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    Transmission leak?

    I just rebuilt the 71c in my 99 21i. Filled it according to factory manual instructions. I went out for a water test yesterday and the boat ran like a champ, rolling starts, dead stop to on the gas, cruising no slipping, no noises. After about 10mins I started smelling transmission fluid and there was a good amount in the hull. I'd say there was at least 3/4 of a quart. It was leaking enough that the trans started slipping. However I couldn't find the leak. I checked the cooler first as I've been seeing they're prone to cracks. That was totally dry. I found some seepage out of what looks like an "inspection cover" on the top of the trans. and maybe some alone the bottom between the trans and the housing(I couldn't tell if it was leaking or that's just where it was running to). No leaks on the hoses or at their fitting. Nothing from the output shaft. This is making me thing something related to the input.

    Ilet it sit overnight to see if there would be drips this morning and the hull was totally dry and clean. So to me that shows it's only leaking when the trans has pressure.
    Any ideas?


    This was in the hhull after about 10mins. There was a little water in the hull so this is what ran to the stern. There was the majority of it under the oil pan of the motor
    20160428_160739.jpg

    There was some slow seepage from this cover. It's on the bell housing on the top of the starboard side
    20160429_091220.jpg

    The cover removed
    20160429_092659.jpg

    #2
    Could be the input shaft seal.

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      #3
      Pulled the transmission back part and found these 2 thing of interest...

      Some oil in the input seal
      20160430_150936.jpg

      And what looks like a massive leak at the bottom on the main seal of the case
      20160430_151752.jpg

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        #4
        Got it all squared away. Missed the big o-ring seal on the inside of the pump housing. All good to go, water test went great

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          #5
          My main gearbox oil is starting to leak also. I've had to add about 1/4 Q ATF each time we've taken it out on the water. What parts should I check first before freaking out on a 2016 Z?

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