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#298043
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    The driveshaft seal Mercury Part Number is 26-21670 which crosses to 4990 commercial code
    The seal pressed into water pump cartridge is 26-22058 which crosses to 4923 commercia number
    The square O ring is Part Number 12-22776 for which I have no cross to commercial number. It may or may not be
    a special or no longer current
    I have some used parts and even a couple NOS water pump
    cartridges.
    Rule of thumb is direct drive
    motors use grease and shift motrs use oil… with exceptions. I have been told
    that some will use grease instead of oil if shaft seals
    are worn out or if shaft is rusted or groove and even a new seal will soon
    or water.
    I have a KF3 gear case assembly job sitting on bench,
    Need to press the $$$ needle bearing out of damaged case and press the into a KF5 case
    (same except water intake slits) Changinng cases cases may mean shim swaping to adjust gear lash,
    I have been sitting on this for some time. Last of old style powerhead mated to first
    of the fulley jeweled lower
    units. A $50 bargain that was
    completely worn out.
    Louis