J.P. Instruments Slim Line Gauges Installation Guide - Manual (Page 4)

INSTALLING THE SLIM LINE® INSTRUMENT SERIES PAGE 4 OF 14
REV B
Alternate Oil Probe
Location
Oil Probe Location
Continental Engines
Alternate Oil Probe
Location
front view
Continental Engines: The PN 400505--C probe is for all Continental direct drive engines and is installed in the
left (pilot side) front oil galley by removing the existing 3/8 or 1/8 inch NPT plug (see figure above) located on
the front, pilots side of the engine. Insert the optional JPI oil probe supplied in the kit. For 3/8 inch NPT
installations, use the supplied brass adapter. An alternate location is on the top, front of the engine on the pilot’s
side, where the probe is inserted vertically. There are two 1/8 NPT plugs close together. Install the probe in the
position that is above and to the rear of the nearby position. Check for oil leaks before first flight.
9) Radial Engines
Radial engine exhausts require a larger EGT clamp (supplied) to fit the 2.5 inch exhaust pipe. The EGT probe is
installed using the same technique as on a Lycoming or Continental engine and should be placed between the
exhaust pipe flange and the accumulator at a distance of 2 to 3 inches from the engine exhaust flange. Cylinder
head temperatures are measured with a spark plug gasket type probe placed under the front sparkplugs. Front
spark plugs will read 15 to 20 degrees cooler than the rear plugs. Do not route the wire adjacent to or in the
ignition harness. Do not extend thermocouple wires with copper wire.
10) Outside Air Temperature (OAT) Probe Installation
Install the OAT probe, PN
400510 in the airframe
manufacturer’s
recommended location. If
this information is not
available, place the OAT
probe in clean airflow such
as in a cabin air scoop or
below the underside of the
wing away from engine heat or exhaust. In this case it is recommended that the installation be done similar to
the antenna installation instructions of AC 43.12-2a Acceptable Methods, Techniques and Practices.
The outside aluminum shield tube is used to both hold the probe in place and shield it from radiated heat. When
testing the OAT shield the sensor from direct sunlight and engine heat.
washer
aircraft sheet metal
washer
probe
shield tube
used to secure
probe