Mopar thrust bearing failure

[devo340]

Originally Posted by BillK

Devo,

Is this a new engine or has it run before without hurting the thrust bearing ?

The reason I ask is I had a problem with a thrust bearing in a 350 Chevy years ago. The block had been align honed and when they cut the cap they cut it crooked and it was tilting the thrust bearing just slightly. Took me a while to figure it out.

Did something change in your combination right before your thrust problem started ?

Just thinking out loud

Not a new engine. Ran the car in 2016 with no concerns. Had a trans leak, pulled it & had it looked at to be freshen. Trans guy couldn't find anything wrong. resealed it. Took it to our first race this season, lost #6 rod bearing. Had the crank ground, replaced 2 rods, new rings & intake valves. Just freshen the engine. Wasn't as fast it should have been, slowed way down after the 2nd race back. found the thrust had severe wear allowing the crank counter weight rub the main web in the block. Had the crank repaired, all the bearings looked really good. replaced bearings & oil pump. lasted for two more races, started slowing again. cut the filter apart, found bearing material. also excess movement in the crank. haven't pulled the engine yet.I still had the last oil filter from 2016. it was perfect inside. May be coincidence, started having problems after the trans was checked out.