Question about 2000 Jeep Grand Cherokee

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Hard knock sounds like its coming from engine, oil is clean no sign of antifreeze

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Could either be a cracked flywheel or an isolated bearing failure (material failure)...If your oil pressure is normal, likely it is the flywheel but you should have it checked out by someone familiar with that immediately.
Waiting is not an option with any serious noise like that.
Obviously my answer is not a "fix" but you need to know what it is before you can fix it!

Posted on May 05, 2010

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Would a rod knocking cause the oil to have milky clumps inthe oil fill but not the filter or pan even though antifreeze does not leak and the 2001 2.2l chevy s-10 does not overheat? I used lucas heavy duty...

Milky oil is usually caused from condensation from some where either antifreeze getting in, or if you are doing a lot of short drives where the engine doesn't get a chance to come up to full temperature. If there is water in your oil it will cause your knocking sound. I would change the oil and put in some fresh and see what happens.

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Sounds like either a blown motor (rings need replaced) or a bad head gasket or cracked head.
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As for oil not milky , this could still have a crack or bad headgasket just going through the exaust port in the head. As for the loud KNOCK may be your oil pump quit working, Really hard to say, Hopefully it's not ready for overhaul. Best of luck to you.

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