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    80's 150HP black max problem (won't run when shifted)

    Water can get into the cylinders from the exhaust water jacket, and the compression can be just fine. It may be able to get into the cylinders from other places including block cracks, but I am not too familiar with the Merc V6 engines. The exhaust covers on my merc IL 6 engines leaked and...
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    80's 150HP black max problem (won't run when shifted)

    Gee, White smoke is usually steam. If water is getting into the cylinders, usually the spark plugs look brand new, as they tend to get steam cleaned. You can remove the spark plugs and crank the motor in a tub of water. Now hold a rag over each spark plug hole and look for droplets on the...
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    Water in the Lower Unit

    Jimmbo, You are correct. However, after you fill the gearcase, you remove the pump or tube and some gear oil spills out, giving some airspace. Also, when filling the gearcase, there are always a few bubbles that will pop, giving added airspace. There is not (IMO) enough airspace to allow...
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    Water tank heating

    What is the difference between the average solar power output in watts, and the power consumption of the water heater? If they are close, you can work something out. if the heater takes several times the average solar panel output, it will be hard to do.
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    Water in the Lower Unit

    Ideally all of the air is out of the gearcase, after you fill and seal it. Sweating would be non-existent.
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    Water in the Lower Unit

    Gee, I would perform the pressure test. My inline 4/6 engines had the driveshaft seal fail most often. However, the newer V6 Merc has had two failed shift shaft seals, and the driveshaft seal has been fine.
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    1980'ish black max 150 losing all power after running for 30 minutes

    Larger motors like your V6 can benefit from a direct fuel line connection to the fuel pump. Those quick disconnects can restrict fuel flow or allow air into the fuel line. I recommend you get a 3/8" brass hose barb to hose barb and install it with two clamps, replacing the quick connect. You...
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    1980'ish black max 150 losing all power after running for 30 minutes

    Loses power when you turn? Sounds electrical. What shape is the wiring in? Are there any wires rubbing on metal, when you turn?
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    My boat needs to run real good on the 4th of July. FIX IT !!

    Gee, I have the Atlantic ocean. Of course, sometimes the Atlantic Ocean tries to have me.
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    My boat needs to run real good on the 4th of July. FIX IT !!

    So, Memorial Day, 4th July and Labor day? Good advice, but sad. We had some folks capsize their 21 footer on 4 July, some years ago, in the bay. The night was calm, and the capsize caused some drownings. IMO, it is real hard to capsize a 21 footer in the bay. I will guess that all the...
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    1972 mercruiser water issue

    Merc water impellers do not pump well at low speed, but work OK at higher speeds, say above idle, if the bottom is chewed out. The water pump base can melt as well. Also, If an Alpha OD is in salt water, barnacles can build up in the water intakes under the impeller. I would check the bottom...
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    Is this the idle jet? Or?

    Yes, The OEM fuel strainer came with an oring and washer-style rubber seal. It was hard to get them to seal air from entering. I bought a replacement, and it just had one seal and it seems to work. When air was leaking into the gasoline line, you should have seen the trail of smoke I made...
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    Is this the idle jet? Or?

    The VRO pump will over oil if air is getting into the gasoline supply. You will see all kinds of smoke behind the boat. Check/replace the seals on the main fuel strainer, under the airbox, as well as any other places air could get into the gasoline line.. Your VRO pump is likely just fine.
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    Water in the Lower Unit

    Use the gear oil fitting on a bicycle pump to pressure test the gearcase. I would suspect the shiftshaft seal.
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    2018 60HP Mercury outboard - lower end

    The shift shaft has failed on my motors A pressure test might uncover it.
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    1979 Mercury 80 HP Tach issues

    It could be.
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    1979 Mercury 80 HP Tach issues

    Mercury tachometers need +12VDC, ground and stator pulses to operate. Normally a MerControl will offer these via plug on the MerControl or via pigtails on the newer Mercury controls. The stator pulse is on either of the yellow wires that go to the rectifier. One of these should connect to a...
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    2018 60HP Mercury outboard - lower end

    Gearcases have tight tolerances. These are set using shims behind the bearings. Some need special tools to make it correct, and if incorrect, the gears wear out quickly. Gearcases are also often hard to disassemble. Check out Sterndriveengineering.com (SEI.com) for a new replacement gearcase...
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    Bilge Pump -Auto or???

    After 21 years, it most likely has been replaced at least once. Is it still an OEM model?
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    2018 60HP Mercury outboard - lower end

    Water in the gear oil will cause wear on the bearings. This will only show up when the motor is operating. This can lead to a wobble on the driveshaft or propshaft, which allows water to get past the seals.
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