Engine failure, knocking or rod bearing

On October 15, 2015, Fiat Chrysler Automobiles, US LLC, (FCA), submitted a Defect Information Report (DIR) to NHTSA regarding an air-conditioning suction/discharge combo line routing condition that may result in engine compartment fire in approximately 75,574 model year (MY) 2015 Jeep Cherokee vehicles equipped with 2.4L engines and built from October 1, 2014 through June 18, 2015 (NHTSA Recall 15V-676, FCA Recall R57).According to FCA's DIR, a misrouted A/C combo line can be pinched and cut or thermally degraded by the exhaust manifold heat shield, potentially resulting in loss of air conditioning, smoke and/or fire from ignition of leaked A/C refrigerant oil onto a hot exhaust manifold.The recalled vehicles will be inspected for misrouted A/C combo lines and those found to be misrouted will be replaced.FCA estimates that one percent of the recalled population may be affected by the A/C combo line routing defect.ODI?s analysis of warranty data provided by FCA in response to the information request letter for PE15-003 identified a spike in claims related to the A/C combo line leakage in vehicles equipped with 2.4L engines built after October 1, 2014.FCA implemented its final process corrective action for the hose routing concern on June 18, 2015.The 113,034 MY 2015 Jeep Cherokee vehicles equipped with 3.2L engines have different A/C line routing configurations and are not affected by the A/C combo line routing defect.FCA provided a total of 220 warranty claims potentially rel

ANALYSIS:MANY OF THE REPORTS INDICATE THAT THE PLASTIC VALVE COVER OR THE\TV GASKETING MATERIAL LOSES ITS STRUCTURAL AND/OR SEALING INTEGRITY DUE TOTHE HIGH ENGINE TEMPERATURES ASSOCIATED WITH THE AMC 258 ENGINE.TESTINGPERFORMED BY A LOCAL FLEET CLEARLY DEMONSTRATED THAT UNDER NORMAL DRIVINGCONDITIONS, MOTOR OIL LEAKS IN THE VICINITY OF THE #3 OR #4 CYLINDERS (OVERTHE EXHAUST MANIFOLD) CAN RESULT IN A FIRE SERIOUS ENOUGH TO DESTROY AVEHICLE.AMC HAS ISSUED NUMEROUS TSB'S REGARDING THE PROPER/IMPROPER METHOD OF SEAL-ING THE VALVE COVER-HEAD INTERFACE.1981-84 AMC 6-CYLINDER ENGINES AREEQUIPPED WITH A PLASTIC VALVE COVER WHICH HAS 5 GUIDE PINS AND 2 FASTENERS.THE COVER USED IN LATER MODELS WAS RE-DESIGNED TO HAVE 5 ATTACHING POINTS,AND THIS NEW VALVE COVER CAN BE USED ON OLDER ENGINES BY MEANS OF AMODIFICATION KIT.AS EXPECTED, COMPLAINTS OF ENGINE FIRES IN 1985 MODELSDROPPED SIGNIFICANTLY, INDICATING THAT THE ADDITION OF THE NEW VALVE COVERMAY HAVE SOLVED THE PROBLEM.STATUS: IR TO THE MANUFACTURER SENT 12/1/87.PROPOSED ACTION: OPEN AN ENGINEERING ANALYSIS.===