*cliffs at the end 
*
Well a few weeks ago I went down to the drag strip because I had finally worked out all the problems and the maft-pro had been running fine for a few weeks prior. I made three passes, all of them were horrible. I blew apart the upper IC piping in the first two and the third I missed the shift from second to third... and also broke my car. I missed the shift to third and immediately pushed the clutch back in put it in third, and popped the clutch out. During this transition, I heard slight *grind* (miss) followed by a quick high pitched *clunk* when it went in. I was working the pedal pretty fast, so it sounded like one *grind clunk* sound.
Immediately after the run the car was shaking, so I limped it over to the nearest parking spot and took a look at everything I could in the dark, checked all the codes, etc. I couldn't find anything wrong with it other than the obvious shaking (like something is off balance). I limped it home that night (which wasn't too far away) and tested clutch/rpm/other dependencies. It was not dependent on the clutch or gear at all. It was not load dependent. It was however heavily RPM dependent. When I got home, at idle it had a fairly audible tapping coming from where the engine meets the transmission. I parked it for a while since I had a bunch of tests coming up.
I finally got around to looking at it today and this is what I found:
You can see the cracked bulge pretty well in the picture, but there is also a single crack that runs the whole length of the bell housing horizontal in the picture and up on to where the engine mounts to the bell housing.
In this picture you can see where the pressure plate has hit along the bell housing. If you put your fingers in there, the gap between the pressure plate and the bell housing is very small.
As far as I can tell, the clutch still works fine, the transmission still shifts fine, it's just the pressure plate and bell housing. All things considered, I think the pressure plate got a little loose and then, with all the pedal working and extreme conditions, the hardware gave out. I don't think it's the flywheel because the starter still works fine.
This is as far as I've gone today, and I will probably be pulling the transmission out this weekend to see for sure what happened and what will need to be replaced. Worst case scenario: transmission shaft bent. Best case scenario: all I have to replace is the bell housing and some hardware.
*cliffs*
Took the supra to the strip, missed third, pressure plate busted and cracked bell housing.
Edit:
This last weekend I was finally able to take the transmission out and see what really happened. Turns out the pressure plate casting broke and tore out a huge chunk of the bell housing. I got everything put back together and I'm back on the road again.
Here is what I saw when I tore everything apart:
*Well a few weeks ago I went down to the drag strip because I had finally worked out all the problems and the maft-pro had been running fine for a few weeks prior. I made three passes, all of them were horrible. I blew apart the upper IC piping in the first two and the third I missed the shift from second to third... and also broke my car. I missed the shift to third and immediately pushed the clutch back in put it in third, and popped the clutch out. During this transition, I heard slight *grind* (miss) followed by a quick high pitched *clunk* when it went in. I was working the pedal pretty fast, so it sounded like one *grind clunk* sound.
Immediately after the run the car was shaking, so I limped it over to the nearest parking spot and took a look at everything I could in the dark, checked all the codes, etc. I couldn't find anything wrong with it other than the obvious shaking (like something is off balance). I limped it home that night (which wasn't too far away) and tested clutch/rpm/other dependencies. It was not dependent on the clutch or gear at all. It was not load dependent. It was however heavily RPM dependent. When I got home, at idle it had a fairly audible tapping coming from where the engine meets the transmission. I parked it for a while since I had a bunch of tests coming up.
I finally got around to looking at it today and this is what I found:
You can see the cracked bulge pretty well in the picture, but there is also a single crack that runs the whole length of the bell housing horizontal in the picture and up on to where the engine mounts to the bell housing.
In this picture you can see where the pressure plate has hit along the bell housing. If you put your fingers in there, the gap between the pressure plate and the bell housing is very small.
As far as I can tell, the clutch still works fine, the transmission still shifts fine, it's just the pressure plate and bell housing. All things considered, I think the pressure plate got a little loose and then, with all the pedal working and extreme conditions, the hardware gave out. I don't think it's the flywheel because the starter still works fine.
This is as far as I've gone today, and I will probably be pulling the transmission out this weekend to see for sure what happened and what will need to be replaced. Worst case scenario: transmission shaft bent. Best case scenario: all I have to replace is the bell housing and some hardware.
*cliffs*
Took the supra to the strip, missed third, pressure plate busted and cracked bell housing.
Edit:
This last weekend I was finally able to take the transmission out and see what really happened. Turns out the pressure plate casting broke and tore out a huge chunk of the bell housing. I got everything put back together and I'm back on the road again.
Here is what I saw when I tore everything apart:
Last edited:
