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Overhauling the crankcase halves
Visually inspect the engine crankcase halves.
Check that the surfaces of the crankcase halves are perfectly flat using a reference surface.
Check bearing (9) and (10) conditions.
If they need to be replaced, it is necessary to replace them in pairs.
Warning
When overhauling an engine it is good practice to replace all the crankcase bearings.
Replace the bearings (11) and (12) on the ends of the gearbox secondary shaft and timing layshaft
bearings (15) and (16).
When replacing bearings (13) and (14) supporting the gearbox primary shaft, block them on the crankcase
half with spacers (17) and stop plate (18) respectively fixed by screws (19) and (20).
Upon each overhaul it is recommended to replace also the seal ring located between bearing (14) and
chain-side crankcase half: lubricate the ring with denatured alcohol, introduce it fully home in the crankcase
half as shown in the figure.
At each overhaul it is recommended to replace also the sealing ring (22) and the seal ring (23).
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