Q: What defects should be inspected in connecting rod bearings to identify specific issues on Lincoln Aviator?
A: Check connecting rod bearings: cratering is a sign of fatigue failure, spot polishing is an indication of improper seating, embedded dirt is a sign of contaminated oil, scratching is a sign of dirty oil, and exposed bottom is a sign of poor lubrication. Scratched edges could be a sign of a damaged journal, or incorrect seating of the bearings.