Installation manual

610C-001 INSTALLATION MANUAL DOCUMENT No. 070906 REV. 1.2
INSIGHT INSTRUMENT CORP. BOX 122, FORT ERIE, ONTARIO, L2A 5M6
Probe Characteristics
The Spring Probe (2852) has a probe bushing with a screwdriver slot to facilitate tightening into place. A drop
of anti-seizing lubricant on the threads before installation will ease installation, and subsequent removal. When
installing Spring Probes be sure you have correctly identified the standard thermo-well. Some aircraft have fuel
primer ports with the same thread size.
Many factory-installed CHT displays utilize a single threaded or bayonet-style resistive type probe that oc-
cupies one of the thermo-wells. This probe is not compatible with the thermocouple probes required for the
Graphic Engine Monitor.
A Spark Plug Gasket Probe (2853) may be used on this cylinder for the GEM series Display, so as to allow the
factory-installed display to remain functional.
The Spark Plug Gasket Probe replaces the standard copper spark plug gasket on one spark plug in the select-
ed cylinder. The spark plug chosen should be the one that provides the best correlation with the other tempera-
ture probes. On common downdraft-cooled engines the selected cylinder will be the upper plug. Allow enough
wire length to move the probe to the other plug if necessary.
The Spark Plug Gasket must be removed and replaced by the Gasket Probe. Annealing of the Gasket Probe is
not required or recommended, and the Gasket Probe Does Not require replacement when the spark plugs are
changed.
Alternatively, an Adapter Probe may be used instead of a Gasket Probe. An adapter probe will allow both
displays to derive their CHT readings from the same thermo-well. For this reason, use of the Adapter Probe is
recommended instead of a Gasket Probe.
If the factory-installed CHT display has a bayonet-style probe, the Insight Bayonet Adapter Probe (2855) may
be used instead of the Gasket Probe.
The Bayonet Adapter Probe replaces the original bayonet adapter. It has a screwdriver slot to facilitate tighten-
ing in place, and placing a drop of non-seizing lubricant on the threads before installation will ease installation
and subsequent removal.
Once the Bayonet Adapter Probe has been installed, the original bayonet probe maybe locked in place with a
push and a twist.
If the factory-installed CHT display has a threaded probe located in the thermo-well, the Insight Threaded
Adapter Probe (2856) may be used. The Threaded Adapter Probe is installed in the thermo-well between the
cylinder head and the original CHT probe.
Installing The Outside Air Temperature Probe
The Outside Air Temperature (OAT) probe must be mounted in a location which is in free ambient air. Avoid
locating the probe adjacent to exhaust pipes, in a confined area, or on the top of the fuselage. Refer to Draw-
ing No. 1200-016 for the mounting dimensions and appropriate hole size to drill.
Any location where the probe is exposed to direct sunlight or radiant heat from the runway pavement, will
cause increased temperature readings above ambient temperature. Mounting the probe near the engine induc-
tion air filter will often read well as soon as the engine is started.
Mount the OAT probe in the prepared hole and secure the nylon nut being careful not to over-tighten.
If the OAT probe is installed on a pressurized aircraft where bulkhead penetration is necessary and/or potting
of the OAT probe is required, be certain to apply “Proseal” or equivalent potting substance prior to tightening.
NOTE: Be careful not to get potting substance on the connector.
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