help with problem main thrust gone on ls2 stroker 402
Melting Slicks
Joined: Jun 2005
Posts: 3,088
Likes: 61
From: NY- 2013 Corvette Challenge Champion-2013 Index Combo Champion 2015 CC/MM Champion
St. Jude Donor '07
When I changed my motor to a LS7 block (I have an AUTO), It had a pilot bearing in it,I took it out then asked around if I should put it back in,I don't remember who it was but they told me to leave it in just in case the drive shaft goes into a wobble at high speed,I put a solid one back in without the needle bearings and that was a few years back............Paul
Racer
Joined: Jun 2005
Posts: 272
Likes: 0
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.
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.
I understand what your saying and dont know what crank he's got but I have seen more than once with a eagle 4'' crank to have come from eagle with a pilot bearing already installed. But also every auto torque tube shaft that ive seen, at the end that would sit into the pilot bearing, from the factory is cast and not machined and smaller than the id of the pilot bearing. Also the way it is set up you would think with snaprings and bolts holding the tt shaft in there would be no balloning capabilities but your only talking how many thousanths of crank endplay there normally is, so with 900 rwhp theres gonna be some flexing going on defying the odds and possibly causing it. Before the allen is tightened on the clamp if you can move the tt shaft with a prybar towards the rear of the car then it could always go the other way to. A stupid test would be to preload it toward the rear of the car and watch it eat up the opposite side of the bearing, it will happen.
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
I understand what your saying and dont know what crank he's got but I have seen more than once with a eagle 4'' crank to have come from eagle with a pilot bearing already installed. But also every auto torque tube shaft that ive seen, at the end that would sit into the pilot bearing, from the factory is cast and not machined and smaller than the id of the pilot bearing. Also the way it is set up you would think with snaprings and bolts holding the tt shaft in there would be no balloning capabilities but your only talking how many thousanths of crank endplay there normally is, so with 900 rwhp theres gonna be some flexing going on defying the odds and possibly causing it. Before the allen is tightened on the clamp if you can move the tt shaft with a prybar towards the rear of the car then it could always go the other way to. A stupid test would be to preload it toward the rear of the car and watch it eat up the opposite side of the bearing, it will happen.
Racer
Joined: Jun 2005
Posts: 272
Likes: 0
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
it only got the thrust on rear side like it was pushed to the front of the car
Race Director
Joined: May 2005
Posts: 15,960
Likes: 21
From: West Norriton PA
St. Jude Donor '08
There is a brass cover plate that protects the front bearing that can be slid up a bit.
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
If its pushed out whats the fix?
Last edited by a/c man; Aug 30, 2011 at 11:48 PM.
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
I haven't heard much about thrust bearings going out on the forum until lately. I'm sure they have but there hasn't been much discussion...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
IIR back in 97 when the LS1 first came out there was a rash of failed thrust bearings on the production engines.
Maybe someone with better connections with powertrain than I can shed some light on the cause so you can check and make sure it's not re-occouring on your builds.
Maybe someone with better connections with powertrain than I can shed some light on the cause so you can check and make sure it's not re-occouring on your builds.
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
I got a call today and my crank and block are ready they welded up my thrust on the crank and turned it and did a line home on the block looks like I'm putting it back together this week I hope it wont happen again ill be checking it real close to see what caused this thanks for all the advise so far guys
Race Director
Joined: May 2005
Posts: 15,960
Likes: 21
From: West Norriton PA
St. Jude Donor '08
I got a call today and my crank and block are ready they welded up my thrust on the crank and turned it and did a line home on the block looks like I'm putting it back together this week I hope it wont happen again ill be checking it real close to see what caused this thanks for all the advise so far guys
Hopefully, you'll have no more problems. I've only seen the thrust bearing go out in manuals in vettes since the transmission is in the rear as well as the torque converter on automatics.
Premium Supporting Vendor
Joined: Oct 2004
Posts: 23,599
Likes: 1,226
From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
I got a call today and my crank and block are ready they welded up my thrust on the crank and turned it and did a line home on the block looks like I'm putting it back together this week I hope it wont happen again ill be checking it real close to see what caused this thanks for all the advise so far guys
Premium Supporting Vendor
Joined: Oct 2004
Posts: 23,599
Likes: 1,226
From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
thank you! and just for the record Im not blaming East Texas Muscle Cars ! I changed torque tubes from a stock c5 auto to a aftermarket drive shaft shop one because I had a bad vibration and it fixed the vibration then my thrust bearing went out!
Last edited by a/c man; Sep 30, 2011 at 09:22 PM.
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
I'm passing on my RPM coupler to Scott because it is out of my car due to the jingling noise I experienced with it at idle and low RPMs and I'm getting nevious about not having one in the car....
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
ECS help!!
Doug, I have a question for you with the coupler since you have lots of driveline experience. The rear TT bushing housing can only go so far forward when seated in the TT housing. So is the forward movement transfered from the converter driveplate through the rear bearings and forward? I'm just trying to get a handle on this.
I'm passing on my RPM coupler to Scott because it is out of my car due to the jingling noise I experienced with it at idle and low RPMs and I'm getting nevious about not having one in the car....
I'm passing on my RPM coupler to Scott because it is out of my car due to the jingling noise I experienced with it at idle and low RPMs and I'm getting nevious about not having one in the car....
Drifting
Joined: Jul 2007
Posts: 1,352
Likes: 19
From: In a house
suks
well lost oil pressure and pulled my motor to find the main bearings gone on the thrust looks like something pushed the crank forward till it eaten the main thrust bearings no other damage to the motor its a A4 car with A&A ysi kit. im afraid to put it back together until i see what caused it? anyone ever seen this? thanks scott
Last edited by jmoody66; Oct 2, 2011 at 11:57 PM.
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
It is alway something for sure...