Lubrication system for engines mod. 406 and 402 combined: pressurized and sprayed
The lubrication system consists of the engine oil sump, oil pump, full flow filter, oil cooler, hoses and oil passages in the engine block.
Pressure in the lubrication system is generated by a gear oil pump.
The oil pump takes oil from the engine crankcase and supplies it to the full-flow oil filter, then the oil passes through the channels to the main and from them to the connecting rod bearings.
Oil flows through a channel in the connecting rod to the piston pin.
Part of the oil enters the head of the block through a vertical channel, where it lubricates the valve drive parts, and from there flows into the crankcase.
Part of the oil from the oil pump passes through the oil cooler valve and enters the oil cooler, where it cools down and enters the crankcase again.
In the engine mod. 406 oil also passes through hydraulic chain tensioners and valve lifters.