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    88 115hp L6 fuel pump vacuum powered only?

    Ok that's good to know. So the hole in the crack case is supposed to be open, I didn't lose a part there, right?
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    88 115hp L6 fuel pump vacuum powered only?

    Thanks to all engine mechanics for the time you have taken for responses on this forum, you're a wealth of info. I'm rebuilding my 115hp and have a quick question that I knew you could answer. In the crank case, behind the fuel pump, is there anything that belongs in the hole behind the fuel...
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    Bow riders with best engine access?

    Sorry I should have clarified. Of the I/o powered bow riders...
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    Bow riders with best engine access?

    I'm shopping for a used bow rider, and I am typically a diy mechanic. One thing I'm interested in us having good access all around the engine compartment. Who has experience with good or bad access in there? What brand of boat do you recommend for good access? What brand has poor access?
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    Any way to change just one piston and rings on 1988 Mercury 115 L6 2 stroke?

    Sending this in case someone else might find it useful. I'll prolly try this method if I end up removing the crank shaft.
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    Any way to change just one piston and rings on 1988 Mercury 115 L6 2 stroke?

    @Chris1956 Or can I leave all rods and pistons connected to crank and not have to deal with any needle bearings except the ones for the one piston? Is the special ring compression tool for reinstall really available online? What parts should I replace in addition if I year down powerhead to this...
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    Any way to change just one piston and rings on 1988 Mercury 115 L6 2 stroke?

    What, @racerone ? Isn't this a removable head in this photo? Or just head cooling cover? :-(
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    Any way to change just one piston and rings on 1988 Mercury 115 L6 2 stroke?

    Oh crap. Thanks for that warning! Can I leave crank in place, unbolt connecting rod push the one piston out the head end and avoid removing crank?
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    Cause of this milky water

    I don't have the crank cover off just exhaust cover and powerhead off lu. Does that milky around drive shaft look like symptom of bad drive shaft seal, or should I replace upper seal on driveshaft anyway while I'm in here? Initially trying to determine if the milk is coming from powerhead or lu...
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    Any way to change just one piston and rings on 1988 Mercury 115 L6 2 stroke?

    Gotcha. I thought about reed valves, but checked and have no blowback thru carbs and engine always starts and idles ridiculously well for its age and the fact that it had one cylinder sucking water and one with reduced compression. But I'll inspect. Thank you @racerone for responding to all my...
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    Any way to change just one piston and rings on 1988 Mercury 115 L6 2 stroke?

    Labyrinth seals? What's that? Something like making sure my cylinders aren't egg shaped so the rings stay fully compressed full stroke?
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    Any way to change just one piston and rings on 1988 Mercury 115 L6 2 stroke?

    Looks like pistons for sale on this site are only 2 ring type. Mine are 3 rings. Anyone know where to find oem replacement 3 ring piston?
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    Cause of this milky water

    I am in process of replacing exhaust cover gaskets on Mercury L6 1988 to stop water in bottom cylinder problem. The powerhead came off pretty easily, but I find this at the drive shaft-see photo. Is it from the powerhead or could it be from the water pump or elsewhere? I'm guessing from the...
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    Any way to change just one piston and rings on 1988 Mercury 115 L6 2 stroke?

    So I pulled the power head and removed exhaust cover on my engine today to fix a water leak into bottom cylinder. On inspection I find the top piston is missing it's top ring entirely. That cylinder ran 100 psig on compression test and other 5 ran 120 last week before I started this project. Is...
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    Must I pull power head for exhaust cover removal?

    So I have water in cylinder number 6 the bottom cylinder in my Mercury 115 l6 Tower of Power. Water is also dripping out of the gasket joint at the bottom of the exhaust cover. So I want to pull the exhaust cover and replace all the gaskets between that and the head. My question is this: can I...
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