MACK , (USED) 2003 Mack AI Diesel Engine, Serial # 3A0689, Engine Family # 3MKXH11.9V65, Low Miles, TEST RUN WATCH VIDEO ON JJ REBUILDERS, Fully Inspected. Visit JJ REBUILDERS for more information on this and any other Diesel Engine you may be looking for. Call 1-800-971-3019. REF INV # 004163