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On most vehicles today, the crankshaft pulley acts as the harmonic balancer. It also has the grooved outer ring that the serpentine belt rides on. Between the central hub of the balancer and the outer ring is a strip of rubber that the outer ring is pressed onto. This rubber, over time, ages and shrinks. This allow the outer ring to walk inward (or outward) of the centerline of the pulley. This causes the serpentine belt to wear out prematurely and can cause the problem you describe. You need a new harmonic balancer. It comes complete with the rubber and outer ring already attached. Check your belt at the same time to see if it needs replaced as well.
most water pumps I believe have a weep hole that drips out coolant basically letting the person owning the car know that it is time to change the water pump. but then again have you checked to see if the water pump hoses are secure and aren't cracked?
remove the intake manifold ,remove radiator ,remove radiator intake and outake housing, remove fan ,remove all belts: power steering, alternator and if you have a/c, remove harmonic balancer ,remove timing belt covers, remove timing belt remove intake housinng once you have remove all the above, your freaken engine will look naked, you can see the location of the knock sensor is locate in the engine valley
i have a 1998 caravan my harmonic balancer fell off my qquestion is is there 2 separate keys that hold on the timing gear and the balancer pulley on, i have been to the dodge dealer and they printed me out pics but i still don't know for sure if the timing gear has it's own key or there is just 1 long key that holds both the timing gear and the balancer ......PLEASE HELP
You may want to have a mechanic do this, not as easy as replacing an accessory belt. But if you decide to do it you will definitley need a timing light, 3 jaw gear puller, a harmonic balance puller and many other tools most people dont have in their garage