Great Planes GPMG1041 User Manual

GREAT PLANES

ADJUSTABLE MOUNT INSTRUCTIONS

EM2048 Mount

The new Great Planes adjustable engine mount is simple and conv enient to use .This

mount will work on most .20 – .40 2-Cycles and .20 – .48 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 f or
right thrust. A template is included to make it easy to locate the mounting holes.Just 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 1/8" diameter hole at
the four pin holes and install the mount using 4-40 bolts, #4 flat washers and 4-40 b lind 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 4-40 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 3/32" hole at each mark. Put a drop of oil in
each hole and install the engine using the #4 x 5/8" screws provided.If you prefer to use 4­40 machine screws (not included) to install your engine, just tap the holes you drilled with
a 4-40 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. If your plane has a tightly
enclosed engine compartment, you may also need to carve the cowl (nose) blocks slightly
to get them to fit.

EMP01

Template