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    Mercruiser 4.3 cracked intake manifold

    I knew my boat was high on the bow end, and it's also high on the starboard side. That would make it difficult for the water to drain from the passageway above the #1 and #3 cylinders. I have a feeling that was my downfall.
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    Mercruiser 4.3 cracked intake manifold

    I was surprised how easy those bolts came off. Appreciate the heads up.
  3. L

    Mercruiser 4.3 cracked intake manifold

    If this is the hose you're talking about, I have a drain port on it.
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    Mercruiser 4.3 cracked intake manifold

    Today I pulled all the spark plugs, they all looked good. I drained all the water from the motor, it all looked good. At no time did any water escape from the motor into the boat, it's all internal. Although I did have a small drip for a day around the harmonic balancer, but that must have...
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    Mercruiser 4.3 cracked intake manifold

    I've never pulled the plug on front of the intake, but obviously I'm going to have to change my winterizing procedure. My latest theory on why this happened, is I jack up the front of the boat as far as it can safely go, for the winter. I do that to help the bilge drain after draining the...
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    Mercruiser 4.3 cracked intake manifold

    I started draining my milkshake on Monday, so far I haven't tried using kerosene, or even turning it over. I'm guessing about 2-3 gallons of water came out before the oil started. In the side view picture below, the bottom layer is water, and it finally has a steady, but small, stream coming...
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    Mercruiser 4.3 cracked intake manifold

    About that bigger hose from the thermostat housing, I did have to install a check valve on that hose about 8 years ago. It's the blue cylinder in the picture, and it added a new water drain to my routine. Instead of the usual 6 drain points, I now have 7, and that drains the bigger hose which...
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    Mercruiser 4.3 cracked intake manifold

    In the 20 years of owning this boat, I don't remember ever adding antifreeze to it, and yes I noticed the rust in the thermostat housing. It will be part of my de-winterizing routine from now on. I've never pulled any hoses, except to replace the spark plugs. I've always just removed the plug...
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    Mercruiser 4.3 cracked intake manifold

    Not removing the plug on the intake has to be what did me in, after 20 years of not doing that, I thought I had it all figured out.. After I got the intake off yesterday, I got to thinking about the water settling to the bottom of the engine (the bearings), and another panic set in.. so I went...
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    Mercruiser 4.3 cracked intake manifold

    The square plug you're asking about, forward on the intake, is the one plug I've never removed, I had no idea about that plug till yesterday while trying to do some research on here. Apparently that lack of knowledge (negligence) on my part is what did me in. You are correct, I meant to say...
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    Mercruiser 4.3 cracked intake manifold

    Last Wednesday I dewinterized my boat, a 2001 Mercruiser 4.3 EFI. It turned into a bad day! Below are notes I made afterward while it was still fresh in my head.... - I hooked up water. - The engine started quickly. - After a couple minutes water started coming out the back of the boat...
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    Outboard spark plug wire replacement

    In need of a little guidance... my outboard has been more difficult to start so I decided to replace the spark plugs since it's been a couple years, and while doing so I noticed the spark plug wires are very corroded. Rather than trying to clean them up I decided to replace them with new ones...
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    2007 50 HP ELPTO tilt/trim problem

    Good morning! I have a 2007 50 hp 2 stroke, and the tilt/trim motor has an issue. I was getting the boat ready to go fishing and the outboard was in the full down position, when I went to trim it up nothing happened. I took the engine cowl off and I could hear a click on the solenoid (I think...
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    2001 Mercruiser 4.3 EFI fuel jet problem

    Hello all, hope everyone had a good Memorial Day weekend. Ours was good for the most part, except.... took the boat out for the first time this year, and it ran very rough with no power. Long story short, I took the flame arrestor off and noticed only one of my fuel jets (port side) was...
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    Mercruiser 4.3 EFI will not restart, intermittent problem.

    Hello, I own a 2001 SeaRay Sundeck, with a Mercruiser 4.3 EFI engine (S/N 0M010426). I am experiencing an intermittent problem where the motor will not restart, usually after turning it off. This is a very frustrating problem, because no error codes are registering, and it starts ok by the...
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