Ken Powell wrote:

Paul,
I found that the easiest way to 'line everything up' was to build a horizonal
box around the engine using the firewall as the base. Measure the diagonals from
outside corner of the box to the opposite corner of the firewall; if this
measurement is equal then the box is square.  This is the easiest method that I
know to 'square things up'.  After the box is built around the engine you can
take measurements from both sides of the engine to the sides of the box - these
measurements should be = for both sides of the airplane.  I decided to do it
this way because I just couldn't seem to get the 'square' to the firewall.

Ken Powell

Sounds like another good idea. What is the box made out of?
Plywood I would guess.

BTW I forgot to mention the trick of building up a mock up engine
out of housings only no e-shaft or rotors. Then a piece of PVC pipe
will fit in the mains and that gives you a reference on the engine.
With a psru/mm plate bolted to it it is limited to an aft reference
(tractor).

This is what I did to align the engine with the cowl
and thrust line in my KIS Cruiser. Just so happens
a piece of 1 1/4 Sched 40 plastic water pipe fits
the rear main bearing and front cover oil seal almost perfectly.
With a hole in the center of the cowl prop opening
that also fits the pipe you are home free.
Lousy picture. My scanner color went south at the time.

Paul Lamar
 
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