4.6 dohc rebuild

Discussion in '96-04 - 4V Specific' started by Phoenix0783, Oct 6, 2014.

  1. Phoenix0783

    Phoenix0783 New Member

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    The motor in my '97 Cobra is getting a little tired so when I found a complete engine for $350 with "a rod knock" I bought it to rebuild

    Already removed intake, valve covers, harnesses, and accessories
    [​IMG]

    Making progress
    [​IMG]

    Not bad
    [​IMG]

    Still not bad
    [​IMG]

    Good cross hatch still
    [​IMG]

    Heads were a little oily but OK.
    [​IMG]

    About 5 hours to get this far.
    [​IMG]

    Fingers crossed
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    Doh! #2 rod bearing
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    #1 main bearing
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    #5 main bearing
    [​IMG]

    Other half of #5 main bearing
    [​IMG]

    #2 rod journal
    [​IMG]
     
  2. 96blak54

    96blak54 Legend

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    That cranks toast! Good thing you knew! What did the engine come from and what year?
     
  3. Phoenix0783

    Phoenix0783 New Member

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    '97 Cobra. I'm worried about the main bearing saddles in the block now, but I think they're fine.
     
  4. D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    Line hone for shits and giggles or just gonna run it?
     
  5. MustangChris

    MustangChris Legend Retired Staff SN95 Supporter

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    hm. looks fine to me. Just put it back together and use synthetic next time.





    [/sarcasm]
     
  6. KillNThrill24

    KillNThrill24 Legend

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    I <3 4v
    I hate tearing apart 4v. Takes all day. Sounds like you've found your problem tho. Nice work tearing down
     
  7. D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    how did the cam jounrals look?
     
  8. Phoenix0783

    Phoenix0783 New Member

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    Haven't looked at them yet. Probably should soon though.
     
  9. D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    This just goes to show you can never have too much oil in a 4v...... the pumps are the greatest but they suck the sup dry pretty often.... the only cobra motor I disassembled that had great rod and main bearings and journals threw a rod and did some minor damage to a sleeve
     
  10. 96blak54

    96blak54 Legend

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    Ive literally had arguments with known modular forum guys about how easy the pump can suck the pan dry at high rpms. Im glad to see others know this as well. The pan is efficient enough but between gravity return and windage catching the return the pump will dry suck.
     
  11. D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    I want to look into porting the drain passages a little but I'm lazy a 7qt oil pan is a cheap band aid
     
  12. 96blak54

    96blak54 Legend

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    And about the only too
     
  13. D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    Shm and MHS have both discussed options... MHS web page about it is confusing as hell
     
  14. Phoenix0783

    Phoenix0783 New Member

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    MHS?
     
  15. 96blak54

    96blak54 Legend

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    Masterbate Hand Soap?
     
  16. 96blak54

    96blak54 Legend

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    SeanHylandMotorsports and ModularHeadSports
     
  17. D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    So we are kinda taking over your thread .... kinda seems pretty common lately.... I think [MENTION=14727]96blak54[/MENTION] is following me.... or I'm following him
     
  18. Phoenix0783

    Phoenix0783 New Member

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    Haha. No worries. I didn't know the stuff about the oil pump sucking the pan dry, so that's good to know.
     
  19. 96blak54

    96blak54 Legend

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    Lets assume the heads are fine. The block rebuild is going to cost more than what another junkyard score will. Let this block sit and start looking for another shortblock, but be sure to hear the run, rev it up, etc..
     
  20. D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    Of you can inspect the oil pan look for shavings