Cummins 4BT – Connecting Rod Bearing – Replacement – Cleaning and Inspection

Wash the bearing and connecting rod caps. Dry with compressed air.

Visually inspect the connecting rod caps, connecting rod bearing saddles, and capscrews for nicks, cracks, burrs,
scratches, or fretting.

Visually inspect the bearings for damage.
Replace any bearings with the following damage:
Pitting
Flaking
Corrosion
Lock tang damage
Scratches

Visually inspect the bearing shell seating surface for nicks or burrs.
If nicks or burrs cannot be removed with Scotch-Brite® 7448 or equivalent, the bearings must be replaced.

Use an outside diameter ball tipped micrometer to mea­sure the connecting rod bearing thickness.