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    Seawater intake scoop questions

    I have a 2002 5.7 Mercruiser 260 HP EFI I/O I want to plug the hose from the outdrive to the pump and install a through hull scoop in its place. 1. How large a hose do I need? 2. Is an additional strainer required? (There isn't one on the original system.) Thanks,
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    Base Timing using electronic tools

    My engine is a 2002 Mercuiser 5.7 liter 260 HP EFI, serial number OL687277 The timing indicator normally attached to the timing cover is missing. Can timing be adjusted using a diagnostic computer?
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    Power Steering Pump needed

    I need a power steering pump for my Mercruiser 0L687277. It is a 2002 EFI 5.7 liter (350 cid) gas engine. The Service manual I have shows 90507A12, but the tag on the pump reservoir says 26007703 It looks like the ordinary GM pump used on cars. I found some on EBAY, but would prefer to cross...
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    Dual prop installation

    When installing the second prop, is it important to pick a particular angle relative to the first one? A local mechanic told me there is a particular orientation to maximize performance. Thanks, John
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    Fishtailing outdrive

    I have heard that Mercruiser outdrives can oscillate back and forth at low speed with steering wheel held steady. I am not sure whether there is any slack in the mechanism, but the issue continued even with a new outdrive. It is a nuisance to constantly have to steer back and forth to try to...
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    Jackstand Placement

    A winterizing publication recommends three jackstands on each side boats exceeding 26 feet. Mine is 28.5 and weighs 7300 pounds. The marina place two wooden blocks under each side of the boat. They are right at the aft end of the hull and at the out edge of the transom. The two jackstands...
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    Zero ethanol gas fuel economy

    I had a good opportunity to compare MPG with 10% (New York) and 0% (Vermont) ethanol gas on my 5.7Liter EFI. I averaged 15-20% better with 0% ethanol. This was while running several tankfulls of each on the same 700 mile cruise in Lake Champlain under very similar weather and cruising...
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    Dipstick level wrong?

    I pumped all the oil out of my Mercruiser 5.7 liter EFI engine, changed the filter and added 4.7 quarts. The dipstick shows about one quart too high after running the engine to fill the filter and build pressure for a couple minutes. This is my first time with this engine in my boat, but I...
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    Steering backlash

    My boat is a 2003 Bayliner with Bravo III outdrive on a 260 HP 5.7 liter GM engine. I bought it a few months ago. At low speeds, it fishtails in a very annoying fashion. Difficult to keep going straight. No problem at higher speeds. There is a little looseness in the steering wheel rack...
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    Erattic engine efficiency

    I installed a flow meter before taking a long distance cruise two weeks ago, from Newburgh, New York up the Hudson River, Champlain Canal, Lake Champlain and Richelieu River and return. Heading north on New York 10% ethanol gas, 89 octane, the boat consistently used 1.6 GPH at 3500 HPM, for...
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    5.7 liter EFI Won't idle after running at high speed

    This is a 2003 Bayliner with a 5.7 liter Mercruiser EFI 260 HP engine. Engine starts fine and runs up to speed fine. After running at 3500 RPM for about 30 minutes, the tachometer began to jump erratically higher, while the engine ran steadily. I gradually slowed down to 1100 RPM as I...
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