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post #2 of Old 11-18-2006
the pointy end is the bow
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Knocking is usually bad. I would work on identifying the source before I ran the engine too much more. You can use a big screw driver as a stethoscope (sp?). Hold the handle against your ear and put the tip of the screw driver on different parts of the drive train to try and isolate the source. Might also temporarily disconnect v-belts to accessories, uncouple the drive shaft shaft to further isolate the source. Main bearings and rod bearings are an expensive source of knocking noise and hopefully you can rule those out.

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