A Series Diesel Engine Lubricating System Flow 117
Oil Filter
A plugged filter will cause a gradual loss of pressure
by approximately 69 kPa [10 PSI]. The pressure will
return to normal when the filter bypass valve opens.
Oil Gauge
Check the oil gauge and sending unit to make sure
they are operating correctly by verifying the pressure
with a manual gauge.
Oil Suction Tube
A loose suction tube, damaged gasket or crack in the
suction tube can cause a temporary loss of prime for
oil pump. The engine will have low pressure or no oil
pressure at starting followed by normal oil pressure.
Bearings and Oil Pump
A steady decrease in oil pressure over a long period of
time can be an indication of worn bearings or
excessive oil pump wear.
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