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    Power Trim issue

    Sounds like the trim rods have air in them. I am not sure why that would happen, when the tilt cylinder seems full of oil. The tilt cylinder gets it's oil via passages drilled in the stainless steel pin on the very bottom of the PT unit that the trim cylinder pivots on, So one would think...
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    Spray Epoxy?.

    The problem with spraying polyester or epoxy resin is getting it to penetrate the cloth weave. You can spray it with the right spray gun and tip, but you will still need to roll or use a brush to work it into the cloth. It would be better to brush and roll the resin first, sand it smooth and...
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    Mercury M-800 Thunderbolt Full Throttle Only Now Help

    Nah, I just had a '77 Merc 1500 and a '73 Merc 850, and now have a '93 Merc 135V6. I do all my own work. The 1500 and 850 share carbs with your engine, and the '93 shares ign systems with small differences, with your motor.
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    Merc Alpha4 no longer available. What to replace it with?

    Turning point makes a 4 blade aluminum prop. It has 2 pairs of slightly different blades designed for for speed and power, respectively. I have one on my 21 footer w/150 HP Johnny. I like it much more than the TP Hustler I replaced with it, although I do not have the stats to back it up...
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    Painting boat

    Didn't you need to prime the aluminum?
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    Stuck lower unit

    There should be a roll pin on the top of the shift rod, under the carbs. Not sure how one could drive it out, to free the upper shift rod, but that is better than pulling the shift cam out of the gearbox.
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    Power Trim issue

    When I say tilt tube, I refer to the threaded pipe that the transom clamp that the steering cable goes thru. There are grease fittings that need some grease, for tilt to move freely.
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    Mercury M-800 Thunderbolt Full Throttle Only Now Help

    Steve, To check the idle pickup timing, simply remove prop and spark plugs as described. Now advance throttle handle in boat (likely motor needs to be in gear), until carbs are ready to open but still closed. Now you can jumper starter with ign on and read timing. I expect your timing will be...
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    Stuck lower unit

    Texasmark, Merc did use mild steel driveshafts in the early 70s and before. However, that motor, if it is original gearcase will have a SS driveshaft. The shiftshaft coupler is splined to mate with the shiftshaft. One could reach under the lower carb and move the shiftshaft up/down to see if...
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    1979 Merc 2 stroke 4 cylinder 50hp

    The original MerControl would have a choke button. Newer ignition keys and controls could have push to choke. You need to choke that motor to start it, so find out what you have. To start that motor, cold start lever all the way up. Pump primer until hard. Hold choke button down(or push...
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    Power Trim issue

    Trim fluid goes into the reservoir only. Fill the reservoir, with the trim all the way up and the boat level, until it overflows. Now run the trim down all the way, and then up all the way and let her sit a few minutes for the bubbles to gather at the top of the reservoir. Refill and repeat a...
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    Wiring education

    Marine grade wiring is special, and not used everywhere it should be, likely because of cost. It is tinned, stranded, wiring, but the strands are thinner and more numerous for a given gauge wire, versus non-marine grade wire. The insulation is likely heavier as well. The tinned strands allow...
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    Painting boat

    The "Roll and tip" method of painting gives a near sprayed look and is real easy. Home Despot has a oil based alkyd marine paint by Rustolium. I have not tried it, but it looks to be heavy duty. I'll bet it would roll and tip real well, and it is $15/qt, versus $40/qt for Brightside marine...
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    Battery replacement?

    Gee, check prices at wallyworld and autozone. here in NJ, Wallyworld is 40% cheaper, at least.
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    Mercury M-800 Thunderbolt Full Throttle Only Now Help

    Those Seloc manuals can have some real bad errors in them. Since that motor is so old, not many mechanics will work on them. You might look around for a factory service manual. The timing procedure I provided should get around any errors in the Seloc, at least for link and synch.
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    This might seem like a dumb question ... But!

    You should only be able to blow thru the pump one way. That would be the direction the fuel travels.
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    1969 Mercury 1100ss tilt/trim

    The trim cylinders on my '77 Merc IL6 were sealed with orings. The piston was sealed with a teflon seal, which required a special tool to install. If she is leaking around the trim rod, you might go on crowleymarine and see if they have an exploded diagram of the trim cylinders. Those...
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    Battery replacement?

    Batteries normally last 5-6 years, in my experience. I would think you will want two 27 series starting/deep cycle combo batteries, or maybe one deep cycle battery and one starting battery. What do you have now?
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    Impeller kit for Merc 1992 135hp blackmax

    The impeller, wearplate and several gasket kits fit many models. You can usually just grab a mercury V6 kit from a dealer or marine store and it will fit. What does crowleymarine say?
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    Stuck lower unit

    Seized spline can and does happen. See if the shift rod is willing to separate, as that can contribute. People use wooden wedges to help it separate. I would expect hanging it upside down 1 inch off the floor and spraying the driveshaft with penetrating oil would help. After it separates...
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