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'94 IDIT runs rough, low power, nearly overheating after Moose IP

Discussion in '6.9L IH & 7.3L IDI Diesels' started by SLC97SR5, Sep 11, 2019.

  1. ocnorb

    ocnorb Full Access Member

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    I sure hope it's was wasn't caused by the new Delo400 as that is what I just put in my '94!
     
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  2. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    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.
     
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  3. Alwaysreadyrob

    Alwaysreadyrob 1994 7.3 TURBO IDI 4x4

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    Could it be the oil cooler wes ?
    Or thermostat sticking ? What about the fan itself ?
     
  4. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

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    I doubt it, won’t know until it’s apart.
     
  5. typ4

    typ4 Supporting Member Supporting Member

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    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.
     
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  6. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

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    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.
     
  7. typ4

    typ4 Supporting Member Supporting Member

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    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 edited: Sep 16, 2019
  8. Dieselcrawler

    Dieselcrawler i pooped today! Staff Member

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    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.
     
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  9. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

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    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.
     
  10. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

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    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.
     
  11. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    I've seen a spun bearing on a 6.9. Most likely from being run out of oil.
     
  12. chillman88

    chillman88 Supporting Member Supporting Member

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    Wait, you're supposed to check the oil level??

    LOL
     
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  13. Selahdoor

    Selahdoor How can I help you, or make you laugh, today? Supporting Member

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    Good thing I found out NOW!
     
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  14. 79GLIDE

    79GLIDE Full Access Member

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    I'll just throw this out there, but besides the previously mentioned valve train concerns, what about the condition of the camshaft?
     
  15. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    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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