F2B ENGINE 59 T RAKKER E URO 4/5 PRELIMINARY MEASUREMENT OF MAIN AND BIG END BEARING SHELL SELECTION DATA For each of the journals of the crankshaft, it is necessary to carry out the following operations: MAIN JOURNALS: - Determine the class of diameter of the seat in the CRANKPINS: - Determine the class of diameter of the seat in the crankcase. connecting rod. - Determine the class of diameter of the main journal. - Determine the class of diameter of the crankpin. - Select the class of the bearing shells to mount. - Select the class of the bearing shells to mount.
DEFINING THE CLASS OF DIAMETER OF THE SEATS FOR BEARING SHELLS ON THE CRANKCASE On the front of the crankcase, two sets of numbers are marked in the position shown (Figure 72 at top). - The first set of digits (four) is the coupling number of the crankcase with its base. - The following seven digits, taken singly, are the class of diameter of each of the seats referred to (Figure 72 at bottom). - Each of these digits may be 1 , 2 or 3 . CLASS MAIN BEARING HOUSING NOMINAL DIAMETER Figure 72 89.000 to 89.009 89.010 to 89.019 89.020 to 89.030 47535 Print 603.93.641 Base q November 2006