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    Mercruiser 3.0 Fuel Issues

    This is a common issue of people who do not know the subtle differences in gaskets used on that mechanical fuel pump model depending on the engine that it is installed in. I believe that pump used by the GM 3.0L inline 4 cylinder is shared between several GM V6 and V8 engines that are equipped...
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    88 Johnson SPL - lower unit oil color

    No need, this is not a motor oil change. Put a jar to capture it under it with drip pan. Take out the vent and drain plug, go take a short nap or eat and then come back. I never check/drain the lower unit lube condition afterwards on the same day it is ran. It's a good way to kneejerk worry...
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    ARE 1978 JOHNSON 115 & 1982 EVINRUDE 115 PARTS INTERCHANGEABLE???

    $1500 seems a tad bit high in asking price for that motor in your area that could very well be a salt water use motor. If you see a lot of corrosion on it, negotiate the price down to $1000. A big clue will be midsection and powerhead bolt heads condition, but could also be crusties on the...
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    Transom rot

    Given the rising cost of prices for materials and labor recently that has made it even more costly to do a major fiberglass job (even if this is DIY job), one is better off to sell a trihull off as a project or for parts. Tri-hulls have terrible resale values and you'll never recover or pay off...
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    Johnson 9.9 Hard to turn over after rebuild

    Might I add, test for unusual binding with flywheel key lightly installed and put flywheel on fully without the flywheel nut BEFORE installing powerhead. Move the crankshaft in the normal rotatation gently and check for binding or wierd noises without spark plugs installed. You should be able...
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    4.3 mercruiser how to winterize with outdrive on

    Just make sure and don't forget the raw water hose that connects to the power steering cooler. Some people forget to disconnect that one on the low side of the device and water sits there and will freeze, busting that device. AllDodge, I'm sure if the OP asked this in facebook groups, you...
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    Need help 1989 100hp johnson GT100

    I recommend probing with multimeter tip into the wire into the black/yellow kill switch wire as close as you can to the wire harness red plug doing a continuity test on the kill circuit wire. Then work backwards from the red plug pin on continuity test until the continuity fails. That will...
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    How do I get Johnson 88 motor up trim switch not working

    If your Trim motor is non-functional: On the trim motor on the starboard side of the transom bracket, there should be a hole where a screwdriver slot is, this is a release valve. Clockwise is tighten, counter-clockwise is loosen. You will probably need to lift the motor up enough to allow you...
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    Need help 1989 100hp johnson GT100

    0.01 volts is certainly within the margin of error of the multimeter for no voltage. I don't think you get what I've been asking several times involving continuity test. With the multimeter doing a continuity test (NOT a voltage test) with the ignition key off, do you have continuity with...
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    2000 Johnson 200 runs reverse( fly wheel spinning backwards) HELP , ITS CURSED!!

    It is not firing correctly, avoid making assumptions. As mentioned, you need to check timing on ALL cylinder spark plugs as explained to make sure they fire at the spot painted on flywheel of that cylinder at TDC. You'll notice it clearly when timing gun does not light very close to cylinder...
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    Need help 1989 100hp johnson GT100

    Did you do the continuity test on the ignition cutoff for ground with multimeter as I suggested to check your ignition switch? You might have a bad ground and the switch isn't the issue.
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    2000 Johnson 200 runs reverse( fly wheel spinning backwards) HELP , ITS CURSED!!

    Have you checked to make sure flywheel key is not sheared or incorrect primary ignition wire to coil happening? Need to divide up the flywheel with paint pen/grease pen of each cylinder number at TDC position. Spray some fogging oil in those cylinders, drain carbs, ground ignition with plugs...
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    Need help 1989 100hp johnson GT100

    If it happens again test the kill circuit when it happens as what you did. If you're that worried about it happening again, replace with OEM and buy the aphenol connectors and tool to fix the bandaid change.
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    Need help 1989 100hp johnson GT100

    As racer said, you can remove the bypass cover and gain access to piston & rings and remove spark plugs to turn crank to get access to piston. What people do other than looking for obvious damage is take a wide thick flat head screwdriver and carfefully check that the rings have spring tension...
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    Need help 1989 100hp johnson GT100

    VRO has nothing to do with kill circuit This outboard like most (never assume) operate with ignition circuit as normally open (engine running) that connects to ground. Which means when you want to turn it off, it grounds the black/yellow wire to ground. Unplug the kill circuit connector to...
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    1989 Johnson 175 GT Rebuild Thread

    I don't think there is any crossflow flatbacks with VRO that are 175 hp. Aren't crossflow flatbacks with VRO only 150 hp?
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    Knocking 4.3 merc

    I'm going to repeat what everyone else is saying, you need a leak down tester. Or, if you have a standard air compressor adapter on your compression tester, you can remove the valve out of it and install it with about 90 PSI into the cylinder spark plug hole with the piston held at TDC. Then...
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    Running motor out of water

    OP, are you aware though that many of those OMC carbs have a main jet/orifice access screw that lets you drain the fuel out of the carb? Usually you can screw it out until a few threads are left barely holding it in, letting fuel drain without losing/dropping it. Some might be easier/harder...
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    Help with 1989Johnson GT100

    Take my advice and buy the OEM one from BRP/Envinrude. It is worth the extra expense and you can use it with the OEM eye lift bolt to pick up the entire motor or just remove/install powerhead.
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    1990 Sea Nymph SS 175 transom thickness

    Could you take some photos or descriptions of the extent of what parts had to be removed to get to the transom? I have the same year and model, but no issues with transom strength. I'd like to know how much crud would have to be disassembled in order to add a climbing ladder in the back. I'm...
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