Cummins ISX11.9 CM2250 – Service Manual 001-005   Bearings, Connecting Rod

Rotate the crankshaft so that two of the connecting rods are at bottom dead center.

CAUTION  Do not damage the fractured split surface on the connecting rod or connecting rod cap while the connecting rod caps are removed. If the fractured split surface is damaged, the connecting rod and connecting rod cap must be replaced to reduce the possibility of engine damage. Incorrect assembly can damage the rod.

CAUTION  Make sure the piston cooling nozzles have been removed before removing the connecting rod cap. Damage to the nozzles can occur if they are not removed.

Do not remove the capscrews at this time.

Loosen the connecting rod capscrews.

Hit the connecting rod capscrews with a rubber hammer to loosen the rod caps.

Remove the capscrews and the rod cap. Note the corresponding rod and rod cap as well as the orientation of the rod cap.

Be careful not to damage the fractured split connection.

DO NOT set the rod cap down on its fractured split face.

NOTE: Both the rod cap and the connecting rod are serialized on one face to make sure of proper orientation.

NOTE: Minimize the number of joint interactions between the connecting rod and rod cap. There is only a finite number of times a connecting rod and rod cap can be assembled and removed before the joint loses its proper interaction.

Remove the bearing shell from the rod cap and mark the cylinder number and the letter “L” on the flat surface of the bearing tangs.

Install two of the capscrews back into the rod finger tight.

Use a T-handle piston pusher to push the rod up far enough to allow the upper bearing shell to be removed.

Do NOT push against the fractured split face of the rod.

Use caution to avoid scratching or other damage to the journal with the rod, capscrew or piston pusher

Remove the bearing shell and mark the cylinder number and the letter “U” on the flat surface of the bearing tangs.