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    Water Kickback After Prop Change

    I would think a 19P prop would be pretty close. I ran a 21P prop on my 16 footer with a 1500 Tower. The vast majority of the Towers are longshaft (20"). Your transom needs to match. I doubt you will need a whale tail with that much power. With trim she should cruise at 50MPH, if your...
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    Type of sealant to use

    Gee, what about clear silicone caulk. It is used on my Anderson windows, and lasts decades or longer. It is less than $10 / tube.
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    anyone use fishing line?

    I would recommend upholstery thread or carpet thread. Carpet thread is too heavy for my current machine, but it is stronger. Neither will rot quickly, and should last the life of your repair. Both are avail wherever thread is sold (walmart, Joanne's...).
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    Simple

    On Merc sidebowl carbs, the idle restrictor tube can be cleaned by pulling the brass plug on the upper port side of the carb body. If the main jet plug is also removed, the gum out can possibly flush it out, along with the main jet. the idle mixture screw allows you access to clean the air...
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    Boggs down

    I could not think of anything that would cause drag in the gearcase only in forward gear. In neutral all gears are turning. In fwd or reverse, all bearings and gears are turning. Nothing normally different about fwd. But why not try a test? Remove all spark plugs. Put her in forward and...
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    1988 35hp - Multiple issues

    The crankshaft has some seals that are supposed to keep water out (that likely failed) and will keep penetrating oil out as well. You might take a pick and see if you can tear them.
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    Boggs down

    OK, more obscure issue, I would think. Time for some SWAGs. Observe the shift linkage as you shift into forward. Does the shift arm rub any electricals? Does it pinch off a fuel line, or a vacuum line to the fuel pump?
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    Trim position sensor

    If you replaced the trim limits and trim senders and it doesn't work, suspect the wiring. Both sender and limit were open to the water, which doesn't help. IMO, the wiring had every chance to be pinched by the outdrive, and needed to pass thru the outdrive hull fitting to reach the dashboard...
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    bypass vapor pump assembly

    Another thought. I believe the crankcase vacuum/pulse used to drive the VRO pump goes thru a pulse limiter. You might want to replace that with a thru fitting to give more vacuum/pulse to the new fuel pump. I would research the fitting on other motors that use your new fuel pump, and see...
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    Boggs down

    Are you running the same RPM in forward, neutral and reverse, or is RPM in forward higher?
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    bypass vapor pump assembly

    I agree with Crosbyman. It may work, however, a working vapor pump does provide some pumping action that aids the VRO pump. The question is whether your new straight fuel pump needs that assistance? If I were you, my S-I-L would be out of the will.
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    Grinding going into gear

    With the prop off, the only shift load is the propshaft. You will hear a short clunk or loud click when shifting if the gearcase is good. RPM would not matter much for that test. Of course with the mass of the prop, the noise will increase as RPM rises. A video with sound might help. BTW a...
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    Trim position sensor

    Trim gauges are overrated. They react slowly to trim, and only give a rough approximate of the trim angle, which changes as the sender corrodes. It is best to trim by sound and the feel of the steering. You will hear the trim motor sound different at full down and full up. All other trim...
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    1988 35hp - Multiple issues

    Was that motor submerged, perhaps? I am not sure how the driveshaft and crank will turn 1/2 way, and the flywheel won't budge. Rusted top bearing and broken crank would seem to be a possibility.
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    1976 Mercury 1150 Lower Unit Compatibility

    I would think the '78-79 1400 will fit as they are simply a rebadged 1500s. I would expect the gearcases from all the 80's inline 6's to fit, however, I did not try those.
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    Murcury 850 thunderbolt ignition tachometer

    OK, if you have an automotive style tach, it may work just fine with the pulses from the switchbox, as you have it wired now. No way to know, but try it. Let her idle and see if you believe the reading. if the motor is tuned correctly, you motor should idle at 850-1000RPM on the flusher. The...
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    1976 Mercury 1150 Lower Unit Compatibility

    The 1500 will fit, as will the inline 4 cylinders (800, 850) from most of the 70's. The IL4 motors have a lower (2.3::1) gear ratio, than your 1150 (2::1). Obviously the 1150's will fit from the 70's as well. Not sure about the 125HP models, as that was either older or much newer. Where are...
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    Need advise on old Mercury

    That is correct according to the maxrules model year guide.
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    2000 Mercury 175 efi Water pump issues.

    A lot of those Merc V6 motors do not run water out the telltale until the thermostats open. On a cool day with cool water at idle the motor may not get warm. If water is coming out the gratings above the antiventilation plate the motor is pumping water.
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    1988 35hp - Multiple issues

    If you peer into the gap, you should see the waterpump housing, as it sticks up from the gearcase a bit. The driveshaft is in the center of the waterpump housing. The penetrating oil must run down the waterpump housing over the slinger, onto the driveshaft and then down the driveshaft into the...
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