Great Planes PT-17 Stearman .91-1.20 ARF - GPMA1349 - Manual (Page 19)

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5. Slide the cowl over the engine followed by the dummy
radial engine. Note: Position the dummy radial engine so
that the top of the elongated shape of the front of the cowl
is at the twelve o’clock position. Cut the dummy radial
engine as needed until the engine fits into the cowl and the
thrust washer on the engine extends through the front of the
dummy radial engine. Cut small amounts of the dummy
radial engine at a time. When complete there will only be a
small amount of the back of the dummy radial engine that
needs to be cut away.
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6. Drill two 1/8" [3mm] holes into the base of the cylinder
and a hole into each rocker cover.
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7. Insert an aluminum tube into each of the holes.
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8. Turn the dummy radial engine over. Check to be sure
that the tubes extend into the inside of the dummy radial
engine. Glue the tubes to the dummy radial engine with a
mixture of microballon filler and 6-minute epoxy.
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