Great Planes Adjustable Engine Mount .40-.70 - GPMG1061 - Manual

GREAT PLANES
ADJUSTABLE MOUNT INSTRUCTIONS
EM4070 Mount
The new Great Planes adjustable engine mount is simple and convenient to use.
This mount will work on most .40 – .60 2-Cycles and .40 – .70 4-Cycles.
INSTRUCTIONS:
Cut or break the “spreader bar” off each mount half. Carefully trim any extra
plastic off each mount half left by the spreader bar. The surfaces where the spreader
bars were attached need to be very smooth to allow the mount halves to fit together.
Also trim the flashing off any other rough edges. Snap the two mount halves together
as shown in the sketch below.
Determine where the mount should be installed on the firewall. It will usually be
positioned either on the firewall centerline or slightly left of the firewall centerline to
allow for right thrust. A template is included to make it easy to locate the mounting
holes. Cut out and position the template on the firewall and tape it in place. Poke a
T-pin though the template to accurately mark the bolt locations on the firewall. Drill a
5/32" diameter hole at the four pin holes and install the mount using 6-32 bolts, #6 flat
washers and 6-32 blind nuts. (Not included.) The length of the bolts will be determined
by the thickness of the firewall. A 1/4" firewall will usually require 7/8" long bolts. Do
not tighten the bolts all the way yet.
Slide the mount halves apart until the engine mounting lugs will sit flat on the
beams. Adjust the mount until the firewall centerline (or offset line) is centered
between the “tick” marks on the mount. Tighten the 6-32 bolts to hold the mount halves
in position. Determine how far forward the engine should be positioned on the beams
and mark where to drill the mounting holes. Remove the engine and drill a 7/64" hole
at each mark. Put a drop of oil in each hole and install the engine using the #6 x 3/4"
screws provided. If you prefer to use 6-32 machine screws (not included) to install your
engine, just tap the holes you drilled with a 6-32 tap. You may trim the front of the
mounting beams off flush with the front of the engine mounting lugs if necessary, due
to space limitations.
EMP03