Engine Installation - Carf-Models Extra 330sc Assembly Manual

Engine Installation

Parts Required:
Cowl Assembly
•
Engine Mounting Parts Bag
•
Engine
•
Tools Required:
Electric Drill
•
Drill Bit various
•
Square (rule)
•
Steel rule(s)
•
Level
•
Masking tape
•
Marking pen
•
The engine installation requires that the cowl assembly be fitted first.
In order to obtain correct engine to cowl alignment, you will need to
get some reference marks that can only be obtained when the cowl is
complete and fitted. The engine dome has right thrust already built
into it, so all you need to do is find the centre of the spinner and
transpose the information to the firewall, you will not need to calculate
the engine offset. The Extra 330SC cowl is shaped to accommodate
a 5 spinner, and correct alignment will enhance the appearance
when done correctly. First up you need to attach the cowl assembly,
and transpose the spinners centre from the cowl to the fuselage fire-
wall. It s not really that difficult, but you may want another set of
hands available to assist you.
It s much easier to just use the bottom portion of the cowl, while this
makes the process look a little simpler, the cowl can change it s over
all shape when both halves are joined, resulting in an incorrect spin-
ner to cowl alignment. So, if you can manage, try and get the required
marks with the cowl fully assembled, but if you find it too difficult, just
use the bottom half, but double check your marks with the cowl full
assembled.
First up you need to mask off the ply firewall on the fuselage, then fit
the cowl securely. Next, we are aiming to image the spinner centre
from the cowl onto the firewall. To do this we will need a square and a
small steel rule. Place the small steel rule across the horizontal centre
line in the spinner area of the cowl (use double sided tape to hold in
place). Using your square set flat against the firewall, find the horizon-
tal line as indicated by the small rule, and make a mark. You have
now found the horizontal line for the engine.
To find the vertical line place the square horizontally flat against the
fire wall, and move into the spinner centre position, mark this position
on the firewall. Now that you have a vertical and horizontal mark, you
can now use these marks to draw out the position of the engine. Re-
move the cowl and get ready to mark out the engine placement. Use
the seam line of the fuselage as reference, but you can also place a
small level on the wing tube socket in the fuselage make sure every-
thing is level.
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