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1993 6.9 IDI Compound Turbo ZF5 Manual Bricknose Bronco Build

Discussion in '6.9L IH & 7.3L IDI Diesels' started by Ace Perkes, Oct 10, 2020.

  1. Ace Perkes

    Ace Perkes Registered User

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    Haha she was fine with 1, when I rolled the second one in (rim installed), she said really you need all the tires in the house!? And I quickly had to move the first tire back out to the shop.
     
  2. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    LOL
     
  3. IDIoit

    IDIoit MachinistFabricator Supporting Member

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    cool build, ill be lurkin.
    BTW i can confirm a head bolted 7.3 can handle 20 psi.
     
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  4. Ace Perkes

    Ace Perkes Registered User

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    Okay, here comes the fun stuff. Disassembled and head studs installed. Flywheel, clutch, and the lack of any sludge in the valve train.

    Any wisdom is appreciated. Ex. What else should I replace while motor is out, etc. [​IMG]
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  5. Ace Perkes

    Ace Perkes Registered User

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    Another piece of evidence that this is an 87,000 mi motor is the crosshatching on the cylinder walls. Though the RH rearmost piston has some scaring on the head of the piston but no scoring on the cylinder walls whatsoever. Advice on replace or use? Structural integrity compromised?[​IMG]
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    This is the only cylinder with markings^
     
  6. hesutton

    hesutton The Anti-Anderson Supporting Member

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    Looks like that cylinder ate a glow plug.

    I'd check the valves and heads in general really well. Never a bad idea to replace the front and rear main seals. Easier to do with the engine on a stand than in the truck. Same is true for the oil cooler.

    Heath
     
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  7. Ace Perkes

    Ace Perkes Registered User

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    That is what me and my dad were thinking. But the heads show no damage and all valves hold soapy water. I’ll do a pop test before installing.

    And yes I have the front and rear seals that’s a must. Then I will reseal the oil pan as well.
     
  8. IDIoit

    IDIoit MachinistFabricator Supporting Member

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    i would reseal front cover and put a new water pump on.
    not a fan of using worm clamps on plastic nipples
    also, get 7.3 rockers
     
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  9. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    First off: I may be wrong here. There's the disclaimer. I have to disagree with this. When I enlarged the picture, the "markings" don't look like they're indentions. They look like they're raised. I'm going to guess that they are some type of carbon build up and that you can scrape them off (gently) and you'll find that there's not any damage to your pistons.
     
    Last edited: Dec 2, 2020
  10. IDIoit

    IDIoit MachinistFabricator Supporting Member

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    and im going to have to disagree with the both of ya :fart

    those markings are WAY too uniform to be carbon,
    and not the damage ive seen due to a lost glow plug tip.

    i will place a friendly wager that there was a 1/4-20 nut that got in there.:cheers:

    #7 piston
     
  11. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    Would that have been able to get through the valves? There's no scarring on the cylinder wall and it doesn't look like there's much if any damage on the bottom of the head.
     
  12. IDIoit

    IDIoit MachinistFabricator Supporting Member

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    anything is possible but it sure does look like a nut of some sort to me.
    maybe a glow plug controller trigger wire nut?
    just has an odd pattern for me to call it carbon
     
  13. pastorjeep

    pastorjeep Full Access Member

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    Get it to TDC and clean it to look for a more distinct pattern.
     
  14. Ace Perkes

    Ace Perkes Registered User

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    Okay I’ll go out tonight and clean it and report back. Thanks for all the advice.
     
  15. Ace Perkes

    Ace Perkes Registered User

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    Also it was odd that this cylinder is shiny and the others are covered in soot.
     

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