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Free 5.9 with rod knock

YY1

YY1

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So a few years ago I was given a 5.9 Magnum nearly complete.

It was removed from a Durango because it had a "slight" rod knock.

Is there a certain rod bearing that goes bad on theses or is it just as likely to be any one of them.

I'd like to tear into it but would love to start with "the bad one" if it's possible.
 
No "common" rod bearing that goes bad>. Never heard of something like that ever. Why only "the common one" ? Not wanting to refresh engine only patch it ?
 
Flip that thing over and start pulling caps off until you find the bad actor....Had a 2000 Durango 5.2 that sounded like a main bearing knock. It was very faint but it ran well over 100k miles until the X decided she didn't want to stop when a coolant leak developed. She drove it until it seized. I ordered it new with all the heavy duty stuff including LSD and 3.90 gears. Oh well.
 
Since they have a reputation for NOT needing rings, I'd like to do just rod bearings, and might even try just that one.

I suppose I should look at them all.
 
These are individual engines . The reason for the reputation of little ridge in the cylinder bores is because of the fuel injection which would limit excess fuel washing the oil off of the cylinders. Not all are the same though. Can't really assume anything and be safe.
 
YY1 said:
So a few years ago I was given a 5.9 Magnum nearly complete.

It was removed from a Durango because it had a "slight" rod knock.

Is there a certain rod bearing that goes bad on theses or is it just as likely to be any one of them.

I'd like to tear into it but would love to start with "the bad one" if it's possible.
Click to expand...
To the best of my knowledge there is no one bad rod. If you are going in it why not go all the way and rebuild it?
 
I purchased a Durango with a rod knock. When I pulled the 5.2 engine out to rebuild, with 130K miles on it, I found all rod bearings were worn down to the copper. I rebuilt a 5.9 out of a Ram 1500 with about 110k miles on it and found all rod bearings were worn down to the copper just showing. It was not knocking yet. I was just surprised to see how worn these bearing were considering the miles on these engines. These engines weren't sludged up either.
 
Last edited:
Interesting.

I've never heard that about Magnums before.
 
My son pulled a 5.9L out of his 98 2500 HD with 230K on it (a 5,400lb work truck).
No cylinder ridge and everything was in good shape it ran perfect.
The only reason for pulling it was the studs on the exhaust manifolds were mostly broken or rusted out.
I had a set of heads ready to put on for him, but he found an amazing 5,000 mile motor from a rollover that had been on a pallet for about 20 years.
Literally a new engine.
 
There is nothing inherently wrong with rod bearings in Magnum's lots of them go 200k easily. Kinda got sidetracked.
 
Pushing 400k on my 5.9 magnum no overhaul, uses a quart to 1500 consistently but been a very good engine..
 
I was just wondering if there was anything (hypothetically) like-

The #2 rod beating gets oil from an odd passage that can get plugged.......

...or anything like that.
 
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