Mercruiser MC1

Discussion in 'Sterndrives' started by mikealston2428, Dec 17, 2015.

  1. mikealston2428
    Joined: Jul 2011
    Posts: 203
    Likes: 1, Points: 18, Legacy Rep: 10
    Location: aussie

    mikealston2428 Senior Member

    Hi all,
    I've 2 questions about a Mercruiser MC1 leg.
    Firstly after removing the leg for maintenance I refitted it to find a gear lube leak in the upper drive shaft that filled the bellow with lube.
    I replaced the oring next to the retainer nut and reinstalled the retainer nut.
    Leaving the leg off the boat to check for leaks I found that the lube is leaking from the inside between the shaft and bearings and not the outside.
    What is causing this is there a oil seal that fits up tight against the drive shaft in the bearing assembly ??

    2nd question with the leg off the boat and in gear should I be able to turn the propeller by turning the drive shaft ??
    I can't turn the drive shaft with leg in gear and am wondering if I've got something not lined up correctly or is this normal ?
    I would think it would turn easily or with it on the boat it would turn it and smash all the gears ??

  2. gonzo
    Joined: Aug 2002
    Posts: 16,779
    Likes: 1,703, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    The shaft should be able to be turned by hand, in or out of gear. The water pump has some resistance, specially if the impeller is new. There is a seal in the input shaft. Get a manual and that will show all the parts and procedures.
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