Model Tech P-47 Thunderbolt Instructions For Final Assembly page 32

Step 2: Installing the Engine Mount Beams
Remove the engine mount beams from your engine and clean off any dried C/A from the engine mount beams and the
bottom of the engine mounting lugs using a modeling knife.
IMPORTANT
If you are using a short engine like a .61 two stroke or a new-generation .91 two stroke in a sixty-one size case, then you
should drill and install the plywood spacer (D23) between the motor mount beams and the firewall in the next procedure.
Step 3: Aligning & Installing the Engine
WARNING
Do not measure out from the plywood spacer. Make sure you measure out from the firewall.
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Using a drill with an 11/64" drill bit, drill a hole through
the firewall at each of the four intersecting lines.
Install the engine mount beams using four 4mm x 30mm
socket-cap screws, four 4mm flat washers and four 4mm blind
nuts. Tighten the screws firmly to draw the blind nuts into
the back of the firewall.
Notice that the engine mount beams are mounted on their
side so that the engine will be installed on its side.
Set the engine on the engine mount beams. Using a
ruler, measure the distance from the front of the firewall to
the front of your engine's thrust washer. Adjust the depth
of the engine so that the measurement is 5-5/8".