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    Plugs plugs and wires

    Technically 250 Cu in does convert to 4.0L, However, make sure you get parts for the inline 6 that you have, for the year you have. Ignition systems changed greatly over the years, so you need the correct year and engine. I would expect it to be known by the original designation i.e. 250 cu...
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    '93 controls

    Look for a slot on the base of the handle. To remove the handle on a lot of those shifters, you need to turn them until you expose a set screw, visible thru the slot on the base of the handle. My OMC handle needs to be full reverse to expose the set screw. Other controls have a pop out...
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    Plugs plugs and wires

    Generally Mercruisers use their own ignition systems in their marinized auto engines. However, in that old of a motor, anything is possible. There are lots of web stores where you can look up and buy the correct parts. It is likely that iBoats is one of them. ebasicpower is another...
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    Hull support trestle

    Take a ride to any marina that stores boats on land. You will see stands like you have used, as well as cement blocks. Notice where they place the blocks on multiple types and sizes of boats. I cannot comment on stands as I have never used them. Never support the boat on a jack, and crawl...
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    Hull support trestle

    Gee, easy stuff. lower tongue of trailer as much as possible. Put stacks of cement blocks under each transom corner. Top them with wood so that they touch hull. You want at least 12"X4" wood contact area with hull, including right under transom. use double blocks on first and second course...
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    New to wiring - question about boat controls

    Generally, on an outboard, engine wiring runs directly from engine to controls. Power and tach signal are provided (usually purple wire and grey wire respectively), to dashboard for gauges only. The battery cable from the motor is connected to the battery switches, and then to the batteries...
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    1984 Mercury V-6 150HP Poppet Valve

    I believe the poppit valve, when open at 2000RPM or so, dumps water into the engine to cool it. The thermostats are therefore bypassed when the poppit opens. I do know that the poppit valve design has changed over the years. You might get original parts for yours to assure it works correctly.
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    Hull support trestle

    What kind, length of boat? Normally boats are blocked up at the transom corners, and under the bow keel. Cement blocks with wood on their tops works real well.
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    Best Method for loosening stuck bolts.

    It is never good to break a bolt. Mostly because they usually break at the first thread, which is usually flush with the block. Then you are drilling a SS or Steel bolt, in an aluminum casting. That is very difficult to do well. Take your time, use lots of penetrating oil and heat and say a...
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    electric outboard, 350 Hp

    Really, 60MPH on a tritoon? include me out of that test drive. Some years ago, there was an inboard ski boat with electric propulsion. You could ski for an hour and then recharge overnight. I doubt current solar panels can recharge that 350HP electric motor batteries, in any reasonable time...
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    Best Method for loosening stuck bolts.

    Heat is good. I have heated bolts and then sprayed them with a penetrating oil. As they cool, they tend to suck some of it into the bolt passage. It is good to heat the block to help it to expand and loosen from the bolt shaft. Also, use a 6 point socket or box wrench and loosen them just a...
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    electric outboard, 350 Hp

    Sure, take that electric OB out into the ocean, and let the weather blow up, where it takes 3X the expected time to get home......
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    Query about raising outboard 6" on transom

    OK, The zinc anode is clean and bare? You could add more anodes. There are ones that screw onto transom bolts, and other universal ones as well. Alternatively, maybe there is stray current in the water? Do you moor in a marina with boats with shore power? Do you have shore power? Leakage...
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    84 Merc 115 I6 rectifier

    OK, not sure what to say. Rectifiers usually do not break if they are connected properly. You can check them with an ohmmeter. Search for the procedure to test a bridge rectifier. You check each of the 4 diodes for continuity one way (on the meter), and no continuity the other way.
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    Query about raising outboard 6" on transom

    The aluminum of the PTT unit should not get eaten away when moored in saltwater. You should have a zinc anode on the motor, usually under the PTT unit. You are not using copper-based antifouling paint on the motor, right? If that blue paint on the gearcase is copper based, it will eat away...
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    84 Merc 115 I6 rectifier

    Rectifiers will blow if they are disconnected from ground or the battery, and the engine is running and the stator is putting out battery charging voltage.
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    1993 Mariner 75 hp lower pivot shaft seal replacement

    The term seal is used loosely, in this application. There is a bushing, that is plastic and needs grease. You need to keep pumping grease into the swivel shaft to keep her from rusting up, as the '93 motors had steel (not stainless) swivel shafts. That was changed in the newer models. Not...
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    1988 Mercury outboard won’t trim up or down

    Some of those replacement PTT motors have an adaptor that allows the motor shaft to drive the pump. If that is not installed, the motor just spins. The motor should not stick into it's mounts. You likely need to remove it and see if it truly drives the pump. I normally needed to remove the...
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    Fuel leak/ affecting plug?

    It is very difficult to understand your question, at least for me. It seems obvious that fuel from the tank leaked into the bilge of the boat. The source of the leak must be found and fixed. Replacement gaskets for the gauge senders are available. You may also need to buy or make a gasket...
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    Key switch / Ignition issue

    If you have the slave solenoid, you can jumper it and see if the starter turns. You will want to find the battery power on the secondary winding, and connect that to the primary post that would receive power from the ignition switch. Jumpering across the slave solenoid secondary winding proves...
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