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    How to measure a Lower Unit Drive Shaft?

    Thanks for the links! Wife says I need a few more tools!! LOL! I have a couple seals coming for the water pump base, was waiting to get everything in hand before checking the gear box. I hope to have everything early this week and will go from there. I'm thankful we live on freshwater, not as...
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    How to measure a Lower Unit Drive Shaft?

    This actually happened last spring. I think the prop just picked up a submerged branch and hammered it into the plate, breaking it off. Luckily I was just idling slow when I felt it pop. I checked the prop and everything else and all seems to be fine. We actually used the boat all last summer...
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    How to measure a Lower Unit Drive Shaft?

    Naw, I still have the unit at the house, probably wait till the end of season to do a repair now. It is still usable as is and all the internal mechanics seem to be working fine boat still gets on a plane fine and I haven't noticed any major increase in cavitation. It is just a section out the...
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    How to measure a Lower Unit Drive Shaft?

    The lower unit is still assembled, just removed from the midsection & power block, so I don't have the exact "end to end" length. What I do have is the measurement from the stop collar on the shaft right above the upper case bearing, which is about the same as the measurement from the water...
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    How to measure a Lower Unit Drive Shaft?

    There are no letters in my S/N, "5489172" is it. Per the Mercury Marine online parts catalog, it would appear to fall in the "4301235 Thru 0C100560" serial number range for 175HP Carbed Outboards.
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    How to measure a Lower Unit Drive Shaft?

    I have the Outboard S/N, and have been able to determine it is either a L (Long) or XL (Extra Long) per the online Mercury Marine parts catalog. It is a ~1980 model (S/N 5489172) outboard but there are no visible numbers stamped on the upper end of the driveshaft, (above the stop collar at the...
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    How to measure a Lower Unit Drive Shaft?

    Yes they may vary if the shaft length is different between units to begin with, (short vs long vs XL). "But" when some one seeking a direct replacement for their lower unit, (power block and midsection remaining the same), and the lower unit is removed and the exposed shaft is measured from the...
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    How to measure a Lower Unit Drive Shaft?

    I was commenting in terms of finding a suitable lower unit replacement, not in determining the correct overall foot length of a complete outboard to be installed on a boat based on a given boat/transom height. When someone is "replacing" just the lower unit, the dimension from the flat mating...
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    How to measure a Lower Unit Drive Shaft?

    I have since swapped some messages with a vendor in FL who sells lower units. He instructed me to measure from the lower unit casing, flat mating surface (the surface which mates to the mid section), to the top of the splined shaft. From those points mine measures ~23 1/4" (not including the...
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    How to measure a Lower Unit Drive Shaft?

    I have a ~1980 Mercury 175HP V6 with the lower currently removed, (but lower unit is still assembled). Last year the prop caught a submerged limb and it broke a section of the cavitation plate off. I am trying to determine the drive shaft length so I can purchase a spare lower unit while my OEM...
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