Electronics International US-8A - Manual (Page 24)

Installation Instructions
All Other Engines
Equipped with a 5/8"-18 Oil Drain Plug
Remove the 5/8" - 18 oil drain plug located on the bottom of the engine. Install E.I.’s P-120 Oil Probe with a
new oil seal and torque to specifications. Check for oil leaks after the first flight.
6. Carb Temp Probe Installation:
Remove the threaded plug located in the carburetor housing just below the throttle valve. Install the Carbure-
tor Temperature Probe in this hole using a lock washer. Care should be taken not to over-tighten the probe
and strip the threads in the carburetor housing.
NOTE: A Carb Temp Probe should be connected to a precision channel on the Ultimate Analyzer. That
would be channel 5 or 6 on a US-8A-4 or channel 7 or 8 on a US-8A-6. A three to four degree F error can
occur in some instances if the Carburetor Probe is not connected to a precision channel.
7. OAT Probe Installation:
Mount the OAT Probe in an appropriate location on the aircraft, using the hardware supplied. The OAT
Probe is sensitive to air temperature changes. For this reason, do not mount the OAT probe in the path of the
cowl or engine exiting air (i.e., on the belly of the aircraft). Other than this consideration the OAT Probe
may be mounted in an air intake vent, on the side of the cowling or anywhere else on the aircraft.
NOTE: An OAT probe should be connected to a precision channel on the Ultimate Analyzer. That would be
channel 5 or 6 on a US-8A-4 or channel 7 or 8 on a US-8A-6. A three to four degree F error can occur in
some instances if the OAT Probe is not connected to a precision channel.
8. Add any Aditional Cables and Mark each Cable :
In the installation kit there are two identical pre-wired Extension Cable Harnesses. One end has a Circular
Connector and the other end has red Slip-on Connectors on the individual extension cables (see the Wiring
Diagram at the back of this manual). The harnesses have been wire for only the EGT and CHT channels.
One of these harnesses is to be used for the 8 channels on the right display and the other is to be used for the
8 channels on the left display. The harnesses are identical and may be used for either display. The ends of
each of the extension cables in the harness has a piece of yellow heat shrink marked with its channel number.
Mark the Circular Connector that will be connected to the right and left display.
Any channel used to measure a temperature other than EGT or CHT (TIT, OAT, Carb Temp, etc.) will have
a type K thermocouple extension cable lose in the kit. Plug any additional extension cables into the appropri-
ate pins of the Circular Connector (see "Appendix A" at the back of this manual).
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5. Oil Temperature Probe Installation