300 V6-3.5L (2008)
Crankshaft Main Bearing: Procedures
CRANKSHAFT MAIN BEARING FITTING
The main bearings are a "select fit" to achieve proper oil clearances. For main bearing selection, the block and crankshaft have grade identification
marks.
The marks for the cylinder block main bore grade are located on the right front side of the engine block. These grade marks (1, 2, or 3) are read left to
right, corresponding to main bore 1, 2, 3, 4. The 5th digit is a check some digit for plant validation during manufacturing.
The grade marks for the crankshaft are located on the rearmost crankshaft counter weight as shown in. The crankshaft journal grade marks (A, B, or C)
are read left to right, corresponding with journal number 1, 2, 3, 4.
Refer to the MAIN BEARING SELECTION CHART to properly select the main bearings. For an example, if the main bore grade is 3 and the journal
grade is B, the proper select fit bearing would be a (2) +0.003 mm (+0.0002 in.).
