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Pump timing issues

Discussion in '1982-Present GM Diesel' started by tRustyK5, Sep 30, 2003.

  1. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I have my pump timed a little too advanced I think. It sounds like a friggin Cummins, kind of annoying really. Any harm running this way or should I back it off a little?

    Also it's a bit of a bear to start since i got it back going again. I'm gonna check the Racor for a little trapped air but other than that I can't think why it would be harder than normal to start. The GP's are manual control now and they're 60G AC's so they couldn't possibly be burned out...

    I do get the occasional surge while driving. /forums/images/graemlins/thinking.gif That's usually caused by a bit of air isn't it? I don't have any visible leaks anywhere...

    Any thoughts?

    Rene
     
  2. BlueBlazer

    BlueBlazer 1/2 ton status

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    Line the marks up and leave it be. You got a J code engine which already makes decent power for a 6.2, no reason to jeopardize your engine to get a few more hp by advancing the timing. If you really need more hp out of a 6.2, a turbo is really the only way you can do it, but leave pump timing alone IMHO.
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Thanks Tyler. /forums/images/graemlins/thumb.gif

    The only reason I had it advanced was to compensate for possible timing chain stretch and to help with emissions. I do think it's too far past the mark to be healthy though.

    I'll move it back most of the way, see how it does 1/32" past the mark. It's currently 1/8" past. /forums/images/graemlins/eek.gif

    Rene
     
  4. BlueBlazer

    BlueBlazer 1/2 ton status

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    Sounds good /forums/images/graemlins/thumb.gif
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Actually runs nicer and starts easier now...1/32" past the mark. I guess my timing chain isn't that sloppy. /forums/images/graemlins/smile.gif

    Rene
     
  6. BlueBlazer

    BlueBlazer 1/2 ton status

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    Cool deal man, should help your motor last a lot longer now too. Have fun in Moab.
     

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