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    3.0 cobra snapped impeller shaft

    While running around the lake today, I saw my temp gauge rising too high. shut 'er down and trailered boat back home. I was shocked to find that the impeller drive shaft had broken. Is this some Cobra quirk? How does the shaft break? There is nothing wrong with the impeller, and everything had...
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    BOAT "WANDERS"

    HI ALL,<br />I HAVE A QUESTION ABOUT BOAT HANDLING AT LOW SPEEDS.<br />MY BOAT IS AN '86 4 WINNS 170 HORIZON, WITH 3.0<br />ENGINE.<br />WHEN I'M DRIVING " NORMALLY" ON PLANE, IT HANDLES REALLY WELL- I HOLD THE WHEEL STILL, AND THE BOAT GOES STRAIGHT, BUT IF I'M TRYING TO DRIVE AT ABOUT 10 TO 15...
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    4 winns gas tank venting

    Hi guys,<br />It's my first time back on the forum this year, and I need some help.<br />Last year, I bought a 4 winns 170 horizon 3.0 liter. It's been a good little boat, except for one problem. When I fill the gas tank after a day of boating, and then park at home, everything is fine. The...
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    OMC 3.0- What's the reduction ratio?

    I'm trying to figure out what prop my boat needs and was wondering what the gear reduction ratio of my 1986 3.0 OMC COBRA is.<br />Thanks, John
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    3.0 Cobra knocking noise

    My 1986 3.0 Cobra has begun to make a loud rapping noise(I was boating with the engine cover off) which sounds like a rod knock (could be) which I only hear when the boat is under way on the water. Running in the driveway it sounds normal, which makes me think that it's either load-related, or...
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    OMC COBRA 3.0 timing marks

    Hi, I have a 1986 3.0 Cobra, and I was attempting to check the timing yesterday, when I found that the numbers on the timing tab were unreadable due to rust. I tried to scrape the rust off, but it was too deep, and there is no sign of a number anywhere.The tab has 4 or 5 "points" on it, each one...
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    checking OMC outdrive gear lube

    Hi all, I've got a question concerning the maintenance of my OMC Cobra outdrive. According to the manual that I have, the gear lube is checked by a dipstick on the top of the housing.<br />There are 2 plugs on the lower part of the drive, one for draining, and one higher up, supposedly for...
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    1986 OMC COBRA tilt/trim gauge

    My new (1986) boat has a 3.0 Cobra drive in it, and the trim gauge always reads full up, regardless of drive position. I've got a manual on order, but I have the time to work on it this week, and was wondering if there are any common causes of this problem or things that i could check. Any help...
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    3.0 Cobra horsepower

    I just got a 1986 4 Winns with a 3.0 4 cyl engine.<br />Does anybody know what the horsepower rating is, or were there several options?<br />Thanks, John
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    omc Cobra water pump

    Just purchased a 1986 4 Winns with a 3.0 Cobra drive.<br />While trying to run it on muffs in the driveway, it was over heating due to lack of water flow, so I pulled off the impeller housing to take a look.<br />The impeller was in good shape, but when I turned the hose on, there wasn't any...
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    MERC 140 WATER IN #6 CYLINDER

    Hi all,<br />I have a 1979 Mercury inline six outboard that sometimes misses at low RPM's.<br />I pulled all the plugs to check them and found the #6 plug clean except for a milky white coating indicating water entering the cylinder from somewhere. Does anyone out there have experience with...
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    140 mercury weak fuel pump

    Hi all,<br />I think I got a few clues the other day about my lack of power problem. When the boat bogs dwn, I touch the choke button and it picks right up for a second. If I keep on tapping the button, the engine accelerates and then finally dies.<br />Since this seems to indicate fuel...
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    merc 140 water in cylinder

    Hi everyone,<br />I'm new to outboards, so have some patience please.<br />I have become the owner of a 1979 140 horse inline six mercury engine on a 16 foot boat.<br />I have been having trouble with intermittant power loss, particularly after low speed running, and a rough idle. Wide open,it...
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    140 MERC wont rev up

    Hi, I have a problem with my 1979 Merc. 140 6 cyl.<br />After I get it started, I can idle out of the no wake zone, but when I attempt to accelerate, I can only open the throttle a little bit or the engine will slow down and eventually die, I can keep the engine running at about 2000 RPM...
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    MERCURY 140 hard starting

    Hi, I have trouble starting my 1979 140 Merc outboard.<br />I have to put the idle control lever all the way up and hold the choke button down while cranking the engine for about 10 seconds. It then fires and kicks the starter out, but does not start. I have to repeat this about 3 times before...
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