163
OILING SYSTEM
COMPONENTS
8
2-CYLINDER MODELS
Oil Recirculation System
External ho ses an d f ittings, internal cylin-
der/crankcase passages, and intake manifold pas-
sages are used to recirculate any accumulation of
oil from various loca tions in the powerhead. The
movement of oil is controlled by check valves.
Cylinder Recirculation
Internal p owerhead oil drain p assages connect
the intake port areas of the cylin ders to circulate
residual oil in the block.
External fittings and in-l ine check valves on each
side of the cylinder block control the movement of
oil from the lower cylinder port to the upper cylin-
der port.
Crankcase / Main Bearing Recirculation
The movement of oil through the main bearings is
controlled by int ernal p assages, e xternal fittings
and hoses, and check valves.
Lower to upper main bearing oil flow:
• Lower main bearing cavity to internal crankcase
passage to external fitting, external h oses with
in-line ch eck valve to external fitting a t upp er
main bearing, a nd into upper ma in bearing
through internal crankcase passage.
• Internal crankcase passage to external fitting in
crankcase cove r at u pper main bearing, hose
routed to reed plate fitting. This circuit vents the
upper main bearing cavity to promote oil flow.
Refer to the OIL RECIRCULATION DIAGRAMS
on p. 158.
1. Crankcase oil fittings 006614
1. Cylinder block oil fittings 006615
1. Upper main bearing vent 002399
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