Woodward GECO, Technical Manual, Page: 72 / 90

GECO

Stoichiometric Manual 03554
64 Woodward

An automatic shut-off for engine shutdown is
required upstream of the pressure source; when the
control loses the engine speed signal, the trim
valve(s) will close automatically as a backup.

The injection point should be chosen to provide
as much mixing as possible before the intake splits
to individual cylinders; just upstream from the
existing carburetor is ideal, but downstream may be
acceptable if long intake plumbing and/or elbows are
present before the throttle.

Injection points where oil or fuel liquids pool up
should be avoided, especially if liquids drain to the metering valve.

All threads and tube fittings must be inspected for leaks with bubble-
indicating liquids or electronic flammable-gas detection equipment.
High-temperature anti-seize thread lubricant must be used to
facilitate exhaust oxygen and temperature sensor replacement.
Temperatures at the sensor threads can be as high as 1200°F (650
°C), so the anti-seize compound should be designed for this heat
range. These products typically use copper or nickel compounds,
although copper is recommended (nickel vapor is a suspected
carcinogen).
EGO Installation
Location of upstream EGO sensor(s) should be:

In the combined exhaust stream from all the controlled cylinders or after the
turbocharger.

Within 600 mm (24 inches) of the
exhaust manifold outlet or turbo outlet.

Shielded from the exhaust pulses of
another bank or turbo (where 2 exhaust
streams join) to avoid “cross-talk”
feedback from the wrong bank.

On the top 160° of the exhaust pipe
(to avoid corrosion and thermal shock
from condensation).

Drill and spot face 15.5 mm hole in suitable location.

Tap for 18 mm x 1.5 if pipe is at least 6 mm (1/4 inch) thick, or weld internally
threaded port around the hole.

Install sensor with anti-seize thread lubricant and torque to 40 N·m (30 lb-ft).