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

CAUTION  The connecting rod and bearing shell mating surfaces must be clean and dry when the bearing shells are installed. Used bearings must be installed in their original location or engine damage can occur.

Use clean Lubriplate™ 105 multi-purpose lubricant, or its equivalent, to lubricate the crankshaft journal mating surface of the upper bearing shell.

Install the upper bearing shell into the connecting rod with the tang of the bearing in the slot of the rod.

Install the bearing shell into the connecting rod cap with the tang (2) of the bearing in the slot (1) of the cap.

Use clean Lubriplate™ 105 multi-purpose lubricant, or its equivalent, to lubricate the bearing shell to the crankshaft journal mating surface.

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.

NOTE: Make sure that the rod cap is installed only on the connecting rod from which it was removed and that the rod cap is properly oriented during installation.

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

Install the cap onto the connecting rod.

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.

Lubricate the threads and underside of the head of the connecting rod capscrews with clean engine oil.

Thread the capscrews into the connecting rod and hand tighten.

Tighten the capscrews in numerical sequence. Refer to Procedure 001-054 in Section 1.

Measure the connecting rod side clearance.

Connecting Rod Side Clearance

The connecting rod must move freely from side to side on the crankshaft journal. If the rod does not move freely, remove the rod cap and make sure the bearing shells are the correct size. Check for dirt or damage on the crankshaft and the bearing shells.

Repeat the above steps to install the remaining bearing shells and connecting rod caps.