7.3 or 6.9

Discussion in '6.9L IH & 7.3L IDI Diesels' started by Ethan Turner, Nov 14, 2017.

  1. Ethan Turner

    Ethan Turner Registered User

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    I have an 89 f350 the date on the door tag is 09/88 the valve cover and door tag say it's a 7.3 but it's won't fit the 7.3 fuel filter only the 6.9 has the old style start relay and most confusing is the head bolts are 7/16 not 1/2 capfuls this be a Frankenstein from the factory or redneck engineering
     
  2. sjwelds

    sjwelds Full Access Member

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    Would be better to post in the main forum, instead of the tech articles.

    There should be a number stamped on the top passenger side of the engine. If it starts with 6.9 or 7.3, you have your answer.

    My guess is 6.9 based on head bolt size.

    Edit: might be on driver's side. Can't remember ATM
     
  3. Thewespaul

    Thewespaul Supporting Member Supporting Member

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    Drivers side next to the ip gear cover
     
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  4. Ethan Turner

    Ethan Turner Registered User

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    Is there any way to find out if came from the factory this way or if it's been swapped
     
  5. snicklas

    snicklas 6.0 and Loving It!! Staff Member

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    I’d say it’s been swapped. The last year for the 6.9 was 87. If you get the serial number as posted above, we can narrow down when the engine was built......
     
  6. Knuckledragger

    Knuckledragger blowing chunks

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    Not only was it swapped, someone did not want to let on that the engine was changed and used the 7.3 valve covers to hide it. Bad juju.
     
  7. SlippyRider

    SlippyRider Registered User

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    Could have just robbed anything that was in better condition from the old engine. It's likely there are a few other items on there from the old 7.3.
     
  8. Ethan Turner

    Ethan Turner Registered User

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    Only numbers I could find were on the intake manifold they are 1804357C4 RC2A
     
  9. gandalf

    gandalf Senior Member

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    The number you want is stamped on the block, very likely covered with grunge. It's to the driver's side of the IP tower, down on a flat portion of the block. It faces upward. Look for it with a rag in hand.
     
  10. Ethan Turner

    Ethan Turner Registered User

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    1805389 C2
     
  11. Ethan Turner

    Ethan Turner Registered User

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    The was on a flat spot passenger side of the ip
     
  12. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    It's on the driver's side. Right above the temperature sending unit. Just to the inside of the back of the A/C compressor.
     
  13. Ethan Turner

    Ethan Turner Registered User

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    Alright I got it now it's 6.9D U2U442169
     
  14. Macrobb

    Macrobb Full Access Member

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    6.9 engine, then.
     
  15. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    Well there you go. It's a 6.9. really, the 7/16 head bolts give it away. You can't hide those!
     

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