Mount the cowl using the supplied screws and washers. Place your spinner back plate over the
crankshaft or prop bolt so that it is centered. You can now just move the engine around to get
the spinner back plate centered on the cowl face.
Once the spinner back plate and engine are in the right po-
sition, remove the cowl and mark the location where the
engine is standing before removing it. You can now drill
the engine’s actual mounting holes in the firewall.
The final step is to install the engine using either blind nuts
behind the firewall or, as we show with a DA-50, bolts
through the back of the firewall into the standoffs supplied
with the engine or which you have made or bought elsewhere. Fine adjust the engine spacing so
that the spinner back plate fits perfectly by leaving the standoffs a little short and using washers
to set the final spacing.. Remember that the firewall is already set with proper thrust angles,
any drilling must be square to the firewall and not parallel with the fuselage line.
Like I said, the rest is very easy.