B3.9 and B5.9 Series Engines
Section 1 - Cylinder Block - Group 01
Inspect the crankshaft journals for deep scratches, indi-
cations of overheating, and other damage.
NOTE: If the crankshaft journals or main caps are dam-
aged, the engine will need to be removed to complete the
Determine the size of the main bearing removed, and ob-
tain the same size for installation.
Refer to Procedure 001-016 for measurement specifica-
Refer to Base Engine Component Specifications for the
dimensions of the standard and undersize main bearing
Measure the installed main bearing bore diameter.
Main Bearing Bore Diameter (Maximum)
A damaged, worn, or missing thrust bearing flange on the
upper main bearing shell can be detected by measuring
the end play of the crankshaft.
Dimension (A) End Play Limits