Thrust bearing clearance problems!!!
Thrust bearing clearance problems!!! I am getting frustrated with my 408, I am assembling the motor and having problems with the thrust bearing. As soon as I start to torque down the #3 cap with the thrust bearing the crank will no longer spin AT ALL. The sides of the thrust are stopping it from moving, sort of like it is wedging against the crank. I keep taking a little off the sides of the bearing and it is getting better but Im not going to have much left if I keep going at this rate. Anybody ever have a problem like this? Also I am running a iron block with a aftermarket crank and clevite HX bearings.
Any insight would be greatly appreciated.
Thanks
Any insight would be greatly appreciated.
Thanks
Did you set the thrust bearing? Before you torque down the cap, you have to hit the snout of the crank to move it rearward, then hit the rear flange to move it forward. Give it a good smack, preferrably with a brass drift and mallet or something soft so as not to damage the crank.
Did you set the thrust bearing? Before you torque down the cap, you have to hit the snout of the crank to move it rearward, then hit the rear flange to move it forward. Give it a good smack, preferrably with a brass drift and mallet or something soft so as not to damage the crank.
When I pull the caps down against the crank I see if it will spin, then I give it a couple whacks and check it again, after I set the thrust it spins nice and free until I start to torque it down.
Yes, I have been hitting the crank. I put the crank in then I pull the caps down then I give a good smack forward them back, then I finish torquing them down.
When I pull the caps down against the crank I see if it will spin, then I give it a couple whacks and check it again, after I set the thrust it spins nice and free until I start to torque it down.
When I pull the caps down against the crank I see if it will spin, then I give it a couple whacks and check it again, after I set the thrust it spins nice and free until I start to torque it down.
It's an eagle. I'll have to measure the crank in the morning. Its just a little wierd, this was a running motor and I didnt like the way the clearances were set. The bearings were already trash after some track passes and 100 miles. But, the thrust bearing looked fine on the sides. I have tried two different thrust bearings so far with no difference.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
I took a grinder to the crank.
J/K LOL
I ended up having to take more off of the sides of the thrust. There was still plenty of bearing left so I think it will work good.
J/K LOL
I ended up having to take more off of the sides of the thrust. There was still plenty of bearing left so I think it will work good.
Be careful, take too much and you'l trash that thrust surface. It's gotta have those grooves in there to get oil.
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
If you had it line honed they may have jacked up the cap or leaned it. I have not really had that problem so its not that common if you are doing things right but then I don't use Clevites on mains either on LS1s. Maybe they are better nowadays?
I used FM bearings the first time around and didnt have problems, probably should have used them again. These are billet mains and that was the only issue I had everything else was perfect.
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
If you sand the front of the cap side of the thrust bearings you should be fine but I wouldn't sand the rear where it actually takes thrust much. Still if straight it should be close but good luck. Is it a manual or auto car?
