Cleaning Oil Pan

I don't know what it is, but there is a brown coating on every dipper tray I have seen. It is nearly impossible to get off except for blasting. There is a concern that the sand or even glass beads used in blasting getting under the 3 baffles where they are spot welded to the main part of the tray and later coming out when the engine is running. So, I don't think you need to try to get the dipper tray down to bare metal, just the oil off and make sure there are no rust holes (sometimes they are pretty small and hard to see).
 
I don't know what it is, but there is a brown coating on every dipper tray I have seen. It is nearly impossible to get off except for blasting. There is a concern that the sand or even glass beads used in blasting getting under the 3 baffles where they are spot welded to the main part of the tray and later coming out when the engine is running. So, I don't think you need to try to get the dipper tray down to bare metal, just the oil off and make sure there are no rust holes (sometimes they are pretty small and hard to see).

Good tip. I not going to blast the tray/baffles, just wire brush to get the darkness off.

You say a get down to the brown? and I'd be okay?
 
I sandblasted the oil pans and trays that I painted on the inside. I tap on the trays and baffles with a small hammer to knock out any loose black beauty. I use compressed air while tapping on the tray.

I've heard oven cleaner is good to remove the burned on stuff on the dipper tray.
 
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