Repair manual

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
crankcase.
- Determine the class of diameter of th e main journal.
- Select the class of the bearing shells to mount.
CRANKPINS:
- Determine the class of diameter of the seat in the
connecting rod.
- Determine the class of diameter of the crankpin.
- 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 fron t of t he crankcase, two set s of n umbers are marked in the position shown (Figure 24 at top).
- The first set of digits (four) is the coupling number of the crankc ase with its base.
- The following seven digits, taken singly, are the class of diameter of each of th e seats referred to (Figure 24 at bottom).
- Each of these digits may be 1, 2 or 3.
47535
106.300 to 106.309
106.310 to 106.319
106.320 to 106.330
Figure 24
CLASS
MAIN BEARING HOUSING
NOMINAL DIAMETER
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
17
F3C CURSOR ENGINES
Print P2D32C005 E Base - May 2007