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Using a drill with a 5/32" diameter drill bit, drill a hole through the
firewall at each of the four intersecting lines.
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Remove your engine from the engine mounting beams and install
them onto the firewall, using four M3 x 18mm machine screws, four M3
flat washers and four M3 blind nuts. Tighten the screws firmly to draw
the blind nuts into the back of the firewall.
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Note that the engine mounting beam with a notch in it is mounted
on the right side of the firewall.
STEP 2: INSTALLING THE ENGINE
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IMPORTANT
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The 3-5/8" measurement is not set in stone. Frankly, for this airplane, it's not very critical. If you need to move
the engine forward (to clear the rear-mounted carburetor of a four-stroke engine, for instance) it won't cause any problem.
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Using a pencil, carefully mark the locations of the engine mounting holes onto the engine mounting beams.
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Install a propeller onto your engine, then set your engine onto the
engine mounting beams.
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Using a ruler, measure the distance from the firewall to the back
edge of the propeller (nearest the hub). Adjust the depth of the engine
so that the measurement is 3-5/8".
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Remove the engine and drill 5/64" diameter pilot holes through the
engine mounting beams at the marks you drew.
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IMPORTANT
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Be careful that you drill the holes straight down
and not at an angle.
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Carefully enlarge the 5/64" diameter pilot holes, using a 1/8" diameter drill bit.
Continued On Next Page
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