Crankshaft Main Bearing: Specifications

ENGINE SPECIFICATIONS






MAIN BEARING CAP TORQUE AND SEQUENCE





1. Follow the torque sequence shown for the crankshaft main bearing journal cap bolts.
2. Main bearing journal caps must be tightened in two stages.
- Stage one for m8 bolts, 20 Nm (15 ft. lbs.).
- Stage two for m8 bolts, rotate 90° clockwise.
- Stage one for m10 bolts, 30 Nm (22 ft. lbs.).
- Stage two for m10 bolts, rotate 90° clockwise.

3. Turn the crankshaft to check for unobstructed movement.

MAIN BEARING SIZE CODE CHARTS





NOTE: Before the Crankshaft can be installed, the proper thickness upper and lower main bearings along with the proper thickness thrust plate have to be selected. Below are tables followed by directions to help you determine the appropriate thickness upper and lower main bearing shell halves and thrush plate.

UPPER BEARING SHELL SELECTION









The top bearing shell halves are assigned to the specific journal of the crankshaft by means of a colored ring on the rear of the upper bearing shell half and numbers or center punch marks, which are stamped into the crankcase near the bearing cap. Only the assigned color and numerical combinations may be fitted together. EXAMPLE: You see the number 2 or two punch marks stamped into the cylinder block, you need to use the Yellow bearing shell half for the upper bearing shell.

LOWER BEARING SHELL SELECTION









The bottom halves of the bearing shells are assigned to the specific journal of the crankshaft by means of a letter engraved on the journal of the crankshaft. Each letter represents a color of the necessary bearing shell. EXAMPLE: If the first letter engraved on the crankshaft is a "r", than the first lower main bearing shell half is the Red main bearing shell half.