Removal
Disassemble the engine (see section above "Disassembling and assembling the engine").
Remove the camshaft.
Remove the crankshaft, bearings and remove the 1st bearing from the flywheel side. Be careful not to let the bearings fall out when removing the crankshaft. Mark them.
Disassembly
Secure the crankshaft to the supports.
Remove the V-belt pulley key and remove the 4th bearing together with the oil deflector disc.
Using special pliers, remove the distributor drive gear retaining ring.
Press the ignition distributor drive gear, installation ring and timing gear from the crankshaft. Remove the keys.
Remove the 3rd bearing.
Remove the connecting rods.
Clean the crankshaft and blow out the oil passages with compressed air. Lubricate all main and connecting rod journals with oil to prevent corrosion.
Check the crankshaft for cracks and regrind or replace it if necessary.
Check the holes of the ignition distributor drive gear and the timing gear drive gear for scoring, check the contact patch of the ring gear.
Check the tightness of the mounting pins.
Assembly
Wash the crankshaft with gasoline, blow out the oil channels with compressed air.
Lubricate the 3rd bearing with oil and place it on the shaft.
Install keys for both drive gears.
Heat both drive gears in an oil bath to approximately 80°C.
Press the heated timing gear onto the shaft with the chamfer facing the 3rd bearing.
A bushing and guide wedge are used to install the timing gear and the distributor drive gear. The latter serves to ensure that the groove in the drive gear is correctly directed in relation to the key during installation.
Put on the mounting ring.
Press on (also using a bushing and a guide wedge) heated ignition distributor drive gear and after cooling, check the strength of its fit.
Install the retaining ring. To do this, close the 4th journal of the shaft with a tapered guide sleeve so as not to damage its supporting surface.
Lubricate and install the 4th bearing. The annular groove in it should be directed towards the oil deflector disc.
Install the V-belt pulley key.
Install the connecting rods.
Installation
Caution! Oil outlet holes in the shaft journals and bearings must not have sharp edges.
If there are foreign metal inclusions on the working surface of the bearings, they must be carefully removed with a file, without damaging the bearing.
Attention! New bearings do not need to be processed.
Check the tightness of the mounting pins in the bearing holes.
Install the 2nd bearing into the hole.
Lubricate the 1st bearing with oil and install it on the shaft so that its holes for the mounting pins are directed towards the flywheel.
Install the crankshaft, making sure that all dowel pins are correctly inserted into the bearing bores.
When installing the crankshaft, it is necessary to take into account the marks of its mounting position in relation to the camshaft.
Assemble the crankcase.
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