7
Lycoming Angle Valve Engines
We supply a different adapter for AV engines but the threaded silver base and gold ring are installed
using the same procedure as above. Test fit the hex fitting and lower gold ring dry to check for clearance
to the cylinder head. In some cases, you may have to relieve a small arc in the head for clearance with a
Dremel tool. See photos below. These parts cannot touch the head when tight.
Once the base and ring are installed, lubricate the
top and bottom injector O-rings and slide the
injector into the lower base. We recommend you
install the upper AN fittings into the gold top cap
prior to installing the cap since you will not be able
to tighten the fitting once the cap is installed. Use
pipe sealant on the fitting threads as described
above. Tighten and clock the fitting so it’s
perpendicular to the top cap flange holes as shown
below before installing the top cap assembly to the
injector.
Apply Loctite 246 to the stainless cap screws and slide
them through the tubular spacers. Alternately start to
tighten the cap screws with an Allen wrench but stop just
before the spacers start to touch the gold parts. Rotate
the lower ring and top cap to the orientation shown
below so you can get the Allen wrench on the cap
screw. Just before the cap screws are snug, squeeze
the two spacers together with your fingers so that
they engage the lower hex. Tighten the cap screws
fully. You can rotate the injector to orientate the
connector as desired. The upper gold parts should not
rotate on the lower hex with hard hand pressure.
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