo the end of the shaft look rough. Maybe just the photo.
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| rick 918-S |
Oct 23 2024, 05:10 AM
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#9
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Hey nice rack! -Celette Group: Members Posts: 20,723 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region
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I would be very interested in seeing the flywheel and adapter you are using for the Boxster swap. I looked for a build thread but did not see one.
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