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Gravity: the oil,pumped up to the valve chamber trickles down tubes to the main bearings and cam bores.The hydrodynamic principle lifts the crankshaft on a cushion of oil. Gravity volume is high enough for the low rpm engine.splash also occurs in the valve chamber..
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There is also an "oil return" tube that returns excess oil from the rear of the valve chamber to the lower front of the block, where the oil flows into the dipper tray.
Also note that the engine sits on a slope of 3° towards the rear.