Engines | Mounts, , (USED) 1989 Caterpillar 3406B Diesel Engine (Air to Air), Serial # 4MG74841, 425HP RATED, Test Run 2-28-17, 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 # 003219