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    Replace OMC 3.0 with Mercruiser 3.0

    I have a 1988 OMC 3.0L with a lovely crack along the block. When looking for a replacement, can I use a Mercruiser 3.0 instead? What is the difference in the engine that would not allow this transplant?
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    Convert OMC 3.0L to Mercruiser

    I own a '89 boat with a 3.0L OMC and OMC Cobra outdrive. The engine block is cracked and the stern drive needs new gears. I have a chance to buy a similar year boat with a bad transom/floor with a 3.0L engine and Mercruiser outdrive. What would it take to convert my good boat over using the...
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    OMC 3.0L Sterndrive repair/swap

    I took my 1989 OMC 3.0L sterndrive to the shop to get the gears properly shimmed. I lack the proper tools to do so, and I know they had NO shims whatsoever. Once it was opened by the mechanic, there was gear wear (not surprising since it had no shims, and before I had it, no castle nut to hold...
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    Re-rebuild an OMC 3.0L carb?

    On a boat I bought a month ago, with an OMC 3.0L and Rochester 2GC carb, I had issues with it starting and running. A friend helped me rebuild the carb while at a campsite. We cleaned all the surfaces well, but did not tank the carb nor have compressed air to assist us in cleaning. The carb...
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    OMC 3.0L hard to start

    I have a 1989 OMC 3.0L with a 2-bbl carb. I have fixed many a thing on this boat, from overheating to a fuel gauge and oil pressure gauge to faulty shifting...this appears to be my LAST hurdle to get it on the water! It is a B*TCH to start! I have to crank the engine for at least 5 minutes...
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    OMC Cobra Outdrive won't pull in water

    I have a 1989 3.0L OMC with a Cobra outdrive. With water-muffs on it, water is not always pulled into the system, it seemed to help when I pressed the muffs against the outdrive. I have replaced the intake impeller, which had one cracked fin. Took it to the water today, and it failed to pull...
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    Cobra Outdrive Lockring issue?

    I recently purchased a 1989 boat with a 3.0L and Cobra outdrive. The previous owner revealed to me that in the past year, bearings in the outdrive were replaced. He then showed me the Clymer repair manual, where it shows disassembling the upper gear housing. He commented that he did not...
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    Boat too slow to get on plane, rebuild structure?

    I have a 1979 Imperial 15' fiberglass tri-hull with a 55 Evinrude. The engine runs great. It was a dog when I bought it, but a new prop of a different pitch made it run. Here is the issue. With one person in the boat, it will top out at about 27 mph; with two people, about 25-26 mph; a third...
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