D4400 Main Bearing Erosion??

Hey Iron River isn't too far away. I e-mailed this guy. He told me $200 for rods and mains. http://www.wkarrinc.com/

That's an absolutely classic picture of babbitt bearing erosion caused by acids formed in the engine from combustion by-products .. or too high detergency oil. I have never seen an example so bad.

Cat changed over to aluminum bearings sometime in the 40's .. but I can't find the info again on just when .. even though I came across it recently.
I can't see any reason why you couldn't replace the babbitt bearings with aluminum type. The aluminum type bearing was regarded as a major upgrade to the engines, with vastly improved bearing life.

Hi Team,
the SM is Nov. 29 1946. I do not have an actual copy but a Reprint Edited version from the "Selected Service Magazine Articles-- 1932-1950" booklet Form No 3094. Page 53.
Cheers,
Eddie B.

Thanks for the replies. Tomorrow I'm going to check with the place that jmvmopar suggested. If anyone has ever modified these shells to accept bearing inserts from another engine such as the D320 that has the same size crank journals as the D4400, I would like to hear about it. Thanks again, Dean

I did call cat on rod bearings they said $100 per journal. I didn't even ask for main bearing prices after that.