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engine oil supply is contained in the engine sump. The engine oil pump supplies oil to the oil cooler
adaptor (supplied by the airplane manufacturer).
The oil cooler adaptor holds the oil filter. The oil filter is a full-flow canister. The oil flows through
the oil filter to a thermostatic relief-valve (Vernatherm). It also flows to the outlet of the oil cooler.
The vernatherm makes a by-pass between the outlet from the oil filter and the inlet to the engine
system. The vernatherm has two functions:
− It senses oil temperature. At less than 110°F (43°C) the valve is open and the oil flows
through the valve directly to the engine. Between 110°F and 170°F (43°C and 77°C) the
valve gradually closes. The hot oil must flow through the oil cooler
− It senses the differential oil pressure across the oil cooler. If the oil cooler becomes blocked,
the valve opens to allow oil to by-pass the cooler.
The oil cooler attaches to two brackets on the front face of the firewall. A GFRP plenum chamber
above the oil cooler connects to a large flexible air hose. The hose supplies cold air from the
cooling pressure chamber above the engine. Rubber hoses connect the oil cooler to the oil cooler
adaptor on the engine.
As the hot oil flows through the oil cooler matrix, ram air from above the engine flows into the air
hose at the aft baffle. The air then flows down the hose and over the oil cooler matrix to cool the oil.
Oil Systems
DA20-C1 AMM
Page 2
19 Dec 1997 79-00-00 Doc # DA 201-C1
Rev. 0
Figure 1: Oil Distribution and Cooling System Schematic Diagram
DA20-C1 AMM
Oil Systems
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29 Apr 2004
There are no adjustments to the oil distribution and cooling system. See the Teledyne Continental
Motors IO-240-B Maintenance Manual for adjustment of the engine oil pressure relief-valve.
The engine has an oil breather system. A hose connected to an external connector on the
crankcase lets the oil/air mixture flow from the crankcase to the oil/air separator that attaches to the
outside of the engine. The oil flows from the oil/air separator back to the sump through a hose.
And the air gets ejected through the separator vent pipe out through the bottom of the engine
cowling.
Figure 2 shows the location of the oil indication components. The oil temperature-sensor is
installed at the top of the engine oil cooler adaptor. An electrical cable connects the sensor to the
oil temperature indicator. The oil temperature indicator is positioned at the right of the instrument
panel adjacent to the oil pressure indicator. The thermistor (temperature sensitive resistor) in the
oil temperature-sensor changes its resistance with temperature. The oil temperature indicator uses
the resistance to measure the oil temperature.
The oil pressure sensor is installed at the top of the engine oil cooler adaptor. An electrical cable
connects the sensor to the oil pressure indicator. The oil pressure indicator is positioned at the
right of the instrument panel adjacent to the oil pressure indicator. The oil pressure sensor has a
resistance in proportion to the oil pressure. The oil pressure indicator uses the resistance to
measure the oil pressure.
OIL PRESSURE
Indication Sender Resistance in Ohms
10 PSI 19 +/- 5
30 PSI 60 +/- 5
60PSI 117 +/- 5
100 PSI 182 +/- 7
A pressure switch installed at the top of the oil cooler adaptor operates the engine operated hours
meter.. An electrical cable connects the pressure switch to the engine operated hours meter..
When the engine oil pressure increases to 0.4-0.55 bar (6-8 psi) the pressure switch contacts
close. And when the engine oil pressure decreases below 0.4-0.55 bar (6-8 psi) the pressure
switch contacts open. The pressure switch thus controls the operation of the engine operated
hours meter.
Oil Systems
DA20-C1 AMM
Page 4
19 Dec 1997 79-00-00 Doc # DA 201-C1
Rev. 0
Figure 2: Oil Indication Component Locations
DA20-C1 AMM
Oil Systems
Doc # DA 201-C1
Rev. 0 79-00-00 Page 5
19 Dec 1997
Figure 3: Oil Cooler Component Locations
Oil Systems
DA20-C1 AMM
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19 Dec 1997 79-00-00 Doc # DA 201-C1
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Oil Systems
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19 Dec 1997
TROUBLE-SHOOTING
1. General
The table below lists the defects you could have with the oil system external to the engine. See the
Teledyne Continental Motors IO-240-B Maintenance Manual for trouble-shooting the engine oil
system. If you have the trouble detailed in the Trouble column read across to the Possible Cause
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