Polaris 2005 Sportsman MV7, Service Manual

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ENGINE
3.18
OIL FLOW
This chart describes the flow of oil through the EH68 and the EH059 engine. Beginning in the crankcase sump,
the oil is drawn through an oil galley to the feed side of the oil pump. The oil is then pumped through the oil filter.
If the oil filter is obstructed, a bypass valve contained in the filter allows oil to bypass the filter element. At this
point, the oil is supplied to the main oil galley through a crankcase passage. Oil is then diverted three ways from
the main oil galley, with the first path entering the camshaft bores, onto the rear balance shaft journal and then
draining back into the crankcase sump. The second oil path from the main oil galley feeds the lifter bores and
then drains back to the crankcase sump. The third oil path flows through a crankcase galley to the MAG side
crankshaft journal and also to the front balance shaft journal and onto the crankcase sump. The oil pressure
switch is fed off the main oil galley.
Main Oil Gallery
Counterbalance
Bore
Lifter Bores
Camshaft
Bore
Camshaft
Bore
Camshaft
Bore
Crankshaft
Rod
Bearings
Counterbalance
Bore
Oil Pressure
Relief
Crankshaft
Main Bearing
Crankcase
Sump
Sump
Crankcase
Pump
Filter
MAGNETO
SIDE
PTO
SIDE
Main Bearing