• Engine and Drive Repair Topics

    by Published on 12-05-2011 07:34 PM
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    Winter Checklist

    • Stabilize fuel, then fill fuel tank. A full tank prevents water
      condensation from getting in tank and causing corrosion. Draining fuel
      does not prevent varnish formation in engines as fuel is left behind in the
      fuel system. Run engine for a few minutes to get treated gas throughout system.
    by Published on 10-02-2011 02:36 PM
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    A question we are often asked is "which is better… OEM or Aftermarket parts?"

    When you take your boat to the dealership's service department for repairs you're probably getting Original Equipment Manufacturer (OEM) engine parts. However, if you take your boat to an independent shop, you'll most likely get aftermarket parts. Is there anything wrong with that? Does a less expensive part mean ...
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    Reversible Tilt Trim Motors

    Today’s tilt-trim motors use wire wound or permanent magnet fields. Before you can accurately test the motor you must know what type it is.

    Wire wound field motors will normally have three wires and will usually have four screws placed around the
    perimeter of the motor case. If the motor has only two wires; it is usually a permanent magnet field motor.
    However, some older Mercury Marine wire wound field ...
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    Water intrusion is the #1 cause of starter failure. If water gets pumped into the motor portion of the starter from the flywheel, it will not drain out. Rust and corrosion will destroy the inside components of the starter.

    The #2 cause of starter failure ...
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    The battery is the heart of the electrical system. Always start troubleshooting at the battery. Never store a battery in a discharged state. Never add anything except distilled water to a battery.

    A good battery can provide four or five years of worry-free service with the right kind of care. Bigger is better! The battery you are replacing does not have to be the same size as the original. It is always better to have extra battery capacity. ...
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    For every 23 AMPS of alternator output about one horsepower is required.
    FOR EXAMPLE: A 12 volt,115 AMP alternator requires 5 horsepower.
    (115 divided by 23 = 5 horsepower). A 24 volt unit requires twice the horsepower.

    Alternators are designed to supply current for the accessory load and maintain the charge of the ...
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    Safety Modifications

    Electrical systems[3]
    • Marine starter motor — it has an internal screen to minimize the egression of spark movements.
    • Marine alternator differs from an automobile alternator — it has an internal screen to minimize the egression

  • Recent Forum Posts


    Re: 8Ercob jumps around above idle

    130 & 135#. It has never been run without oil. A plug wire prong must have lost contact.
    I started it and it bucked for a couple of minutes

    ba_50 Today, 05:11 PM Go to last post

    Re: 98 115 mercury

    It's a 2+2 motor, at 1800 rpm the bottom cylinders kick in motor was designed to run this way to save gas so no idle screw adjustment is on the bottom

    johnson110 Today, 04:46 PM Go to last post

    98 115 mercury

    does all 4 of the carbs have and air mix screw my top 2 do but the bottom 2 do not noticed while i was cleaning them

    ricky723 Today, 04:15 PM Go to last post

    Re: 1972 OMC 155 questions - throttle connection?

    A DualJet was created in the early/mid 80's to try to satisfy the EPA...as far as I know of, it was never used in a marine application - I think you would

    makomark Today, 03:48 PM Go to last post

    Re: Outdrive Problem?

    Looks like I may have 2 problems?

    The outdrive oil looks clean, fresh and full. BUT when I checked the linkage she wasn't firmly clicking

    jeffnick Today, 02:52 PM Go to last post