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What causes the knocking sound in the bottom of the car motor at the oil pan

(1990 Ford Ranger)
in Pinson, AL on March 12, 2012
the problem started when the car ran hot and the radiator burst with a whole in it
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on March 12, 2012
spun bearing,, bent rod, number of things.. do you have water in the oil?? if you got it hot,, you may have blown a head gasket
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on March 13, 2012
In other words,the motor is trashed.So many things can get wrecked in this scenario that only a replacement or complete dissection done by a knowledgeable mechanic can rectify.
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