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    Normal water pressure

    I just completed a rebuild of my lower unit and have a strong tattletale stream. Now that I can hook up my water pressure gauge and expect to see something, what is a reasonable water pressure for a 1980 Mercury 70 outboard?
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    Likely causes of top piston failure

    I don't have a problem with my motor, 1980 Mercury 70, but I keep hearing about top piston failures, especially in inline 6 cylinder motors. What are the main culprits for this? Poor cooling? Mixture too lean? Too little oil in gas? All responses welcome.
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    repairing acrylic windshield

    I have a smoked acrylic windshield. It had a crack and I removed it and a piece broke off. It's a 1980 boat, so I don't think I can get a replacement. Thoughts on how I can repair it. Ive considered super glue (don't want the white film from the glue) or PlasticWeld.
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    My driveshaft bellows has a lot of gear oil in it!

    Removed the driveshaft housing off the transom assembly today. Heading towards replacing all the bellows. And the driveshaft bellows has a big pool of what smelled like gear oil in it. Do I need to replace the seal aft of the driveshaft? 1989 Mercruiser 5.0 LX Alpha One OC507398 Thanks!
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    Should I inspect/replace my manifold risers?

    1989 Mercruiser 5.0 LX Alpha One I have inferred from several threads on here that after 5 seasons of use, I should replace my exhaust manifold risers ( as well as gaskets), no questions asked, as preventative maintenance to preclude getting a crack in them and water in the oil etc. Is this...
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    How should my audible warning system work?

    Ok, as a follow up to a previous thread, I am now working on my audible warning system. On the engine side, I have a water temp sensor on the port side of the engine and an oil pressure sender on the aft port side of the engine, both wired to the #4 hole on the engine harness plug. On the boat...
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    My trim gauge doesnt work!

    Good morning!! 1989 Mercruiser 5.0 LX Alpha One OC507398 Having previously rebuilt my trim limit switch and got my trim system working top notch, I moved onto my trim indication system. I found the two wires coming out of the sending unit broken and frayed so I disassemble the sending...
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    Mercruiser 5.0 no holeshot/stalls

    1989 Mercruiser 5.0 LX 230 4 bbl (Rochester) Alpha One. I have taken this boat out twice since I purchased it. I replaced the fuel line from tank to fuel pump and the return hose carb to pump. Replaced the fuel filter. Checked that there is no water in the fuel tank. There was none in the old...
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    What fluids/oils should I be using?

    1989 Mercruiser 5.0 LX 4bbl with Alpha 1 outdrive. PO was using Mercruiser 25W40 oil for the engine and, I'm sure this will lead to a discussion, automotive power steering fluid, for the trim system. What are the correct fluids for: Engine oil Lower unit Trim system I live in Illinois...
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    Fuel Vent line clogged?

    The boat is an 89 Sylvan 209 with a Mercruiser 5.0LX (4bbl) and Alpha One. Just purchased the boat and it ran nice at a prebuy inspection. First time it had been run in a year and a half. Got it home, it was difficult to start, and when it ran, it ran for about a minute and then it shut down...
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    1956 Johnson FD-10 coil test

    i have a intemittent miss at idle and im believe it is an ignition problem. I have new coils but rather than jus replace the coils, is there any way to test them?
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    1980 mercury 70 no tattle tale

    I am bringing this motor to life and have rebuilt the water pump and replaced the impeller. When I plAce the muff on the lower unit, no water comes out the tattle tale. With city water @ 40 psi, shud it? PO stated he had run it in slot of silt and mud. If the power head passages are clogged, do...
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    mercury instrument wiring

    I have remotored my boat with a 1980 Mercury 70 with version A PTT (2 hydraulic hoses to each of two cylinders and a remote mounted trim pump) and it came with a remote control that I believe is not the exact correct one (with a trailering button) but I believe will work. The Mercury remote...
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    Steering cable binding

    i am in the final stages of putting a 1980 bass boat back together and the steering cable is binding. It is a single cable rack and pinion type steering cable. So I disassembled all the pieces as far as I could and I cannot find a way to get the cable itself out of the housing. Are to...
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    pitot tube installation

    I have restored the gelcoat of a tri-hull bass boat and need to install a new Mercury pitot tube on the transom. The old motor had a pitot pickup and tube on it and the new one doesnt. So I need to install this pickup. I understand I should use 4200 in the holes when I drill them, but exactly...
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    lower unit driveshaft repair

    1980 merc 70. I have rebuilt the water pump on my lower unit. There is a considerable amount of wear on the driveshaft where the bottom seal meets the driveshaft. The oil was dirty but free of water when I removed it. In the future, if there is too much wear on the driveshaft and am getting...
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    flush attachment for a pre 80s lower unit

    Where can I find one? I have the flush hole, and want to put a flush attachment on it for flushing.
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    Will this lower unit work on a 1980 Merc 70?

    In an attempt to remotor my friends rebuilt boat, we bought a 1980 Merc 70 with Power Trim. I tried to get some parts for the motor and found that the lower unit isnt exactly the right one for this motor. The lower unit that is on it has a flush plug and no place to screw in the fitting for...
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    1980 Mercury 70 Power Trim fluid selection

    I purchased a boat that has this motor and power trim (2 cylinder) system on it. most of the power trim parts are there but they were never connected or running on the boat. So I have disassebled/cleaned and rebuilt the trim pump and am going through the rest of the system. The sticker on the...
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    Is this 1988 Force 125 good?

    I have a good deal of experience with antiques (Johnson/Sea King/Tecumseh) and have helped a friend revive a 1980 Merc 40. I found a boat the other day, a 1988 Bayliner 18 with an 88 Force 125. I have inspected the hull and trailer and am confindent that I understand their condition. I looked...
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