Engines | Mounts, , (USED) 1981 Mack EM6 285 Diesel Engine with Tip Turbine & Air Box (MECHANICAL FUEL PUMP), Serial # 4M394D, 283HP@2100RPM, Displacement 672, Test Run 6-28-17. Visit JJREBUILDERS . COM for more information on this and any other Diesel Engine you may be looking for. Call 1-800-971-3019. ref INV # 003394