15 - Engine
12 - Crankshaft
00 - General
15 - 56 9813/9750-1 15 - 56
Dimensional Check
1. Make sure that you clean the crankshaft
thoroughly with a suitable detergent.
2. Use a pipe cleaner into the lubrication ducts to
remove any residual dirt.
3. Use a compressed air jet to thoroughly clean the
oil passages.
4. Check the surfaces of the main journals and
crank-pins for wear limit, to see whether grinding
is necessary.
5. Install the half-bearings on the semi-crankcases,
without crankshaft, and couple the semi-
crankcases by tightening the fixing screws.
6. Measure the diameter of the crank-pins and main
journals with a micrometer.
7. Measure the internal diameter of the connecting
rod and crankshaft half-bearings with a dial
gauge.
8. Lubricate the contact surfaces with oil to prevent
oxidation.
9. The crankshaft and connecting rod half-bearings
must necessarily be replaced every time they are
disassembled.
10. Make sure that the measurements are within the
allowable limits.
Figure 143.
A Crank-pin B Main journal
C Connecting rod half-bearing D Crankshaft half-bearing
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