thrust bearing face wear

[Grumpy]

Been a while since I don't post... meaning I did not break stuff...

Disassembled my engine this winter to change some parts I bought and found half of the thrust bearing surface was almost gone (on the flywheel side of the motor).

Luckily the bearing did not spin (I would've known from the awful noise). There is no damage to the rest of the bearing(s) or crank journals, or anything, just the bottom half the thrust surface on the bearing.

The crank thrust surface itself is OK. I lightly went with 600 grit cloth to wipe it clean and found no damage or scrathes. It has of course blueing that is more present on the opposite (un machined) side of it.. about half of the fillet, meaning of course it overheated... Crank is a forged 4340 steel piece.

Does this mean I should toss it and buy a new crank? Is the hardening compromised or am I just paranoid?

Thanks

http://garage.grumpysperformance.com/index.php?threads/unforgiven-project.15214/page-31

if you have a decent , local knowledgeable local machine shop, your dealing with,
its a very common repair, if you don,t
"have a decent , local knowledgeable local machine shop, your dealing with,"
Id suggest you find one to deal with.
they simply weld a bit of metal as required and grind the surface back to spec..
.including the bearing radias edge area,
certainly far cheaper than buying a new 4340 forged crank,

it sounds like your rear main cap is not seared correctly in the block or the rear main caps improperly machined
, if the crank was bent or improperly machined the whole thrust bearing,
not 1/2 would be damaged,
ID suggest the block be checked carefully by an experienced engine shop machinist

https://www.thomasnet.com/products/crankshaft-repair-services-20921979-1.html

http://garage.grumpysperformance.co...haft-thrust-bearing-trashed-in-1-2-hour.5141/

http://garage.grumpysperformance.co...gine-block-main-cap-movement.6162/#post-19172

http://garage.grumpysperformance.com/index.php?threads/scat-cranks-related-info.10930/#post-74729

http://garage.grumpysperformance.co...ain-seal-in-a-gen-i-chevy-v8.1718/#post-38702

http://garage.grumpysperformance.com/index.php?threads/finding-a-machine-shop.321/#post-55314

http://garage.grumpysperformance.co...uring-crank-bearing-journals.5478/#post-16429

http://garage.grumpysperformance.com/index.php?threads/thrust-bearing-wear.619/

http://garage.grumpysperformance.com/index.php?threads/rotating-assembly-bearings.9527/

http://garage.grumpysperformance.com/index.php?threads/bearing-crush.10213/

http://garage.grumpysperformance.com/index.php?threads/bearing-clearances.2726/

http://garage.grumpysperformance.co...tion-of-crank-durring-short-blk-assembly.852/