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Broken crank

Discussion in '7.3L Powerstroke Diesels' started by trythis, Sep 14, 2019.

  1. trythis

    trythis Full Access Member

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    I bought this 95 powerstroke for parts because it's got a broken crank otherwise it's a nice looking truck 300000 mi automatic transmission never even got to talk to the owner just wondering why the crank broke at 300,000 miles

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  2. greenskeeper

    greenskeeper Full Access Member

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    First time I've heard of a broken crank on a 7.3

    First thing that comes to mind is too much tuning
     
  3. trythis

    trythis Full Access Member

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    I don't have the experience that you obviously do but I have never heard of one either I have not pulled the pan the garage I got the truck from pulled the tranny and determined that it was a broken crank .
    It was suggested that possibly a bad harmonic balancer.
    I have heard of that being a problem on big trucks.

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  4. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

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    I’ve seen one fail, but it broke the counterweight off. It was making over 700hp and spinning a lot of rpms.
     
  5. trythis

    trythis Full Access Member

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    Well that is really interesting I think I'm going to have to look into this a little more see this broken crank for myself


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  6. trythis

    trythis Full Access Member

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    Okay you guys want to see a 7.3 hit 3,000 RPMs with a broken crank? I'll admit it does sound a little rough but please you tell me.

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    Last edited: Sep 19, 2019
  7. trythis

    trythis Full Access Member

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  8. trythis

    trythis Full Access Member

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    Hope you do better loading those videos than I do what no fun took a long time.
    I think the point is it's not a broken crank it is a bad misfire for whatever reason.
    I never have had a crank break but it looks to me like first thing you probably would have bent pushrods and never be able to get it started.

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  9. 79jasper

    79jasper Chickenhawk

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    Dount it's a broken crank. I thought you literally had the engine apart with a snapped crank.
    Pull the flywheel inspection cover and look at the flywheel. Real common for one to break around the bolt flange.

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  10. trythis

    trythis Full Access Member

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    This is an automatic and the tranny is out.
    Guess I don't understand if that flange was broken how would it crank I will take another look.

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  11. trythis

    trythis Full Access Member

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    I couldn't see anything maybe you can point something out in the pictures IMG_20190919_204005250.jpg IMG_20190919_204021777.jpg

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  12. trythis

    trythis Full Access Member

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    Yes 79jasper I was getting a little bit sarcastic I could have led you astray.
    I have just really been confused as to why this garage that sold me the truck seem to really believe it had a broken crank.
    I am now convinced after running it without the transmission hitting 3000 RPM several times that it's not broken crank.
    It does have some hard start issues.
    So the transmissions laying in the bed of the truck I guess I'm going to gird up and try to stick that thing back in there this is just too good a truck part out, I mean even the AC works on it what can I say. If it comes apart I'll get you some good pictures.
    My thanks to all of you for chiming in you're a great bunch

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  13. greenskeeper

    greenskeeper Full Access Member

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    cracked flex plate....changing out the flex plate in my 97 right now....simulates a broken crank/bearing easily
     
  14. MeanGreen96

    MeanGreen96 Registered User

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    I actually had this happen on my 94 idi, my fly wheel broke around the bolts to where i thought i had busted my crank, i had taken a pry bar and tried to rotate the fly wheel and watched it move over an inch so i thought my motor was toast at 255k ,now i couldn't see it while transmission was in but i had the grinding sound/knocking off and on before it jammed on the starter and stalled my truck. At this point i had decided to part the truck since i wanted a 4x4 and this truck was rusted out pretty bad.
     
  15. trythis

    trythis Full Access Member

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