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If your sure it's a rod bearing, Then the rod bearing has either spun in the rod cap are just beat the rod bearing out from lack of oil. The engine will need to be pulled out, tore down and inspected real good to find out what caused it in the first place.

You will then find out that you need to put a crank kit in it and recondition Rod / rods.

Also replace oil pump ect...

Your best bet would be to find enother engine that you can HEAR RUN and buy it. Are you can rebuild your old one correctly for about 1500 $s if you do ALL the work.

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Q: 1998 Chevy Silverado truck has piston rod knocking noise what is the problem?
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