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%  Section 31-10. Sensors/probes and transducers send electrical signals to a data processing unit (DPU). The DPU sends the data to the VM 1000 to give a display. The VM 1000 display has these indications: ) RPM. ) Oil temperature. ) Fuel flow. ) Cylinder head temperature (CHT) for all four cylinders. ) Exhaust gas temperature (EGT) for all four exhaust down-pipes. ) Oil Pressure. ) Fuel Pressure. ) Manifold pressure. ) Main bus voltage. ) Alternator output amperage. % You cannot repair the integrated engine instrument.
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% % % % % % % % % % % % % % % % % % % % % % % % Figure 1: VM 1000 Integrated Engine Instrument
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Engine Indicating
AMM

B. Transducers and Sensors
The engine indicating system uses these transducers/sensors:
%) RPM sensor. The RPM sensor is mounted to the right magneto. You can replace the RPM % sensor.
) Oil temperature sensor. The oil temperature sensor attaches to a special mounting on the rear accessory housing. You can replace the oil temperature sensor.
) Fuel flow sensor. The fuel flow sensor is located in the fuel supply hose to the fuel injector. You can replace the fuel flow sensor.
) Cylinder head temperature (CHT) sensor. The engine has a CHT probe attached to the bottom of each cylinder head. You can replace the CHT probe.

) Exhaust gas temperature (EGT) sensor. The engine has an EGT probe attached to the exhaust down-pipe from each cylinder head. You can replace the EGT probe.
) Oil pressure transducer. A P-clamp attaches the oil pressure transducer to the engine-mounting-frame on the right-top side. A flexible hose connects the transducer to a connection in the engine oil system near the oil-pressure-relief-valve. You can replace the oil pressure transducer.
) Fuel pressure transducer. The fuel pressure transducer is in the fuel supply hose to the fuel injector. You can replace the fuel pressure transducer.
) Manifold pressure transducer. A P-clamp attaches the manifold pressure transducer to the % engine-mounting-frame, on the top-left side. A flexible hose connects cylinder no. 4 to the % manifold pressure transducer. When the LASAR control unit is installed, then a Tee-piece is % installed in the flexible hose. Another flexible hose connects the Tee-piece to the LASAR % control unit. You can replace the manifold pressure transducer.
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Figure 2: Replace the Oil Temperature Sensor
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Engine Indicating
AMM AIRCRAFT
LYCOMING  LYCOMING 
Fuel Flow 
Connector 
Fuel Flow Sensor 
Engine Sump 
Electrical 
Connector 
Fuel Feed Hose  Fuel Feed Hose 
to Injector  from Fuel Pump 
45 Fitting  45 Fitting 
Fuel Flow Sensor 
Figure 3:  Fuel Flow Sensor Installation 

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AIRCRAFT AMM
LYCOMING LYCOMING
CHT Spade Connectors
CHT Spade 
Connectors 
Cylinder Head 
CHT Probe 
VIEW UNDER LEFT REAR CYLINDER HEAD 
SHOWN, OTHERS SIMILAR 
Figure 4: CHT Probe Installation 
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Engine Indicating
AMM AIRCRAFT
LYCOMING
LYCOMING
EGT Spade 
Connectors 
EGT Spade 
Connectors 

EGT Probe
Worm-Drive Clamp
LEFT SIDE SHOWN RIGHT SIDE SIMILAR
Figure 5:  EGT Probe Installation
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Flexible Hose 
P-Clamp 
Adaptor  Engine Mount Tube 
Oil Pressure Sensor 
　
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