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  1. C

    Mariner 115 serial 6632846

    OK, when you drill the bottom holes, see what the condition of the shavings are. Some think you have a bad transom. The shavings will help confirm/deny that.
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    Spun prop hub: Replacement or buy new?

    It is smart to have two props, in case one fails during a boating trip. In your case, if the prop is good, have it rehubbed and buy a new modular hub prop as well. Get a spare prop hub too. You need wrenches to change the prop as well, or just go for towing insurance.
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    1971 Mercury inline 6 135 hp motor

    Squirt some 50::1 fuel into the carb throats, close the choke manually and crank her, cold start lever up. If she won't fire, suspect an ignition issue. Is the engine wiring harness good? Most are very bad by this time.
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    Mariner 115 serial 6632846

    Do you have any bolts on the lower part of the transom clamp? Normally you would have 4 bolts, spread out evenly, two in a top hole and two in a bottom hole. I see 2 bolts in the top holes of the transom clamp on the port side.
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    Starfish 12

    The year of the boat is often part of the VIN number.
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    Turning Point Express Mach 3 prop

    The entitled prop is a new stainless steel design. Anyone tried it?
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    1979 1150 thunderbolt merc drive shaft

    A 2::1 gear case ratio is standard for an IL6 motor. An 850 usually has a lower gear ratio. You can check it easy, by turning the flywheel exactly 2 full turns. See if the prop turns 1 full turn or less. I would expect 35MPH out of your boat/motor, but that is just an average.
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    Motor swap

    The mechanical throttle and shift cables should work fine, as will fuel and steering. The electrical will work if they are the same style. The older electrical had a quick disconnect plug that was on the outside of the starboard side of the motor. The newer style was an internal round plug...
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    1979 1150 thunderbolt merc drive shaft

    You should check your compression and examine the color of the spark plugs, to make sure all are firing. I would expect a bit better top speed. Are you trimming the motor up to achieve max top speed?
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    Old propeller problems

    Gee, most prop OEMs have prop calculators. Simply punch boat type, engine and outdrive type and they will suggest one of their props and hubs. So Michigan Wheel, Solas, Turning Point are good starters. V-P might be one to check out as well.
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    High Tide Fuel Tank

    Usually those compartments drain to the bilge, as it is very hard to get a watertight seal with silicone. The fuel tank itself is vented. that compartment doesn't need to be.
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    Bolster seat

    A lot of captain's chairs have built-in bolsters. You can flip them up and sit on it. Your helm seat is likely available on the web, so you could look it up and see it's features. If you do not have that, department stores such as Wallyworld have universal cushions, which may be close in size...
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    Convertible Top

    The proper term for that cover is "Navy Top". My '88 SeaRay 18 footer had one. To stow it, one would unsnap it from the windshield, and flip it back. The top cushion along the transom would flip up and the top would fit under it, concealing al but the pipe supports which ran along the gunwales.
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    1979 1150 thunderbolt merc drive shaft

    What size boat and what prop pitch are you using?
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    1988 Mercury 115 inline six fuel issue

    it is likely the carbs are set too lean to allow acceleration. Open the top carb 1/8 turn and try to accelerate. Follow with mid carb and then bottom carb, testing acceleration after each adjustment. Repeat entire sequence as necessary.
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    Missing?

    Shows as an '86 135HPV6. Likely it does not have adjustable idle jets. You will need to make sure the idle passages are real clean. As a matter of fact, make sure the carbs are completely clean and the floats are set properly.
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    Tilt/Trim Goes Up, But Not Down

    The wires on the trim/tilt push button in the throttle handle usually have a splice in them near the handle, but often behind the panel or in the control box (whichever you have). I would recommend you find this splice and clean it. You can also check the switch action with an ohmmeter...
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    LF 1986 90 HP Mercury L6 Owners Manual

    A service manual should discuss this as well....
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    LF 1986 90 HP Mercury L6 Owners Manual

    Brown is usually overheat alarm. You should see a temp sensor on the cylinder head. Maybe it is malfunctioning.
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    Missing?

    I do not see a parts listing for a 1987 mercury 135HP motor. In 1987 there was a 150HPV6 and a 115HP IL6. So what do you have?
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