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Truck is currently at the dealer being looked at for a rattle from the engine that last 2-3 seconds at startup after the truck has sat for a couple hours or more. Sound is like shaking a can full of marbles (very similar sound to my 5.4 that had bad timing chains and tensioners). Anyone hear of anything like this on the 3.0?
 

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Truck is currently at the dealer being looked at for a rattle from the engine that last 2-3 seconds at startup after the truck has sat for a couple hours or more. Sound is like shaking a can full of marbles (very similar sound to my 5.4 that had bad timing chains and tensioners). Anyone hear of anything like this on the 3.0?
Mine gives a bit of a rattle at startup, especially when its hot and the engine has sat for a bit. I think all this is is the lifters making a bit of noise until the oil pressure is high enough to pressure them up fully. like you said only lasts a second or two. There is no timing chain on these, however there is a chain that runs between the cams that uses a hydraulic tensioner, so it could be this as well until oil pressure is up. I don't think it's anything to worry about, however let me know what your mechanic says, or if they do anything about it. With these being pretty rare, trouble is that there are no comparable units for mechanics to test out to see if it's normal. The last thing i'd want is someone tearing into my engine to try and fix something that's normal.
 

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I just got back from a 2 week trip and went out to start my truck this morning. I opened the hood and had my wife start it and there was a definite rattle for about 3 seconds then it smoothed out. Of interest is that it was quiet enough I didn't hear it until I played back the video I was recording. This was after a 14 day shutdown.

It isn't something I would be concerned about on this truck.
 
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The oil pump maintains its prime due:
1/. a non return valve in the base of the oil filter housing from the pump discharge.
2/. The oil filter housing drain line (for oil changes) - there should be a little rubber 'plug' on a spring steel 'hinge' that lifts as the filter is removed.

If either passes after a long park up you will have lost oil pump prime. You could remove the oil filter and fill the filter bowl with oil and see if it drains down - you would need to push down the housing drain 'plug'

But the oil system does drain down (after the filter housing) if left - air can enter at the cam bearings allowing the system to drain down via the main bearing clearances. So when you start it takes a second or two for oil pressure to build. The hydraulic tappets sound rattily at this point.

Info based on experience with the european versions - I have the 2.7. I have the 2.7 in bits and a range of oil system parts from the 2.7, 3.0 and 3.0 gen2 (your engines) to compare against.

Adrian
 
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