How do you tell a 534 from a 477 without pulling them down? Bought several nice running 3-axle U850 ,40,000 gvw. The engines have been R&R'd in each one several times. After steam cleaning, I didn't find any ID such as distributor tags. Thanks for your help!
The 534 stroke was 4.20, the 477 was 3.75. Pull a spark plug, and stick in a very long bladed screwdiver. Carefully rotate the engine, marking top center & bottom center on the screwdriver shaft. Might not be precise, but close enough to tell if it is a 534.