leaking lower unit

Discussion in 'Boat Repair Help' started by rocky357, Feb 10, 2009.

  1. rocky357

    rocky357 New Member

    Messages:
    277
    State:
    Belmont, NC
    I have a 04 Bayliner 175 with a stern driven Mercruiser 135 hp motor. I was out the other day and noticed that all my stern drive fluid was missing from the reservoir. I went in and bought some Hypoid 90 drive fluid and filled it back up. I took it out again to check and noticed a "oil slick" coming from the stern drive unit on the water. I checked the reservoir and it didn't appear to be losing fluid at idle so I ran it across the lake and back and checked it again, "around 5 to 10 mintues out and back". The reservoir was nearly empty. I didn't see any fluid at all in the bilge area so I'm assuming its leaking from the lower unit itself. My question is, would this be a seal leaking in the lower unit? If so how hard would it be to repair? I would take it down to the local marina but the last time I took it there they had the thing for 3 months replacing a stern drive unit that had been stolen. If I have to take it to the Marina any guess as to how much it would cost? I know its kind of a vague guess at this point, but I assume a marine mechanic with lots of experience on this forum might know on average what it costs to fix a leaking stern drive unit.

    Also I am afraid I ran it for a few minutes when it was almost out of fluid before I noticed it was empty and on the run back to the boat ramp. Would doing this once or twice ruin the gears? Don't want to take it some where and have someone try and sell me a new lower unit if I probably haven't damaged it by running it out of fluid for a short time.

    One last question. What exactly is Hypoid 90 drive fluid? Is it similar to 50W motor oil? I looked closely at it and it appears too thin to be similar to 90W gear lube for cars.
     
  2. rocky357

    rocky357 New Member

    Messages:
    277
    State:
    Belmont, NC
    I thought I would also ask if anyone from around the Charlotte, NC area knows a good marine mechanic?
     

  3. Fishmaster1203

    Fishmaster1203 New Member

    Messages:
    3,603
    State:
    PA
    If you have anything leaking out of the lower unit, you also have water getting in and it will damage gears and bearings. Take it to the shop.
     
  4. rocky357

    rocky357 New Member

    Messages:
    277
    State:
    Belmont, NC
    Sounds like good advice from someone with experience. I called around and found a place that's pretty close to the house. I figured better safe than sorry. I would rather pay for the seal now than the unit later.

    Checked with the dealer who kept my boat the first time for so long and they're out of business. Not surprised by that one.
     
  5. MOVINON

    MOVINON New Member

    Messages:
    364
    State:
    Glenwood Iowa
    You might consider buying what ever special tools you need to get to this seal if it is a nicer boat. Then you can change it yourself and save some money.
     
  6. jrack1

    jrack1 New Member

    Messages:
    55
    State:
    mo.