Q1 Plans Chapter 17 Page 17-4
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- Category: Quickie Plans
- Published: Monday, 12 May 2008 10:28
- Written by Dan Yager
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INSTALLING THE ENGINE ON THE FIREWALL
At this point, the engine should be mounted to ES2, and all of the engine mount holes must have been drilled in the firewall.
Mounting the engine on the airframe requires two people. In addition, use foam blocks, or boxes so that the engine can be rested at about the proper height in front of the firewall.
Note the installation drawing showing how each engine mount grouping fits together. Permanently mount the three groupings to the firewall by tightening the AN3 bolts that sandwich the firewall between each pair of ES3’s.
With the three mount groupings in place, position the engine so that one mount at a time can be attached to the ES2 plate/engine combination. Do not tighten each AN4’engine mount bolt down completely; rather, torque them down in sequence until all are tight.
ESM1-1 controls how tight the rubber engine mounts can be “cinched” up. Since each rubber mount is slightly different, the 1.5" length given earlier for ESM1-1 is only approximate. After the three mounts are tight, move the engine around and feel the rubber mounts work. If you can see the rubber mounts not solidly contained in ESM1, then ESM1-1 needs to be shortened some on whichever mounts this occurs on. If the rubber mounts appear to be solidly contained by ESM1, then wait until after the first engine runs to decide whether to shorten ESM1-1 & stiffen up the engine mount system. What you want to avoid is a sloppy feeling when you move the engine around with all engine mount bolts tight.
ES6, the engine lower support Bracket, mounts on both the bottom engine mount bolt on ES2, and on the two rear engine mounting lugs.
