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Identifying an injection pump..

Discussion in '6.9L IH & 7.3L IDI Diesels' started by Fredrickson, Jun 30, 2020.

  1. 79jasper

    79jasper Chickenhawk

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    Everything I've found (I never go off wiki) has said they were under DD name. Which at the time was a subdivision of gm.
    So then the question remains: designed by gm, built by dd? Or designed by dd, built by gm?

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  2. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    I prefer to think that they were designed by GM, built by DD. That would explain the timing chain, hex shaft oil pump drive, the "distributor" (the bottom of the vacuum pump on your pictured engine looks just like the bottom part of a distributor), the distributor drive gear on the back of the camshaft (just like a gas engine), the main/rod bearings that look like potato chips compared to the ones used in the 6.9/7.3, and several other things. Another clue is the injector lines that run over the top of the valve covers like they do on a Duramax (at least they did on the '08 that I did a little work on). I don't care what anybody says. I consider that engine to be an Isuzu with a small amount of input from GM on the initial design. Sure, GM bought out Isuzu's part so they can now claim it as theirs.
     
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  3. 79jasper

    79jasper Chickenhawk

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    I don't disagree. The duramax is in fact isuzu.
    With the 6.7, ford is the only one to have their own diesel engine. (Even though they had outside help)


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  4. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

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    That is indeed a 6.2 db2. It is basically the same pump as a 6.9 db2, both have .290 plungers and about the same size delivery valve, and both have the smaller fill ports, compared to the 6.5 ds4 Pumps and the 7.3 db2 pumps.

    I believe the gm idis were just considered a joint project between Detroit and gm engineers so they are both equally culpable;)
     
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  5. Laine D

    Laine D Full Access Member

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    I will never understand how most of the die hard 6.2 guys will lose their mind if you bring all this stuff up LOL
     
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  6. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    Just observations from looking at the two types of engines many times. Don't even get me started on the wiring harness or the installation on the 6.2/6.5.
     
  7. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    Don't the 6.2/6.5 pumps rotate the opposite direction of the 6.9/7.3 pumps for another difference?
     
  8. 79jasper

    79jasper Chickenhawk

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    Yes.

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  9. typ4

    typ4 Supporting Member Supporting Member

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    DDA has /had one of the biggest foundries for engine manufacturing, so its plausible they made many parts for the 6.2-6.5
    The engine would have been fine except the mainline cracked at stock power let alone modded levels. The late blocks used by the hummer folks are much stronger.
    Cant remember who makes them.
     
  10. 79jasper

    79jasper Chickenhawk

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    AMG/GEP.

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  11. Laine D

    Laine D Full Access Member

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    My 6.2 buddy tried to get on me about how we have air intrusion and they don’t... now his truck is hard starting in the morning And he’s got some fuel leaks lol
     
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  12. 79jasper

    79jasper Chickenhawk

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    There are less leak points. The return setup is superior, imo.
    Filter placement is wonky though. Lol

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  13. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    This weakness is one thing that I hadn't mentioned. I was told that they made the crack-prone main bearing area .070" thicker on the late 6.2 and the 6.5 blocks. I have no way to confirm this as fact. The cracking problem did seem to disappear on the blocks that had a one piece rear main seal until the turbo was added to the 6.5 (yes there was an option for a NA 6.5 but probably didn't sell well). Then for the 1997 model year, they FINALLY added piston cooling jets and introduced an even weaker spot that cracked before the traditional one did. I have no idea on the exact date for the piston cooling jet addition, but haven't seen it before the 1997 model year. 1997 was also the newest year of Chevy truck that I have done an engine swap on. There were other changes made to the outside of the engine that separated those from the earlier models. It's been long enough that I don't really remember what those were.
     
  14. Blue94

    Blue94 Registered User

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    Amen, the 6.2/6.5s were not Detroit’s Diesels. That drives my dad insane when people say that. He has been a diesel mechanic for about 56 years now, Went to DD school in Colorado after the military, retired thank goodness.
     
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