oc-3 engine number

[tcr]

I finally dug thru all the grease and dirt and found a tag on the right side of the engine(ixb-3). the engine # is 2473369, and is also stamped on the left top of the block.  Does  tell me any info about the crawler, or is it only the engine #, and what does it tell me.
Also the paint is red on most of the engine, I thought everything was yellow.  could this of been a replacement motor?
Any info appreaciated.
thank you
tcr