I am 100% sure mine didnt have one in it from me doing a total pull out from the bellhousing and spline and c6 z06 cradle swap out less than 2 months ago.

 

I had a problem getting my torque tube bolted on and it turned out to be the pilot bushing.I had to borrow a special puller to get it out and then everything slid in.I hope you have found your problem.

 

thanks for that info brother very helpful etmc said it should not make any difference my rpm driveshaft was the problem

 

I put a 3in driveline driveshaft back when I did all my work..

 

Interesting... We will give them a call tomorrow... FWIW the propshafts and couplers we sell are manufactured by The Driveshaft Shop, the same supplier most vendors here use. The DSS has sold many of these shafts over the last few years.

 

thanks i know the rpm stuff in my car is top notch and not the problem here.....

 

I'm open to discussion and would love to hear their thoughts. If they believe the shaft is the issue it needs to be sent back to DSS for inspection. I would hate to see the issue reappear.

 

You absolutely couldn't get more professional than this!

 

FYI, when my Z06 was converted to A4, the pilot bearing was left in the crank. I put 2 years and thousands of hard miles on it, until eventually having a rod failure.

 

One of the best vendors in this forum for sure here.... Robert

 

Not that fimallar with pilot breaings but is it localed on the back of the engine????


Did'nt realize that's a crankshaft is it?????

 

All this is great info for all of us, sorry it took out your engine to bring this to light.

 

I don't think the OP knows what took out his engine thus far... Speculation at this point.

 

Exactly

same thing we have seen also. just like on this car

here is ALL THE FACTS:

Scott brought this car to use cause the previous builder didn't build it right. motor had a TON of piston slap.

motor cam out and bored 5 more to true it up.
bearings were changed. same CRANK, and RODS were used. all parts balanced.
WE then put 500 break in miles on it and then scott had about 3-400 more before HE
change the Tq tube, prop shaft, and a ton of other parts on his own.
before all this motor had great oil pressure and made over 900 to the ground on peak power. car also made a few 9.80s runs at over 140 MPH. For whatever reason the new parts installed (well used parts) were a little different and didnt quite fit his car right it looks like. Im not blaming the aftermarket parts just saying what caused the issue.

Now after all those parts were changed (not buy us) now oil pressure issues and other issues start to come up, and when the motor was brought back to use we noticed that the crank shaft was pushed forward, this was NOT how it was installed and built in our shop. and this motor had perfect clearances with the stock Tq tube and all stock parts.
Remember guys just cause a shop builds the car does not mean they do all the work. alot of people like to work on there own cars for the fun of it and to save time also. It really SUCKS big time when something happens like this but it was not done in our shop and we didnt do the work that caused the failure.

EVEN THOUGH WE DIDNT do the recent work that cause the issue, we are still going to help him out. Great customer great guy and i hate seeing anyone with a broke car.

 

yep and we have seen them that way also. this really sucks.
i wish we would have done the tear down, it is at the owners house, he did it, BUT some good measurements compared to the Tq tube he pulled and the one in there would be a good place to start....

Problem is He swapped so much out at the same time. and it was all used parts. wasnt just a prop shaft swap, it was a whole Tq tube and prop shaft and other parts, so there could be many things to look at here. i know we have used many DSS prop shafts and not had a issue with them, so i think it could be on something else on the TQ tube or in the new drive line that was installed.

Scott i forgot to ask you did you sell your Tq tube and prop shaft and all? would be great to got some EXACT measurements on this one that was in your car and the one we had in there, take them all apart and measure everything so you can figure out exactly what was longer........

 

Scott, sorry to see you're down and out again. But you'll be back...

 

I changed drive shafts because the stock one was shacking the car bad vibration thats the only thing changed but etmc said they will help!

 

well we know its something behind the motor that pushed into it, but why, need to figure out what part it was on the driveline you installed that did this. then compare to your old driveline as there was zero issues with that. Really sucks that this happened Scott! just hope you figure out what did it before you put this new motor back in. need to find out before it goes in, no guessing what it is or "IF" it is fixed, don't need to ruin another good motor :-(. TO MUCH DANG WORK TO GET ONE OF THOSE OUT OF A VETTE ISNT IT!?!?!?!?!?!?!

 

 

Why would ETMC install the pilot bearing in the crank in the first place is probably a good question. Every aftermarket crank I have seen brand new in the box does not have a pilot bearing installed in it, unless the crank was used, or the engine builder installed it in there because they did not know the proper application. If it is a 402 it is obviously not a stock 3.622 crank unless a used LS7 crank was used. Not that I am saying ETMC did that, just pointing out the only reason there should be a pilot bearing in it. Even then, in that case it would be a C6 pilot bearing and not a C5.

The entire problem with the C5/6 drivetrain from the flywheel back is, it is all speculation, because once you know you have to take it apart, then you are stuck letting it cool down, then removing the parts one by one, taking away the evidence/actual measurements that is needed to conduct the proper autopsy.

Too many questions and not enough hard facts to answer the questions.