Engines | Mounts, , (USED) 1989 Caterpillar 3406B Diesel Engine with Jake Brakes (Air to Air), Serial # 4MG56604, AR# 7E2278, 400HP, Test Run 10-26-16, Fully Inspected!!! Runs Perfect!!! Visit JJREBUILDERS.COM for more information on this engine or any other diesel engine you may be looking for. Call 1-800-971-3019. INV # 003083