The Lord anti-vibration plate and assembly comes pre-drilled to a point. The only holes needing to be drilled are the 4 ea. rubber Lord mount retaining holes for all 6 rubber Lord mount.

For best results, it would be recommended to use a drill press as a hand drill sometimes wanders off center or out of perpendicular.

Repeat this process for all six anti-vibration rubber Lord mounts until all six have been bolted into place. Be sure add the washers & nyloc nuts and snug them down before continuing.

As of February 2005, QC has been shipping the Rotax 503 engines with the eight (8) Lord mounts instead of the six (6).

The motor plate with Lord mounts will now be bolted to the engine. "PROPER TORQUE AS SPECIFIED IN THE ROTAX MANUAL" must be used on the 4 engine mounting studs and metric nuts on the Rotax block. Be sure to use "BLUE LOCTITE" on the engine mounting bolts. The metric nuts and lock washers should come with the engine and packed with the carburetor. Then the 8 ea. AN4-16A bolts that go through the Lord mounts can be dropped down through the corresponding 8 holes in the 2" angle plate.

Work from "right" to "left".

CAUTION: If the entire assembly is performed prior to mounting the engine on the motor mounting plate, this will leave no way to torque the 4 engine nuts.

Once the mount is installed, you can install a couple of 1/8" by 1/2" grip range SS rivets through the motor mount angles into the 1-1/4" square spacers between the angles and the root tube. Two rivets per side will hold the spacers in position for future removal and assembly of the engine on the airframe without having to fuss with them again. We usually will do this mod with the entire engine and mounts sitting on the bench in the shop. That way, we simply have to hold the engine in place under the root tube and align the 5/16" holes just long enough to install our extra long phillips head screwdriver for temp. holding.

Using an engine stand will make mounting the engine an effortless, one man job. Just place the handle of a hammer under the rear of the engine, roll the engine into place and just drop the tail of the plane until the root tube lines up with the rear AN5-52A, 5/16" bolt hole and slip the bolt into place. Then raise the tail just a little and the front AN5-52A, 5/16" bolt hole will line up, insert the AN5-52A, 5/16" bolt.

Complete the above "Angle Brackets to Root Tube" procedure prior to following the "One Man Install".

This assembly requires two persons (or an engine stand). Assemble the Lord mounts to the motor plate, install the motor plate to the Rotax engine using proper torque on the four studs and nuts. Although the manual calls for Red Loctite, we recommend the use of "BLUE LOCTITE" on the engine mounting bolts. Install the two, 2" angle plates to the Lord mounts using the 8 ea. AN4-16A bolts and tighten. Lift the engine up to the root tube and install the two spacers and AN5-52A, 5/16" bolts. A long taper punch works well here to help get it all lined up and to take some pressure off.

It is a lot easier to install the complete motor mounts to the engine and then mount it to the airframe than it is to attempt to hold the motor in place and install all eight of those bolts through the lord mounts. Here's the trick: While holding the complete engine WITH complete mount in position for the root tube, simply install a long phillips screwdriver in one of the 5/16" holes. This will hold the engine in place while you install the bolts one at a time. You can also use a quick grip clamp to sandwich the angles in place for proper alignment for inserting the actual mounting bolts. That's 2 bolts versus 8 bolts. Much easier.

NOTE: The two "AN960-516 LARGE AREA WASHERS" are used below the two rubber Lord mounts on the inside of the mount, toward the fuselage.