A/C Bypass belt length for 4.9
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HT4100 4.1, 4.5, 4.9 Discussion, A/C Bypass belt length for 4.9 in Cadillac Engine Technical Discussion; I am wondering if anyone can tell me the correct length (and perhaps part #) of the shorter serpentine belt ...
  1. #1
    injectedls1 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Jun 2008
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    A/C Bypass belt length for 4.9

    I am wondering if anyone can tell me the correct length (and perhaps part #) of the shorter serpentine belt needed to bypass the a/c on a pre-northstar 92 STS 4.9L.

    I have searched all morning and I came up with conflicting lengths and part numbers:

    62 inch
    -Duralast 620K6
    -Dayco 6PK1575
    -Gates 68411

    74 inch
    -AC/DELCO 6K739
    -Micro V 6PK1888

    Also, is it smarter to simply run the shorter belt, or go ahead and buy the bypass pulley (http://autoparts.pricegrabber.com/cooling/m/73760699/)?

    If all else fails I will just use a string to measure, but I'm hoping someone has already done the grunt work.

    Thanks in advance

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  3. #2
    NickySantoro is offline Cadillac Owners Fanatic
    Automobile(s): 1993 Eldo 4.9 66K miles
    Join Date
    Nov 2005
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    Nazi Jerky, libtard central
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    Re: A/C Bypass belt length for 4.9

    This was posted by someone a while back.
    Attached Images

  4. #3
    injectedls1 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Jun 2008
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    12
    Thread Starter

    Re: A/C Bypass belt length for 4.9

    Thanks, that confirms two of the part numbers I had found! Hopefully it will still effectively spin the water pump since it is the smooth side of the belt, and the water-pump pulley is smooth.

    I will give it a try. Worst case - I'm stuck with a useless belt.

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