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Discussion Starter #1
My Dakota has 146 K on the 3.9. The motor runs real good, but has a little rattle type sound at low rpm's. It's not a knock & sounds like it's near the front of the motor. Once it's reved, it seems to go away. What could it be?
 

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#19 ƃop ǝnןq ǝןʇ&#
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Timing chain hitting inside of cover. You will need to get updated chain & tensioner. The only place I found the one for mine was the dealer. Was not expensive.

I had the same noise...replaced the parts inside, noise gone
 

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Diesel Mechanic
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x2 for timing chain
 

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Discussion Starter #4
Drove truck tonight. The drive belt has started squeaking, even at idle. Drove it about 20 miles & sounds like maybe one of the belt idler pulleys is bad. After driving at 55 mph, for say 8-10 miles, the belt sometimes makes a terrible noise. Like a pulley is trying to stop & the belt is still going. Can also hear what sounds like a bearing squial at the same time. After slowing down, it doesn't do it very much. I'll check that in the morning. The slight rattle is still there, so I'll order a timing chain for that.
 

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#19 ƃop ǝnןq ǝןʇ&#
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Don't forget the tensioner from the dealer

Sounds like your other noise may be a bad belt, water pump, or a pulley. Tensioner could be weak also. You are gonna have the water pump off anyway to change the t-chain & tensioner, you might as well replace it.
 

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Discussion Starter #6
UPDATES: Just yesterday (1/30) I replaced the timing chain & added a new tensioner. The rattle is gone. Truck has 146K on it & I don't think it had ever been replaced. Chain was worn out worse than any I had ever seen. Also installed a new idler pulley & belt. Truck is running better than ever now.
 

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SQUEAKY alternative!

About every 6mos or so my belt startes squeaking and the fix is a wire brush to remove the rust in the serpentine grooves on all the steel pulleys.
 
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