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I'll start by talking about the background of the car. Its a 92 Z34 5-Speed that I bought a few years back with the intention of using it as a parts car in converting my GTP into a 5-Speed.
[img]ftp://142.162.135.171/Z34/z34_in_cb.JPG[/img]
The owner of the car didnt know why it wouldn't start anymore only to say something was jammed up in the ring gear causing the motor not to be able to turn over. Obviously I didn't agree with this assessment but whatever, I didn't care about that because I was just after the gearbox.
Out of curiousity, once we got the car home, we popped off the timing belt inspection cover.
[img]ftp://142.162.135.171/Z34/broken_belt.JPG[/img]
About a week ago the 5-Speed swap finally began with the removal of the cradle from the Z34. That went about as smoothly as I had anticipated ending with the car slipping off the jack and falling to the floor.
So with the engine and transmission out of the car, we started tearing down the motor to further inspect the damage. Our first move was to remove the timing belt cover.
[img]ftp://142.162.135.171/Z34/cover_off1.JPG[/img]
The timing belt had wrapped around the intermediate shaft sprocket 4 times and bound up solid, explaining why the motor could not turn over.
[img]ftp://142.162.135.171/Z34/cover_off2.JPG[/img]
We pulled, pried and ultimately used a propane torch in a futile attempt to remove the bound up belt. When we determined that this was hopeless, we then attempted to remove the sprocket itself. Upon removing the retaining bolt, we noticed the sprocket was off-center, it wasn't too long after this that we figured out what had actually happened:
[img]ftp://142.162.135.171/Z34/sheared1.JPG[/img]
[img]ftp://142.162.135.171/Z34/sheared2.JPG[/img]
[img]ftp://142.162.135.171/Z34/sheared3.JPG[/img]
The final remains of the belt:
[img]ftp://142.162.135.171/Z34/belt_remains.JPG[/img]
Anyways I just thought I'd share, this is the first case I know of of a timing belt failure causing an intermediate shaft to shear off.
[img]ftp://142.162.135.171/Z34/z34_in_cb.JPG[/img]
The owner of the car didnt know why it wouldn't start anymore only to say something was jammed up in the ring gear causing the motor not to be able to turn over. Obviously I didn't agree with this assessment but whatever, I didn't care about that because I was just after the gearbox.
Out of curiousity, once we got the car home, we popped off the timing belt inspection cover.
[img]ftp://142.162.135.171/Z34/broken_belt.JPG[/img]
About a week ago the 5-Speed swap finally began with the removal of the cradle from the Z34. That went about as smoothly as I had anticipated ending with the car slipping off the jack and falling to the floor.
So with the engine and transmission out of the car, we started tearing down the motor to further inspect the damage. Our first move was to remove the timing belt cover.
[img]ftp://142.162.135.171/Z34/cover_off1.JPG[/img]
The timing belt had wrapped around the intermediate shaft sprocket 4 times and bound up solid, explaining why the motor could not turn over.
[img]ftp://142.162.135.171/Z34/cover_off2.JPG[/img]
We pulled, pried and ultimately used a propane torch in a futile attempt to remove the bound up belt. When we determined that this was hopeless, we then attempted to remove the sprocket itself. Upon removing the retaining bolt, we noticed the sprocket was off-center, it wasn't too long after this that we figured out what had actually happened:
[img]ftp://142.162.135.171/Z34/sheared1.JPG[/img]
[img]ftp://142.162.135.171/Z34/sheared2.JPG[/img]
[img]ftp://142.162.135.171/Z34/sheared3.JPG[/img]
The final remains of the belt:
[img]ftp://142.162.135.171/Z34/belt_remains.JPG[/img]
Anyways I just thought I'd share, this is the first case I know of of a timing belt failure causing an intermediate shaft to shear off.
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