Mounting The Engine To The Firewall - Pipistrel Sinus Build Manual

Mounting the engine to the firewall

First cut away the firewall material where the engine mount goes. These are hardened
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points in the firewall. Carefully cut with a sharp knife and peel the fireproof material
away. You need to do this to mount the engine against a hard surface. If you go over
the top of the fireproof material it will compress over time and allow the engines to shift
and move.
Then put the mount up against the firewall and align the mounting points with the
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hardened points in the firewall. The bottom engine bolt should lie approximately 32mm
above the fuselage's inner rim. The other two mounting points need to be aligned, so
that the engine mount is in the middle of the firewall and level. Once you find the
appropriate position for the engine mount, mark the hole locations.
Drill three Ø8mm holes (upper right, upper left and bottom center) and two Ø6mm holes
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(lower left, lower right)
Insert the bottom engine bolt through the small hole in the cabin floor. It will need to be
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secured from behind and pushed forward using a socket and extender, so that you'll be
able to the tighten the nut in the front.
Mount the final bolts to hold the engine mount to the airframe.
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