dragonrob

Hi everyone I'm new to this forum. I just finished the front end rebuild and I start the car up and I heard a loud bang so I shut it off .i looked at the engine and all was OK.i dropped the fly wheel cover and all looks fine.now the car will not move forward or back.i dont know if the trans just went ? I would very much appreciate any ideas as what to check? Rob.

OTR18WHEELER

Hello, and welcome to rennlist.
I may not be of much help yet, but I have an idea.
You said you dropped the flywheel bottom housing and did not see anything.
Did you inspect the front flex plate for any cracks?

I think you should check the rear shaft connection at the rear flex plate also.

It is more likely the problem is forward of the transaxle.

with the rear wheels off the ground, and the engine OFF, shifter in park, can you rotate the wheels by hand?
if no, then shift the selector to Neutral and try to rotate the wheels. listen for any grinding type noise.

MainePorsche

Welcome to the Tank.
Sorry your first post on the Forum is so inauspicious.
More information is needed.
How was the car functioning prior to your work ? Not just the trans function, but the engine function too.
What work did do on your front end rebuild, and why ? Be specific.
How does the engine run now ? Idle well ? Even when allowed to idle for a while and fully warmed up ?
Crankshaft end play check is important to check, but an issue resulting in this finding would primarily effect engine function. It is something to check. See Dwayne's write up. http://dwaynesgarage.norcal928.org/
How did the trans function prior to the event ? Be specific. Fluid last serviced when ? Levels of ATF OK ?
If you know how, drain the ATF from the pan and then drop the pan. Any 'grit' in the fluid ? With a magnet, any metallic residue ? Any bits and pieces in the pan ? What color is your ATF ? It should be red and not look 'burnt'.
What happens, what do you hear, what to you feel, what to you see, what do you smell, when the engine runs and when you shift into a gear ? How does the shifter feel in you hand when you shift ? Different than when it drove ?
Report back.
Best Wishes
Craig

MainePorsche

Yes, do this.
Car up and in Neutral. Turn a wheel forward, and tell us what happens with BOTH wheels.

dragonrob

I was under the car today.It looks like the front of the TT spline is as far forward as it can get.the torque conveter looks to be resting on the housing I couldn't see the rear TTspline . just before it happened the car started vibrating a lot . I want to thank everyone for there help ! I was wondering if the TT and front of torque converter can be removed with out removing the trans ? The car was shifting fine before this happened.the wheel seem to spin correctly when I spinthem by hand.I had just finished the front ball joints, inner and outer tie rods.I also put a new timing belt and water pump .the car had been stored for a few years when I was sick thanks Rob.

ammonman

It is possible to remove the torque tube without removing the transmission, but not advisable. It is very easy to damage the torque tube shaft and/or the coupling due to the angle the shaft must make as it drops down to come forward from the trans and out. Getting the torque converter out with the trans still in the car is not possible AFAIK. There simply isn't adequate clearance to get the cover off with the trans installed. Your vibration could be from bad torque tube bearings or bad rear flex plate carrier bearings or both. The rivets on the rear flex plate that connect the flex plate to the central hub are a known failure point also. Best to plan on doing all these things and re-sealing the primary pump in the transmission while you have it out. Nothing very complicated but easiest to do it all while the trans is out. I did mine in my garage with the car up on 4 six ton jack stands and a 500lb transmission jack.



Mike

76FJ55

Not to disregard the previous reply, but I recently removed the TT and TC housing with the trans still in the car. In my opinion this is the easier route if you don't need to take the trans out for other reasons. To do this you will need to also remove the bell housing from the engine. You will need to unbolt the trans mounts and slide the trans aft. Be careful with the reservoir contacting the rear cross member.

But before you start ripping it apart there a few things that you may want to check.
First you said you shut it down immediately. Did you restart it? If not I would suggest cranking the engine over by hand a few times to make sure you don’t have anything interfering with the engine rotating.
While you turning the engine you could also have someone watch the torque converter to see if it rotates with the engine.

Next I would unbolt the front flex plate from the starter ring gear and slide the front coupler back on the splined slightly. This will allow you to rotate the front flex plate without turning the engine. Rotate the flex plate and drive shaft and listed and feel for any issues. It should rotate smooth and quit, but it will take a little effort because you are still turning the torque converter.

Based on your findings from the above test you can also unbolt the rear flex plate from the TC and slide the TC aft just slightly. Now see how the shaft rotates without turning the TC. Should again be smooth and quit and this time take very little effort

ammonman

Thanks for posting your results Simon. I didn't think removing the TC housing was possible with the trans in the car. Maybe an S4-only restriction. Great advice on separating the TT from the TC and the engine to see if everything turns freely by hand.

Mike

dragonrob

I wil try to remove the way posted here thanks for the info.right now I hope there insnt a lot of damage as the torque converter isn't spinning and theTT is the engine runs smooth now. Its been such badweather here in fl. I haven't been able to get much done . Rob