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Thread: Engine case question 3R vs 2R

  1. 10-27-2022, 08:02 AM #1
    OCG911T
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    Engine case question 3R vs 2R

    Folks,

    I just realized I had bought a used magnesium case which has two different part numbers….. is this a problem?

    One side is a “901 101 101 3R” and the other side is “901 101 102 2R”.

    Does is matter if the “3R” and “2R” don’t match?

    My ‘71T has “3R” cast on both case halves.

    Thanks!
    Oliver
    ‘71 911T Coupe
    ‘72 Land Rover Series III 88”
    ‘08 911 C4S Coupe
    Early 911S Registry #3663
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  2. 10-27-2022, 09:19 AM #2
    gled49
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    No, crankcases we’re up dated in 1/2’s. 1R-2R, 2R-3R, 3R-4R, etc, ending at 7R-7R.
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  3. 10-27-2022, 11:26 AM #3
    preS
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    Quote Originally Posted by OCG911T View Post
    Folks,

    I just realized I had bought a used magnesium case which has two different part numbers….. is this a problem?

    One side is a “901 101 101 3R” and the other side is “901 101 102 2R”.

    Does is matter if the “3R” and “2R” don’t match?

    My ‘71T has “3R” cast on both case halves.

    Thanks!
    As long as the pairing numbers match you know at least that is how it left the factory

    Richard
    searching for engine (case) 903742
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  4. 10-28-2022, 01:38 PM #4
    davep
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    This thread will help:
    https://www.early911sregistry.org/fo...case-Revisions
    Porsche Historian, contact for Kardex & CoA-type Reports
    Addicted since 1975, ESR mbr# 2200 to 2024 03
    Researching Paint codes and Engine Build numbers
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  5. 10-28-2022, 02:44 PM #5
    OCG911T
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    Thank you all for the information! I’m happy to hear this… I thought I had a mismatch for a moment.
    Oliver
    ‘71 911T Coupe
    ‘72 Land Rover Series III 88”
    ‘08 911 C4S Coupe
    Early 911S Registry #3663
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  6. 10-28-2022, 06:58 PM #6
    mepstein
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    I have a case with the same numbers. No issue.
    A part isn't purchased until paid.

    The 9 Store LLC.
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