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    Tilt and Trim 150hp Mercury v6

    What year is the motor? 3 cylinder PTT unit? When you say relief valve, do you mean PTT manual release?
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    Need help timing 1986 mercury 90 inline 6 adi ignition

    Your manual is wrong. Idle pickup timing of 4-6* BTDC is for the distributor ignition models. Idle pickup timing for ADI ignition is 0-9*ATDC. Max spark advance is 21*BTDC, for both. Remove prop, and spark plugs 2-6. Advance throttle until carbs are closed, but ready to open. Crank motor...
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    Buy a 5hp Mariner with a blown head gasket?

    If that motor is made by Yamaha, the bolts are likely metric. Their marking system is a bit different than SAE bolts, but you should be able to match 'em up.
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    Buy a 5hp Mariner with a blown head gasket?

    "Chase" the threads means cleaning them with a tap or die. Gently run the tap or die over the threads, using light pressure or no pressure. It should restore them to almost new by getting rid of corrosion or old sealer. The Permatex Aviation sealer is a brush able non hardening sealer. It...
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    Power trim not working just clicks.

    The bottom left picture of the armature, on the bottom, next to the brushes, there is a circuit breaker. It is usually constructed with two different metals, that expand different amounts. That causes the contact to bend when it gets hot, opening the points. Make sure it is making contact, or...
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    Buy a 5hp Mariner with a blown head gasket?

    You might chase the threads of the bolts that came out, as well as the threads in the casting. Use some Permatex aviation sealant on the bolts upon reassembly.
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    Impeller change level of difficulty Q

    Tie or anchor the boat firmly so she doesn't move while you work on it. Pull the bolts and remove the gearcase. Take the gearcase ashore where you have built a fixture to hold it. Vice works, some sort of wooden stand or even some cinder blocks with wood padding. Take your time and follow...
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    3.7 gets hot while idling

    I had that exact issue on my 4.3LX Mercruiser Alpha. The bottom of the impeller was damaged slightly so it did not pump sufficiently at idle. If your impeller is new, and you did not suck up some sand to damage it, you may have a different problem.
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    Need help with the starter

    No rubber in most bendix's.
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    Buy a 5hp Mariner with a blown head gasket?

    If you have a drill press(or want one), they are real good at drilling out bolts. Pulling the powerhead should be pretty easy, I would think.
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    Power trim not working just clicks.

    It looks like you have an overload (bi-metal circuit breaker) on that motor (picture 1/2). You might check it to see if it is open due to some rust or dirt. The rest of the motor doesn't look too bad, however, I cannot see if the armature or field is open.
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    Stator

    Try ebasicpower as well.
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    Need help with the starter

    Remove the starter gear and clean the grooves with paint thinner or some other gentle solvent. Do not use acetone, or it will melt the varnish on the windings and ruin the starter. Lube with motor oil and reinstall. Grease is usually too heavy, and causes the gear to stick.
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    Stator

    Brad, Crowleymarine shows this stator for your motor. https://www.crowleymarine.com/mercury/products/888793-stator-assy Here is the rest of the parts for your motor https://www.crowleymarine.com/force/oem-parts/outboard/1988/507y8c-force?mdl=RPLUOO You may even find it as aftermarket made by...
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    Time for my first bellow change, tips?

    Make sure you note where the clamp screws are oriented, before you take 'em off. Put the new bellows on and put the clamps exactly where they were. A glue is used on the bellows. The service manual procedure specified putting the driveshaft bellows on the transom plate and the exhaust bellows...
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    Add cleat to trailer?

    If you plan to attach a line from the bow cleat to the winch stand, it makes sense to assure the cleat can hold it. Many boats attach their cleats with simple bolts (1/4" or smaller) nuts and washers. These can pull through the fiberglass. Make sure the cleat has a backing plate and at least...
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    Tach not working

    Tachs usually have 3 connections, + and - 12VDC and a signal from the stator. They also usually zero when power is applied, engine not running. So make sure they have voltage and ground, and the connection to the stator is good. If they are, chances are the tach is bad.
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    Buy a 5hp Mariner with a blown head gasket?

    Do not break the extractors. They are hardened steel, and resist drilling.
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    Buy a 5hp Mariner with a blown head gasket?

    If you can get a vice grip on the broken bolts after you pull the head, they may come out. use some heat and then remove the heat and spray with penetrating oil and let cool. Repeat a few times. As the bolt cools they can suck in the penetrating oil, helping to loosen them. Then try the vice...
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    Info

    OK, vague question deserves vague answer. Let's assume he means ign coil. Primary should be almost a dead short. Just an .1 ohm or so. Secondary should be much higher in resistance, but not open, say 275 ohms Those specs were for my Johnson V6, but can vary with a crummy ohmmeter.
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