GREAT PLANES Waco YMF-5 Instruction Manual page 30

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12. Fit the plan protector film over the aft cowl mounting
ring. Mount the cowl ring to the aft mounting ring sandwiching
the film between the two rings. Use four 4-40 x 1/2" [12.7mm]
SHCS, four #4 lock washers, and four #4 flat washers to
mount the cowl ring. Mix up a batch of 30-minute epoxy and
add some milled fiberglass to it. Brush this onto the outer
edge of the cowl ring. Fit the cowl over the cowl ring until it
bottoms out on the cowl centering tool. Note: On the DLE-
30, reinstalling the muffler will help ensure that the cowl is
properly positioned.
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13. When the epoxy is fully cured, remove the four screws
holding the cowl in place and remove the cowl. Discard the
plan protector film. Mix up another batch of epoxy and milled
fiberglass. Apply a continuous bead of this on the front side
of the joint between the cowl and the ring. This will reinforce
the cowl ring. Note: You may apply epoxy to the rear side of
the cowl ring, but this must be a very thin layer without much
of a fillet at the joint of the cowl to ring. Otherwise, this would
interfere with the aft cowl ring.
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14. Install the muffler and choke linkage (if applicable).
Install the cowl and make any additional holes to access the
needle valves. We set up a mechanical choke linkage by
using a scrap piece of pushrod wire and a servo mounting
grommet as a bushing in the cowl.
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15. Trim the center of the dummy engine to clear the
crankshaft of your engine. Cut away the open area between
the dummy cylinders to allow cooling air to flow over the
engine. Test fit the dummy engine in the cowl and then fit the
cowl to the fuselage.
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16. Pushrod tubes are included to help detail the dummy
engine. Drill holes in the bottom of each rocker cover with a
corresponding hole in the crankcase. Fit each tube and glue
it in place from the inside with R/C-56 canopy glue.
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17. Align the dummy cylinders with the cowl blisters and
glue the dummy engine in place using R/C-56 glue or epoxy.
Install the cowl using a drop of thread locking compound on
the screw threads for added security.
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18. Install the prop and tighten the prop bolts or prop nut.
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