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Detroit Diesel 6-71ti starting issue

Discussion in 'Engines' started by Posterboy91, Jan 23, 2019.

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  1. Posterboy91

    Posterboy91 New Member

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    so I did this and the engine starts on the first crank. issue im having with the other engine now is that I can make full rpm out of gear but ounce the engine is under load im down about 350-400 rpm. I just had the props sent out and redone and changed the turbos out for new ones with no change. suggestions?
  2. Pascal

    Pascal Senior Member

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    Throwing parts at a problem is a lousy way to diagnose an issue a good DD guy will likely solve quickly. Props aren’t going to cause a sudden 400 rpm loss unless they re mangled up.

    Start with the basics. Fuel filters (prim and sec), rack etc.
  3. Capt J

    Capt J Senior Member

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    Need to get a good Detroit Diesel guy out. But if the props didn't hit anything, the turbo's looked fine, you either have a bad injector or dead cylinder to lose 350-400 rpms usually.
  4. Pascal

    Pascal Senior Member

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    If you had a dead cyl or injector, taking exhaust manifold temp with an IR thermometer will show you which one is not firing at 100%
  5. Capt Fred

    Capt Fred Senior Member

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    The IR guns are cheap at Harbor Freight, about $20 and are a good tool to have on-board for trouble shooting.
  6. Boomer

    Boomer Senior Member

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    He said he had his props redone...did they change the pitch on them?
  7. Posterboy91

    Posterboy91 New Member

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    yes they were changed from 24x26 to 24x24
  8. Boomer

    Boomer Senior Member

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    Scratch my thought...if you went the other way, that would have caused your issue
  9. Capt Ralph

    Capt Ralph Senior Member

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    You kids are on this.