Overhaul Of The Crankcase Halves; Overhauling The Main Bearings - Ducati Monster 796 Workshop Manual

Crankcase assembly: crankcase halves
Remove gearbox shafts and gear selector drum from the crankcase halves (Sect. 9 - 7.2, Removal of the gearbox
assembly).
Drive out the crankshaft (C) using a plastic mallet, taking care not to lose the shims (D).
Remove the timing belt driveshaft (2).
Remove the O-ring (5) on the oilway connecting the two crankcase halves.

Overhaul of the crankcase halves

Carefully examine the engine crankcase halves.
Check that the surfaces of the crankcases are perfectly flat using a reference surface. Check that the bearings (4) and
(23) are in good condition. Note that the main bearings must always be changed in pairs (refer to the procedure below in
"Overhauling the main bearings").
Note
When overhauling an engine it is good practice to renew all the crankcase half bearings.
Renew the bearings (10) and (15) on the ends of the gearbox secondary shaft and timing belt driveshaft bearings (7) and
(21).
When renewing the primary shaft bearings (14) and (12), install them to the crankcase half using spacers (17) and stop
plate (9) and fasten with screws (18) and (8) respectively.
At each overhaul it is recommended to renew also the sealing ring (13) in-between bearing (12) and chain-side crankcase
half: lubricate the ring (13) with denatured alcohol, drive it fully home against the crankcase half, and orient it as shown.