F2B ENGINE 61 T RAKKER E URO 4/5 DEFINING THE CLASS OF DIAMETER OF THE MAIN JOURNALS AND CRANKPINS (Journals with nominal diameter) Main journals and crankpins: determining the class of diameter of the journals. Three sets of numbers are marked on t he crankshaft in the position shown by the arrow (Figure 74 at top): - The first number, of five digits, is the part number of the shaft. - Under this number, on the left, a set of six digits refers to the crankpins and is preceded by a single digit showing the status of the journals (1 = STD, 2 = -0.127), the other six digits, taken singly, give the class of diameter of each of the crankpins they refer to (Figure 74 at top).
- The set of seven digits, on the right, refers to the main journals and is preceded by a single digit: the single digit shows the status of the journals (1 = STD, 2 = -0.127), the other seven digits, taken singly, give the class of diameter of each of the main journals they refer to (Figure 74 at bottom). Figure 74 CLASS CRANKPIN NOMINAL DIAMETER 72.915 to 72.924 72.925 to 72.934 72.935 to 72.945 CLASS MAIN JOURNALS NOMINAL DIAMETER 82.910 to 82.919 82.920 to 82.929 82.930 to 82.940 Print 603.93.641 Base q November 2006