What should be concluded if rod bearing inserts protrude slightly above the margin of the bearing cap?

If rod bearing inserts are observed to protrude slightly above the margin of the bearing cap, it can indeed be considered a normal condition. When bearings are installed, a slight amount of protrusion might be expected, especially in the context of engine assembly tolerances. This condition could be related to the design of the engine and the specific characteristics of the bearing itself. Manufacturers may design certain bearings to sit higher to accommodate for oil clearance, thermal expansion, or to ensure proper lubrication.

In professional practice, it is crucial to be aware that while some slight protrusion can be acceptable, significant protrusion or variations beyond what is specified by the manufacturer may warrant further investigation. Proper guidelines and specifications provided by the engine manufacturer should always be consulted for specifics about acceptable bearing insert tolerances.