924Board.org

[porsche_reg]

'79 924 n/a 152k, well documented history, father original owner since new. At 137k in '09 replaced the clutch (original still in there as my dad is very easy on things) with a stage 2 Spec clutch. Flywheel was lightened and entire job done by a local Porsche legend.

Recently I've been daily driving her and had a number of issues (fuel leak issues and upgrades such as new control arms and many new Powerflex bushings, all new belts and hoses upfront, water pump and new alternator). Overall I feel like I'm working out issues and getting some items that tend to wear as the car sits or just ages.

Yesterday leaving a meeting I was very easily leaving a stop light shifting into second when the car felt like it was forced out of gear. This car has never done that, but I've experienced others and that was the feel sound. Tried other gears as I was in a fairly high traffic, higher speed four lane area w/o success, shifts and engine revs, but no movement and pretty bad sound apparently coming from the area nearest the engine. Rolled a little and got out and pushed the car around a corner and called AAA for a tow.

Call from shop today indicates either clutch blew up/gave up or the drive shaft is stripped. Won't know for sure until Monday.

Anyone ever heard of a clutch or a Spec clutch detonating or the drive shaft stripping like that? Any thoughts or other ideas? I'm left the weekend wondering...

If it is the clutch itself, should I just go with stock after this? I may do some track events in the future, but I don't plan on upgrading the engine significantly in the hp area, just suspension and keeping it on the road.

_________________
Prev: '81 BMW 320i
'05 997.1 C2
Current: '79 924 n/a (family owned since new)
'12 Subaru Outback

[924-76]

[porsche_reg]

thank you 924-76.

In gear, foot off clutch pedal yes. Just applying a little gas moving away from the stop light when the loud clunk happened with a slight whirring noise (loose stuff in the driveline somewhere). I pretty much threw on the hazards, tried a few gears and shut her down and pushed a little bit to a safe spot.

Mechanic (w/o opening up yet) says it sounds fine (no whirring) when out of gear and the whirring happens when put in gear and left running (car won't move obviously).

Bearing and all associated pieces replaced in '09, yes. At least I paid for them! But again, very, very trusted Porsche guy, so highly doubt any issues there. Unfortunately he's not in biz anymore, retired.
_________________
Prev: '81 BMW 320i
'05 997.1 C2
Current: '79 924 n/a (family owned since new)
'12 Subaru Outback

[porsche_reg]

one more thing, might help to remotely diagnose...

I've experienced an increasing number of clutch engagements (or is it disengagement?) and go to put in 1st with a heavy, loud crunch. So, clutch wasn't doing its job.

The increased # experienced included a very bad one pulling into the very same meeting where, after several hours, I left and experienced the catastrophic failure.
_________________
Prev: '81 BMW 320i
'05 997.1 C2
Current: '79 924 n/a (family owned since new)
'12 Subaru Outback

[porsche_reg]

found this on YouTube:

https://www.youtube.com/watch?v=YP8Lm6Emd5I&feature=youtu.be

Be interesting to find out next week what happened, while the poster doesn't go into what happened exactly, it sounds like he might have experienced the same thing I did.
_________________
Prev: '81 BMW 320i
'05 997.1 C2
Current: '79 924 n/a (family owned since new)
'12 Subaru Outback

[porsche_reg]

ok, it's the torque tube, splines stripped half way in (from my guess, half way).

What options do I have to upgrade? Could I do a '44 (early) shaft? I'm looking on car-parts.com and have some options.
_________________
Prev: '81 BMW 320i
'05 997.1 C2
Current: '79 924 n/a (family owned since new)
'12 Subaru Outback

[porsche_reg]

speaking with Constantine at Black Sea, sounds like 944 (25mm) and older, first gen 924's (~20mm) don't match. He's going to help get me in touch with some folks who might be able to help.

Thanks!
_________________
Prev: '81 BMW 320i
'05 997.1 C2
Current: '79 924 n/a (family owned since new)
'12 Subaru Outback

[Rasta Monsta]

[porsche_reg]

ok, here it is. Looks like clutch disc is destroyed, no surprise.

https://postimg.org/image/4zcvc5twb/
_________________
Prev: '81 BMW 320i
'05 997.1 C2
Current: '79 924 n/a (family owned since new)
'12 Subaru Outback

[morghen]

oh you're toast
_________________
Supercharger and EFI kits
https://www.the924.com

[Rasta Monsta]

_________________
Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[porsche_reg]

Could it just be an poor fitting clutch disc? I'm running stock in the HP category, never, ever, never dropped the clutch or put undo stress on those areas. I putt it around town...

Thanks for the interest and replies, this is facinating.
_________________
Prev: '81 BMW 320i
'05 997.1 C2
Current: '79 924 n/a (family owned since new)
'12 Subaru Outback

[Rasta Monsta]

I'd blame the disc hub first. Those driveshafts are quite hard, and I've never seen damage like that on any car.

*EDIT*

Oops, just did a Google search on Spec. They are widely derided for poor QC!
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Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[porsche_reg]

should I just go with Sachs? I don't plan on doing any major engine upgrades that would require anything stronger/more advanced.
_________________
Prev: '81 BMW 320i
'05 997.1 C2
Current: '79 924 n/a (family owned since new)
'12 Subaru Outback

[morghen]

Well you need a new torque tube before you go with anything...good luck finding one...thats an early NA dogleg isnt it?
_________________
Supercharger and EFI kits
https://www.the924.com