Yanmar 4LHA-HTP - Oil Pressure Control Valve

Chapter 5 Lubrication System
4. Oil Pressure Control Valve
4LHA Series
4. Oil Pressure Control Valve
4-1 Oil pressure control valve construction
The oil pressure control valve built into the oil cooler housing
controls the oil pressure when the lube oil passes through the
oil cooler housing. When the pressure of lube oil exceeds the
setting, the control valve piston opens the bypass hole and
lube oil flows back into the oil pan.
Cylinder block
Pressure control valve
Spring
Packing
Regulating pressure
0.34 - 0.44(3.5-4.5)
MPa(kgf/cm)
at 3,400 rpm
4-2 Oil pressure control valve replacement
The control valve has been adjusted and assembled at the
factory, so it should not be disassembled without good
reason.
5-8