Removing the sprocket and timing chain
1. Remove the pistons or alternatively disconnect the main bearings if you do not need to perform any operations on the pistons and cylinders. Also remove the camshaft gears (shafts), front crankshaft oil seal and flywheel (driving disc).
2. Turn out bolts of an intermediate disk from a back part of the block of cylinders.
3. Release the chain from the front sprocket of the crankshaft and remove the sprocket by prying it with a lever. Remove the chain.
4. If necessary, remove the camshaft bracket bolts from the front of the cylinder block and remove the safety (reduction) lubrication valve. Also, if necessary, remove the lower chain guide.
5. Check up presence of labels on covers of radical bearings and, if it is necessary, make new labels.
6. Before removal of a cranked shaft be convinced that its axial backlash is in the established limits. For this purpose, insert the feeler plate between the web of the crankshaft and the thrust surface of the 2nd bearing shell
7. Turn away bolts and, easily tapping on covers of radical bearings, remove them together with loose leaves of bearings.
8. Pull up the crankshaft from the crankcase.
9. Remove the bearing shells from the covers and crankcase, marking them with relative positions. Also take out (lever) upper half of the crankshaft rear oil seal from the crankcase.