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3-46 DISASSEMBLY, REASSEMBLY, INSPECTION, AND MAINTENANCE
Lubrication System
Lubrication Method
For FE120, 170, 250
As shown in the diagram on the right, the revolution of the crankshaft
causes the splash arm that is provided at the big end of the connecting
rod to pick up the engine oil from the crankshaft chamber and splash it
in a spray form to lubricate the internal parts. (Forced splashing type)
For FE290, 350, 400
A forced pumping lubrication method through the use of an oil pump
has been adopted. (Forced pumping type) The oil pump draws in the
oil and pumps the oil through the oil passages described below.
The oil pump is provided with a relief valve at its outlet side. When
the oil pressure is higher than the preset pressure of the relief valve,
the relief valve opens to discharge the oil into the crankcase. When the
oil pressure is lower than the preset pressure, the relief valve closes.
If the oil pressure becomes excessively high, it could break the seal in
the oil passage, critically damaging the engine.
For the oil passage on the FE350 and 400, refer to the following
section: Valve System - HLA.