Recent content by emsisson

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    OMC800 HP limits?

    I was talking with a friend about putting a new timing chain on my 1978 OMC800/Ford 351. One thing led to another and he started talking about why not replace the intake manifold, and up the horsepower beyond the 240 it is rated at. The boat could use the extra HP, but I wonder what the design...
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    Idle and Tach problem - OMC800/351 Ford

    Over the past few weeks I've noticed when starting, my tach jumps all over the place, but the engine seeems to be idling fine. The engine will be running about 700RPM but the tach will indicate 1500, then drop to 500 then zoom up to 2000. I've also had a problem with running at idle, the boat...
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    OMC 800 won't shift under load

    Had a bad shift cable, replaced it. Checked cable from console to engine, OK. Did center out-of-gear procedure on shift converter box, OK. Put muffs on, ran engine, shifted gears perfectly. Put prop in water, won't shift, chatters, will not go into gear. I'm guessing stripped gears or something...
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    OMC800 stringer shift problem - solved

    After months of fighting shifting problems on my OMC800 I finally found the answer. This is not a question, simply a post to perhaps solve the same problem someone else might face in the future. For months the distance between the forward and reverse shift points on the converter box were...
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    OMC800 shift cable replacement Q's

    Has anyone replaced the shift cable on an OMC800 stringer? Got the manual but it looks a little touchy... It's a '78 240 hp.
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    shifting changed

    1978 OMC800 stringer. Pulled the outdrive to rebuild the waterpump. After replacing the outdrive the shift points have moved so far from the center position on the converter box that the engine begins to build rpm's before the forward gear engages. If I try to put it in reverse it chatters...
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