quinntard

I use my 79' as a daily driver, but I mainly only drive to and from school (about 5 minutes away). I drove it last night and it did fine, other than idling a little to high. Well this morning, i leave for school and all seems well until I hit 4000rpms. Everything began to vibrate especially the gear shifter (5 speed) and, what feels like, the TT. The torque tube was replaced by the previous owner about 2 years ago because someone had decided to do some donuts. I've searched and searched, and finally found the same problem, but it was with a 944. The guys on there said to check the balance shaft sprockets. Are there balance shaft sprockets on the 928? Where are there? Any other suggestions? Thanks for any help

James Bailey

No balance shafts on a 928 it has four more cylinders which balance it......

PHIL928

Motor mounts!

James Bailey

not going to change that much that quickly....guess again

PHIL928

Okay I'll play!

Clutch plates mounted 180 degrees wrong?

Wouldn't that show up as soon as the torque tube was changed?

James Bailey

Most likely a clutch torque tube issue..... maybe the front torque tube bearing and carrier has walked back into the tube ??? not too uncommon.

quinntard

Do you think it would happen so sudden?

James Bailey

depends on what happened.....but odds are it is clutch tube related...

uncre8tv

Same in all gears? Tried revving in neutral?

Bilal928S4

Doesn't the 79 also come with a shock to stabilize the engine in addition to the motor mounts? Maybe one of the bolts anchoring that worked lose?

quinntard

It does it in all gears and when i rev the engine in neutral, the gear shifter vibrates quite profusely

James Bailey

Does it change when you depress the clutch pedal all the way ???

quinntard

For some reason i never thought of trying that...and yes it does. It is revs just like normal when i depress the clutch.

AO

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Bad Torque Tube. Sorry. Not super expensive, but not super cheap either. The bearing carriers have migrated and are no longer supporting the drive shaft. I would recommend Constantine's solution. I should have done it myself, but I got cheap. Wish I done it.

James Bailey

You do realize that you should not try to drive it this way. You already took out the clutch arm plastic bushing possibly the guide tube and pilot bearing......you can also break the short clutch shaft which is now a $600 or so part. So park it until you can fix it.