I questioned Clevite about the light colored main bearing and they responded
telling me it was ok to use, that the flash tin sometimes runs if the equipment is not calibrated correctly and to just wipe it off. It does not wipe off. Is this ok?
Hard to tell from the lighting if they are coated or just "H" bearings with oil on them.
Almost looks like a set of "H" bearings with one "P" or "V" type lower!?!
I agree, check the part number on the back of the "ligter" bearing,, I would guess it's a "P". I assume there is oil on the bearings for some reason due to the reflection of what looks to be flourescent light tubes in them.
They are all stamped MB 2404 H, I installed the crankshaft then got nervus and removed it, it is 50wt valvoline on them.
Qoute from Clevite: That is the correct piece. The silver color is flash tin plate to protect the bearing thrust surface during start-up. It is not suppose to be on the face of the bearing, but only on the flange. They use an anode in the plater to prevent such from happening, but once in a while it is not adjusted perfectly the plating strays. It will cause no problem what so ever, but if you care to remove it, wipe it with a piece of newspaper.
Me;It do'nt wipe off
Clevite; We see minor variations in the plating fairly frequently, but in your case as an individual user of our bearings it could be a once in a lifetime event, hence the difference in our levels of concern.
Inspect them closely again, only the rears will be 2404, the other 4 pairs will be 2403.
What color is the back side of the bearing? The "H" bearings are usually a copper color on the backside, the "P" bearings the same sort of grey/silver as the front of the one in your photo. If you were feeling really adventurous, you could use a knife to scrape a NON CONTACT AREA of the bearing, the radius will never touch the crank. You may be able to feel the difference in hardness between the two.
Bottom line, if you are concerned with it, take it back to where you bought the set and get them to give you another shell. I would like to see clear photos of the backside of both of the rear bearings showing the part number and color.