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    troubleshoot Tachometer

    Most tachometers will "zero", when power is applied, engine off. If yours used to do this, and doesn't now, check the + (purple wire) and - (black wire) for proper voltage. If the voltage is good, it is likely the tach is bad. You should use an ohmmeter to test the signal wire to the engine...
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    Leak from garboard plug

    If your plug is leaking, you can tighten it, with a simple swim. They are tapered, so a tightening job should stop plug leak. For the fitting leak, Westmarine used to sell a caulk that could be used underwater. I bought some, but never tried it. You would need to smear it over the leaking...
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    Boat Swamped in Storm - Next steps?

    When the batteries fail, replace them. They are probably OK for now, as you are supposed to put fresh water in them occasionally. Hopefully the vents are small and kept the acid in.
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    1993 Johnson 115hp prop for sking

    Stone knives and bearskins.
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    1993 Johnson 115hp prop for sking

    You will want to pull him Slalom at 36MPH. Obviously the prop with the most power for skiing will run 36MPH in the center of the max RPM range. What is your max RPM and top speed now, when not pulling a skier
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    Mercury 850 took the leg off 1976 thunder bolt

    Gee, we had 100*F here yesterday. I don't like either of those temps...
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    Near new old 1996 Mercury 115

    Gee, there must have been 2 suckers born that minute.
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    Broken Rod End

    I have never seen that much corrosion, even in salt water. Did he ever hose her off after use? I would replace the whole system, helm to motor.
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    Boat Swamped in Storm - Next steps?

    Freshwater is not usually a problem. Get the motor running and let her idle for 45 minutes to dry her out. Let the rest of the boat drain and dry out. Electronics like depth finders and radios may have been damaged, but the engine and boat wiring harnesses should be fine. I expect the...
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    1993 Johnson 115hp prop for sking

    A few questions... How big/heavy is the boat? What pitch prop do you have? How big is the kid? Slalom skiers can easily fight the boat, especially if he has both feet in the bindings. Does the kid know to tuck the ski under his butt and get up dragging his other foot behind him?
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    possible warning noise

    You might post this in the MerCruiser forum. My '88 MerCtruiser had an oil pressure sensor which alarmed if key was on and motor not running. What you have described is not normal.
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    Small prop to avoid damage?

    A stainless steel prop will take all kinds of punishment from sand and silt, and love it. Not for use in rocks of any size.
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    Question About Anchoring Closed Bow Boat

    They have guide rollers that are mounted on the bow. They hold the anchor when not in use. You can run the anchor line back to the drivers position and cleat it there. When you want to anchor, uncleat the line and let the anchor drop from the guide rollers. Cleat it when sufficient scope of...
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    Mercury 850 took the leg off 1976 thunder bolt

    Be advised that the upper shift rod is not held down. It can rise up in the midsection, as it bumps into the lower shift rod. Look under the carbs in the front to see this. Also, you may need to "bump" the throttle handle a bit to line up the shift shafts. The shift cables are often a bit...
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    Mercury 850 took the leg off 1976 thunder bolt

    The upper and lower shift shafts can easily not line up. On those older motors there is a plastic fitting that holds the upper shift shaft in place. They often fall into the gearcase, around the lower shift shaft. Put it back into the midsection and it will help hold the upper shift. A...
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    Fuel Tank Contamination (for your information)

    Contaminated fuel is not the end all. If the fuel level gauge is accessible, remove it and tilt the trailer tongue all the way up. This puts the fuel in the rear part of the fuel tank. Now siphon it all out and either filter it or dispose of it.
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    JUST CHANGED THE STARTER AND SOLENOID.

    You will want to use a Johnnyrude solenoid. Automotive solenoids have an annoying habit of sparking, when energized. Not good under the hood of an OB with gas fumes everywhere.
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    1989 Seville 19 questions

    NADA says you could have a V8. Since the power of a V8 is about 220HP, and a 4.3LV6 power is 205HP, it makes sense. 10% more power on that boat from what I had is very reasonable.
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    Crack in Hull

    That needs to be fixed from the inside, IMO. I expect you will find the fiberglass is failing around that area, for some distance. Is that directly under the ski locker? I had an '88 SeaRay Seville (same hull). There was a piece of plywood between the floor of the ski well and the keel...
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    Mercury I6 Powerhead ID

    Block part number should tell you that info. It used to be stamped (moulded?) near where crankcase and crankcase cover bolt together, on transfer cover side. Check Crowleymarine parts list for both 115 and 90HP models of that year. Block serial number should also tell, but I am not sure what...
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