• Engine and Drive Repair Topics

    by Published on 12-05-2011 06:34 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 01:36 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: Priming System Operation

    What is your motor doing / not doing ?----How did you determine it might be flooding ?----The electric primer is a valve that opens when key is pushed

    racerone Today, 06:31 PM Go to last post

    Re: 1968 3hp cowling seal

    The seal for the 3 HP ( only marketed in 68 ) has the same part # as most of the later 4 HP models up to at least 78 !-----These motors were essentially

    racerone Today, 06:00 PM Go to last post

    Re: 2006 Mercury 9.9 tilt stuck in up position

    I just wanted to post what I have learned from having the same exact issue as what was reported here.... Manual tilt. Motor goes up but will not relase

    OR-Mercguy Today, 05:56 PM Go to last post

    Re: 1968 3hp cowling seal

    Racerone, that's the one I was thinking would fit. Once I know for sure, I'll post a reply just to close the loop for future searches.

    LRM2 Today, 05:44 PM Go to last post

    Re: 1968 3hp cowling seal

    Peter will know what fits.-------I think type 4 will fit.----The 3 HP cowling seal in 1968 was likely the same as the 69 and latter 4 HP.---Shows same

    racerone Today, 05:22 PM Go to last post