Question about 2004 Dodge Durango

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Hello, my wife overheated my 04 Durango 4.7 to the max until it shut down on her.now it's got a constant knocking sound but I can't tell what area of motor it's coming from.what could of broke.

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  • mlamas56 Mar 14, 2011

    I checked the oil and there is no signs of coolant in there

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It could be pinging from water going into the combustion chamber cause by blowing the head gasket and warping the heads as a result of the over heating. if it shut off typically the engine got so hot it started locking up from hot super thin oils poor lubrication. in another case the oil could've gotten so thin or filled with water from blowing the head gasket that it took the bearings in the crank making the rods knock. but the most common cause would be water leaking in the combustion chamber causing it to ping. which could also bend your rods or blow your motor beyond repair. i suggest mechanical attention ASAP and dont keep running it.

Posted on Mar 14, 2011

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Its very possible that one of the head gaskets are blown and leaking coolant into the Combustion chamber causing it to bend the rod or rods ! Also is there coolant in the oil ? One trick to manually find the area is to use a wood handle from a mop or broom and place on different point on the engine with your ear against the handle and note any sound differences ?

Posted on Mar 14, 2011

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  • jerry8807 Mar 14, 2011

    Since there is no coolant oil intermix its mostlikely a bent rod or scorn rod and main bearings since you are describing the sound as a knock rarher that a ping or fuel knock ! When the combustion chamber is over heated it can cause a very loud knocking noise but when the engine is allowed to cool the noise will go away until it overheats again ! If it knocks cold or warm likely the rods were bent or the bearings are gone ; in either case you are lookint at a engine replacement !

  • crzejkr Mar 16, 2011

    yes but that is only to locate the origin base area of the knock. i forget the name of it but the ear pieces with tube hose a doctor wears is ur ultimate best bet at finding the location as it isolates all exterior noise. have one in my tool collection and when its time to resort to it, it defines noises great.

  • jerry8807 Mar 18, 2011

    Stethescope ! Ive got 2 and a set of electronic wireless ears ! The broom rod is just something he can try without having to go buy a set ! I think we both agree - the 4.7 motor for some reson are prone to bent rods or damaged wrist pins from coolant intrustion ! In either case he has engine block damage and i hate to see that ! I accidentaly bents rods in one that we were intruceing trans fluid via a intale vacumm to remove carbon and didnt have the rpm's high enough and it hydo locked and bent 3 rods - ouch - to the ego and my wallet !

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