Where did this come from?

[jqdp]

Pretty sure its from the Crankshaft but not 100% certain where she sits. 1969 cl350

How do i know when the time to replace the bearings has come? Mine spin free and clean but was thinking of bringing them down to a local shop to have them take a gander. Thought some insight couldn't hurt. Cheers

 

[AlphaDogChoppers]

I see corrosion. Replace them. They are like $8 at a bearing supplier.

 

[Hoosier Daddy]

Yep, that brown grease is actually rust. May even feel smooth but it's toast.
See if you got a Motion Industries in your area and take them the number thats stamped on the race.

 

[Bert Jan]

When you tear an engine down to this, IMHO its just plain stupid not to change them. Listen to ADC.