Help!! What is this?

Eeek!!!!

Definitely resembles a thrust washer. Can you see the thrust washers without removing the cap? Might be worth digging in a little bit just for peace of mind.

 

Thats a thrust washer. Use a tire bar and try to push your balancer forward, then back. Or pry forward, and have someone push the clutch in while you watch balancer

 

You can see them. When it throws one it's usually the rear. Always wondered if it was because of folks backing into docks and riding the clutch.

Good thing to catch now, and may have been the cause of the rear main leaking.

 

He'll have to drop the cap, and roll them in.

 

The way that thing looks i hope the sides of the crank and block are ok
Probably need a whole new main bearing because I doubt the notches it hooks onto on the bearing shell will hold it right
and at that point get a whole set

 

391 ft lbs? Lemme double check first. Quick Google says 347-391