CATERPILLAR , (USED) 1991 Caterpillar 3406B Diesel Engine (Air to Air), Serial # 3ZJ08214, AR# 4P1081, 425HP, Test Run 12-5-16, Fully Inspected!!! Runs Perfect!!! Visit Our Website for more information on this engine or any other diesel engine you may be looking for. Call . INV # 003127