Overpressure Safety Valve; Lubricating Oil Pressure Regulating Valve; Thermostatted Oil Valve - Kohler SFGLD480 Operation & Maintenance Manual

2.3. OVERPRESSURE SAFETY VALVE

The overpressure safety valve or relief valve lies at the outlet of the oil pump. Its function is to control pressure
and discharge oil directly to the sump if the impulse pressure exceeds the rated pressure (8 bar / 116 psi), thus
protecting engine components from failure. The valve is fixed to a bracket attached to the ribs of the oil sump.
(See Fig. 1).

2.4. LUBRICATING OIL PRESSURE REGULATING VALVE

Its function is to regulate the lubricating oil pressure of the engine. It is located at the inlet to the oil filters and is
rated at 4.5 bar (65 psi). Its function is to discharge the surplus oil when the rated pressure is exceeded, ensuring
that the oil pressure is constant under all the engine operating or load conditions.

2.5. THERMOSTATTED OIL VALVE

Its function is to control the minimum oil temperature. It is located at the inlet to the oil cooler. It operates in such a
way that when the oil temperature drops below a preset value (75ºC), it prevents oil from going through the
cooler, allowing oil to heat up quickly. Once the minimum oil temperature has been reached, all the oil will flow
through the cooler.
2.6. OIL COOLER
These engines have an external oil cooler, which in its standard version, is the pipes type, housed in a casing.
The design of the oil cooler can be adapted to the application requirements.
2.7. CLOGGED FILTER VALVE
Situated upstream of the filters, this valve would divert oil to the sump in order to avoid damage to filter cartidges,
should pressure exceed the set limit of 6 bar due to the clogging of the filters.
2.8. SAFETY OIL PRESSURE SWITCH
All V-engines have a low oil pressure switch in the main lubrication gallery. If the lubrication pressure is
insufficient, the alarm will go off as a warning about the need for service or activate the engine shutdown.
When oil flows back into the sump due to the clogging of the filters, it is normal that pressure drops after the filters
and this pressure switch activates the alarm.
It is possible to have a high oil pressure switch. This will be placed at the inlet to the oil filters. It will operate,
activating an alarm, when the oil pressure rises due to the clogging of the filters or if the oil flow is blocked.
2.9. OIL FILTERS
The filters are of the interchangeable and full flow cartridge type, oil being entirely cleaned in a set of three
parallel filters. They have no bypass or non-return valve. Filtering efficiency is 99% at 30m and >50% at 15m.
2.10. JET PRESSURE REGULATION VALVE
On a V-engine, this valve lies at the end of the main lubrication gallery (side opposite the oil inlet to the engine
block). It is rated at 3 bar (43.5 psi) and its function is to allow oil to pass to the jet gallery and to the piston
coolant jets themselves when the rated pressure is reached.
PRODUCT INFORMATION
IC-C-D-25-005e
DESCRIPTION OF LUBRICATION SYSTEM
2.3.2
INDEX
C
February 2012
FOR "V" ENGINES
DATE
Dep. 2
O&M_2.002211.810_A_10_2016
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