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  1. R

    3.0 running hot 200F

    I have 2005 Mercruiser 3.0 that's running at 190 - 200 degrees with a 160 degree thermostat which seems high. A couple weeks back it overheated and I replaced the sea water impellor, water tube, water circulation pump, thermostat (160 degree), manifold, and riser. The only thing that needed...
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    Valve Adjustment, 2004 3.0

    I have a 2004 Mercruiser 3.0 and that I rebuilt. Ever since, the engine pings / knocks. When I put the engine back together, I adjusted valves per the service manual. The timing has been adjusted, carb rebuilt, and high octane gas was used to try and work the pinging out and none of these...
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    Crud in carburetor, is it a problem?

    My boat pings and back fires during acceleration but it idles fine. When I can get it on plane, it's 10 mph (25 vs 35 mph) slower than before having problems. It's a 2004 mercruiser 3.0 with 180 hours. Could this crud in my carburetor be the problem? Any tips on cleaning and rebuilding it?
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    Is my engine shot? Low compression, Mercruiser 3.0

    My 2003 Mercruisrer 3.0 (4 cyl.) would crank but not run. I checked the for spark, fuel, and compression. It's getting fuel and spark. The cylinder compression reads 70psi (cyl 1), 45psi (cyl 2), 30psi (cyl 3), 50psi (cyl 4). I pulled the manifold and this is what I found, see picture. I plan...
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    Not Turning Over, Low Compression, Mercruiser 3.0

    My 2003 Mercruisrer 3.0 (4 cyl.) would crank but not run. I checked the for spark, fuel, and compression. It's getting fuel and spark (although I don't know how string the spark is). The cylinder compression reads 70psi (cyl 1), 45psi (cyl 2), 30psi (cyl 3), 50psi (cyl 3). The engine has 130 hrs...
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