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    Mercruiser overheating

    You can use a flusher device at idle speed to test. A barrel of water is a bit better. Check the hoses out of the thermostat for hot water. If the hoses get hot, the thermostat is open and the water is being circulated.
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    Mercruiser - Stalls in Reverse

    Corrosion often gets to the part of the shift cable that needs to move to engage reverse, making it stiff. This stiffness caused the shift interrupt switch to kill the ign.
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    Mercruiser overheating

    So your new thermostat is stuck, or is it just still closed 'cause the motor is cold? Clogged exhaust manifolds and risers can cause overheat. Were those ever replaced? Also, a head gasket leak can cause the same.
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    Trim Pump Motor

    There are two different types of motors. The two wire motor works exactly as you described, with the PTT relays serving to reverse the polarity of the voltage on the PTT motor. Power is applied to one of the PTT motor wires via the relay. The other wire on the PTT motor is grounded, when the...
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    Mercury Spanner wrench for tilt and trim

    Amazon has lots of spanners for all prices. Maybe you can find one for less. I would hope you do not need a breaker bar to remove the cap.
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    Trim pump wiring acting opposite

    Gee, just switch the wires and call it a boat.
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    Trim pump wiring acting opposite

    No, the motor would need to be disassembled, and the center section turned around. A lot of those center sections can be installed either way. I suppose the factory could screw it up, but that kind of quality breakdown would be unusual.
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    Trim pump wiring acting opposite

    If the PTT motor uses a permanent magnet for the field, and someone turned it upside down, the motor may act like yours is acting. Any possibility of that?
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    Winterization

    OK, so you don't use the flusher to add the A-F. Good for you, as that doesn't work very well.
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    Good morning everyone. I have a 1973 Mercury 850.im having trouble with keeping it locked while in use.

    Maybe the plastic cam is stripped? Maybe you can wire it to stay hooked all the time, as it sounds like that would work for you.
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    Winterization

    Running antifreeze info engine via a flusher device is a fool's errand. it has very little chance of working, and very often leaves water in the block. It is better to pull the plugs, probe the drain holes to dig out the rust and debris. After the water drains out, add some antifreeze to...
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    Good morning everyone. I have a 1973 Mercury 850.im having trouble with keeping it locked while in use.

    The motor should be locked down in neutral and reverse, and not locked in forward only. There is an adjustment on the rod to position the hook. Also the locking rod rides on the plastic cam on the shift shaft. Is it worn out?
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    Unknown toggle switch

    Often boats have switches for optional items never installed. I wired my GPS and radio to the wiper switch, since I do not have wipers, nor a GPS/radio switch.
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    2 stroke winterizing?

    Fogging keeps rust out of the bearings in the crankcase. The modern motors are pretty adverse to rust, so I expect it to be a good idea to fog 'em. I never fogged my '58 Johnny, since fogging hadn't been invented. Heck that motor fell into the salt water while running at high speed, and no...
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    Major coolant leak coming from behind harmonic balancer merc I/o 3.7

    You might post this in the MerCruiser forum.
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    How to Winterize a 1989 Mercury 175hp VRO removed.

    Keep the fuel line attached. Do not run the motor out of fuel. No need to spray fogging oil into the cylinders.
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    Question on winterizing a Mercury Blackmax outboard

    Keep the fuel hooked up. Make sure the stabilized fuel gets to the carbs, by running in a barrel or flusher device. Fog the motor until she smokes. Let her drain. Refill the gear oil, grease the fittings, wash and spray the powerhead with corrosion guard stuff. D/C and charge the battery...
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    Boat Loading Problem

    Get a pair of the side guides for the trailer. Put the trailer in deep enough to float on. Put a loop of line on the winch stand. After you float the boat onto the trailer, use a boat hook to grab the line and cleat it to the bow. Now get out of the boat and attach the winch strap, winch her...
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    1990 Mercruiser 4.3 Same As???

    Circulating pump is marine, it has brass impeller and SS back plate and bolts. Distributor holds MerCruiser ign components. It may be unique to MerCruiser. Head gaskets and exhaust manifold gaskets may be marine as well. Are crankshaft bearings 4 bolt?
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    johnson 60 hp key

    A lot of OEMs have only a few keys for all the ignition locks. Merc, for example, has about 10 different keys. If you have a parts place for your motor nearby, they may be able to try a few keys until they find one that works.
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