I used Delrin pads between the engine mount and fire wall. These pads are one-inch thick to move the engine forward one inch for CG balance. The pads were cut from a scrap piece using a 2-inch hole saw. The 1/4-inch hole made by the hole saw pilot was then drilled out for the engine mount bolts. I got the Delrin sheet from a welding shop. They use the Delrin sheets to line the bed of dump trucks so the gravel and hot asphalt will not wear out the steel bed. Wikipedia lists the melting point at 175 degrees C. Delrin is super tough and hard; don't look for any rubber cushion with this material.
Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA smw...@md.metrocast.net ---------------------------------------------------------------------------- Having now checked everything after the overturn, I'm soon to start reassembling the engine mount / engine to the airframe. My aircraft has rubber pads between the engine mount and the firewall. These have hardened and split and obviously must be replaced ..... or discarded. Question. Is it normal to have rubber pads (about 1/8 inch thick) between the engine mount and the firewall? The engine mount frame has rubber bushes through which the engine mounting bolts pass. Do I also need a pad at each mounting at the firewall?? If so, will some form of rubber reinforced mat cut to shape do the job? TIA Martin Pearce
