Electronics International US-8A - Manual (Page 23)

Installation Instructions
3. EGT Probe Installation:
A single EGT probe should be installed in the exhaust stack of the leanest cylinder. Each engine has its own
characteristics and the leanest cylinder can be different from aircraft to aircraft. As a general rule, the leanest
cylinder is one of the back cylinders on a carbureted engine and one of the center cylinders on a fuel-injected
engine.
Look at each exhaust stack and determine the best location at which all of the EGT probes can be mounted at
the same distance down from the exhaust ports. The ideal location is 1 1/2", but ease of installation should
prevail. Drill a 13/64" diameter hole in each exhaust stack. Insert the probe and tighten the hose clamp. As
the hose clamp is heated and cooled, it will become loose as it conforms to the exhaust stack. After the first
10 hours of operation, each hose clamp should be retightened.
IMPORTANT NOTE: For Cessna 210’s or any aircraft using a slip joint in the exhaust system, install the
EGT probes ABOVE OR BELOW THE SLIP JOINT. Installing a EGT probe in the slip joint can damage
the probe.
4. TIT Probe Installation:
If you currently have a TIT gauge mounted in the aircraft it may be a primary engine instrument. If this is
the case you will need to install a secondary TIT probe. The TIT probe should be installed on the inlet of the
Turbo-charger one to two inches before the Turbo-charger flange. Drill a 13/64" diameter hole in the ex-
haust stack. Insert the probe and tighten the hose clamp. As the hose clamp is heated and cooled, it will
become loose as it conforms to the exhaust stack. After the first 10 hours of operation, each hose clamp
should be retightened.
5. OIL Temperature Probe Installation:
Sometimes finding a location for a secondary oil temperature probe can be a problem. The P-120, P-100 and
P-128 are all sealed probes appropriate for measuring oil temperature. See the "Probes" section of the price
sheet for dimension information.
LYCOMING
IO 320, IO 360 and IO 540
Remove the 5/8" - 18 plug located on the rear engine accessory case above and forward of the oil filter
adaptor or oil screen as applicable. Install E.I.’s P-120 Oil Probe with a new oil seal and torque to
Lycoming’s specifications. Check for oil leaks after the first flight.
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3. EGT Probe Installation