Location of Exhaust Bung
RECOMMENDED BUNG
Before you begin the installation of the exhaust bung, disconnect the
INSTALLATION RANGE
negative battery cable to keep from damaging the ECM or sensors.
Carefully inspect the engine and fuel system to ensure there are no fuel
leaks in the fuel system. If a leak is found, repair before continuing with
the installation.
The oxygen sensor that will be screwed into this bung will function best
in the hottest part of the exhaust system. The closer the sensor is to
the engine the better. If you have a cast exhaust manifold, locate the
bung in the exhaust pipe downstream from the manifold flange — but
as close to the flange as possible. If you have headers , install the bung
into your collector adapter. For installation into a horizontal exhaust
pipe, it is recommended that the sensor be installed with the tip facing
downward, pointing to the center of the exhaust pipe. Figure 3 shows
the recommended installation angles for a horizontal exhaust pipe. If
the selected location for your sensor installation is vertical, there is no
EXHAUST
recommended installation angle; you will want to ensure the tip of the
PIPE
sensor is pointing to the center of the exhaust pipe. You will also need to
be sure that your selected bung location will allow installation and removal
FIGURE 3
of the oxygen sensor. Also, ensure that the sensor and associated wiring
will not interfere with other components. Also, verify that the sensor wiring
and connectors will not melt due to excessive exhaust heat. Drill a 7/8"
hole in the exhaust pipe at your selected location using a hole saw.
The room must be well ventilated and you must ensure that there are
no gasoline leaks or gasoline fumes anywhere near the room or area of
welding.
Once the bung is installed, let the weld joint completely cool before
installing the sensor. It is also recommended that you tap the bung with
a 18mm x 1.50 metric tap to eliminate any distortion that may have
occurred during the welding process.
Installation of Sensors
Install the oxygen sensor into exhaust bung. A coat of anti-seize on the oxygen sensor's threads will ease removal of the sensor
when replacement is necessary. The oxygen sensor should be torqued to 20 ft.lbs.
The intake air temperature (IAT) sensor should be located in the intake air stream. The thread on the provided sensor is 3/8 - 18
NPT (National Pipe Thread). Your engine comes with the IAT mounted in the bottom of the upper intake manifold. This is the best
location unless you are using a remote air filter with a duct from the filter to the throttle body. If this is the case, you should install
the IAT sensor in the duct near the filter. If you plan on welding in threads, a pipe nipple from your local hardware may facilitate the
installation. Additionally, some "snap-in" intake sensor are available in a number of configurations.
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Ramjet 502 Engine
IR 17FE14
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