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Discussion Starter · #1 ·
Here is the story. The truck is a 2000 Dodge Durango 4.7L V-8 Yesterday the engine started knocking on the bottom by the oilpan big time, so I asked my friend who happens to own a mechanic shop and the still can't diagnose the problem without removing the oilpan and taking apart alot of the motor. They called it a bottom knock. I really don't want to spend 2000-5000 on repairs or on a new motor. Does anyone have any idea what the problem could be. the engine is not missing, and the truck runs fine. Could it be some kind of bearing problem?? Need some help.
Thanks
 

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Crankshaft problem, maybe? They used to use crush type guages to check for wear clearances between the shaft and the bearing to see where the wear is and what needs replacing. Gotta open her up for that no doubt. Sounds like more than a .15 cent washer, hate to say.
 

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Could it be some kind of bearing problem??
Sure could .... connecting rod bearing or main bearing. Both are bad news, though some people have replaced bad rod bearings if it just started.

Sounds like you don't have complete confidence in your friend?

Good luck.
 

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check dodge forum like red65 said i go to them when i need info
 

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sounds like you definately have a bad bearing whether its a crank or rod bearing either way you need a new motor probably cheaper and easier just to get a good used motor and drop it in the only other thing i can think of is unless you hit the pan while driving maybe ran something over that would cause the crank to hit the pan but your friend would have definately seen that if it was the case you can try ebay motors see what they have good luck
 

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Try putting in some STP oil treatment, motor medic, or Gunk. Anything that is thick. See if that quiets it down. If it does, probably bearing, if there's no change something else. You can also do a compression check. If a rod bearing is going you will have less compression in that cylinder.
 

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Discussion Starter · #10 ·
Does the noise change when you are in gear? Does it make the noise when cranking?
no change when in gear. makes noise when startibg and when i mash the gas. quiets down when you get going
 

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quiets down when you get going
Definitely sounds like a bearing to me. At higher RPM the oil volume and pressure is greater, knock goes away.

You can probably put oil treatment in it and run it till it explodes.
 

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Sounds like you spun a bearing. Did you ever have antifreeze loss in the truck? Any intake gaskets go bad? Many times if you get antifreeze in the oil it will eat the outter surface of the bearing allowing it to slip or spin. It could be bearing wear but there is usually a reason for it to suddenly appear. With the bearing wearing out you will get a slight rod nock that gets worse. You could try a bearing kit if it is only the bearing but if there is wear on the crank or rod it would need a complete rebuild. It could also be a bent rod and not a bearing. How many miles are on it?
 

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sounds like a rod bearing, they use nylon coated timing chains, as they get old and hot they tend to lose pieces, they go down into the pan and clog the oil pump screen, less oil to be sent thruout the engine. depends on milage though, big job, better to find a junk yard motor than to rebuild the one you have.
 
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