Discussion in '6.9L IH & 7.3L IDI Diesels' started by SLC97SR5, Sep 11, 2019.
I sure hope it's was wasn't caused by the new Delo400 as that is what I just put in my '94!
It shouldn't have anything to do with it. Delo is a good oil. It could be neglect/abuse by a previous owner and it's just starting to rear it's ugly head now.
Could it be the oil cooler wes ?
Or thermostat sticking ? What about the fan itself ?
I doubt it, won’t know until it’s apart.
The only way you're going to get bearing metal that's magnetic is if it spins a bearing in the rod or in the block. You could have a cam going flat too. although it's extremely unlikely.
To me the black smoke says fuel system that is not working correctly that's just not right.
Thats not accurate, idit rod and main bearings are magnetic, and just minor wear will produce magnetic material. Spun bearings don’t happen often in these engines, I’ve now seen it only twice and both in idit engines, but out of many many IDIs that have come through my shop. It would be worthwhile to cut open the oil filter while you’re diagnosing things.
I don't think the aluminum surface of the bearing is magnetic. Or the copper underlayment.
I'll get back to you on the layers.
Usually fuzz on the drain plug is gear train wear.
Last 7.3 I killed, had 240-250 numbers in the middle 4 cyls, 320-375 on the outside 4. Lots of metal fuzz on drain plug and in filter. Bearings were perfect. Cyl walls not so much. Oval cyls don’t work well.
It’s an aluminum alloy that has some carbon, I scraped off some material (above the copper layer) and everything was magnetic, not super magnetic but it will stick to a magnet.
That’s an odd failure, typically it’s the back two that are the lowest and it gets better further forward. Interesting thing about cylinder and piston wear, is even if you shatter a piston like I did, the oil control ring keeps all the metal out of the pan, on the shop trucks idit that got hurt from a nitrous backfire it broke out the top two steel ring lands, both compression rings and big chunks of the piston. All that stayed out of the pan until I pulled the heads and popped the piston out, all the pieces that had stuck between the lip of the cylinder and the bottom ring went everywhere, engine ran like that for months with the rear pistons broken and didn’t have anything on the drain plug. #7 and #8 both had zero compression.
I've seen a spun bearing on a 6.9. Most likely from being run out of oil.
Wait, you're supposed to check the oil level??
Good thing I found out NOW!
I'll just throw this out there, but besides the previously mentioned valve train concerns, what about the condition of the camshaft?
These engines use roller lifters so, aside from a lifter failure, there just isn't much that goes wrong with the cams. I suppose that lack of oil could damage the bearing surfaces.
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