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    Thermostat location question.

    My 5.0 Mercruiser I/0 has the thermostat located in the thermostat housing instead of in the engine block. Is this due to the "open loop" cooling aspect regarding coolant flow, or for some other reason? Thanks
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    Question about exhaust water flow and temperature.

    At the onset, I would like to thank those who dedicate their time to helping on this forum. Your help is simply invaluable to folks like myself who are just learning about marine engines or making a transition from other type of engine related activities. I flushed my "thru hull" dual exhaust...
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    Issue noted with Mercury water pump repair kit

    I decided to change my Alpha One Gen II impeller, so I obtained Mercury part # 817275K05. This kit is for drives s/n OD469859 and up - which my s/n OM xxxxxx falls within. For a "first timer", things went well until I installed the face (slinger) seal. The seal included had a bottom flared lip...
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    Is 230 hours on an 2018 boat grossly excessive?

    Would these hours concern you if you were interested in said boat? Seems very high to me, but I don't do much boat "cruising". More of a "hang out" at the local sand bar guy myself. The boat appears to be priced considerably lower than NADA (possibly because of the hours) but wont know much more...
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    Anyone reflash an ECM0402?

    I have what I thought was a 2003 ECM555 that turned out to be a2003 ECM0402. The Rinda diagnostic tool that I use shows 0.0 engine hours, 279,000 hours of mid range rpm usage (0.0 hours in all other ranges) and will not clear the rpm history. The adapter that I am using is for a standard 4 pin...
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    Any thoughts on troubleshooting my "mystery noise"?

    I have a 2004 5.0 Mercruiser with Alpha One that has developed a mystery noise from the alternator side of the motor. With the engine compartment closed, the noise sounds like a classic ticking lifter. With the engine compartment open, it sounds more like an exhaust leak. The boat has...
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    Service manual recommendations needed.

    Looking to pick up a couple of service manuals for my 2004 305 Mercruiser and corresponding Alpha One outdrive. Recommendations please. Thanks.
  8. V

    ? about impeller replacemnt kits.

    Greetings. I am about to embark on my first impeller replacement job and had a question about kits. I noticed that some kits have a replacement impeller metal cover and some do not. Is there any need to change the metal cover just as a matter of routine? or is it just a good idea to have one in...
  9. V

    Misaligned axle on trailer?

    I have a 23 foot single axle aluminum trailer with somewhat of an oddity. The axle does not appear to be centered inside the fender well. In fact, there is about three inches difference in the clearance between the front of the tire and the fender skirt and the back. As a matter of fact, you...
  10. V

    Question regarding oil change.

    I recently changed the oil and filter in a 5.0 Mercruiser sterndrive. I replaced the oil filter as well (which was installed with the most ridiculous amount of torque that I have ever encountered in changing an oil filter.) At any rate, the manual states the capacity to be 5 1/2 quarts with oil...
  11. V

    A different kind of speedo question

    What does the speedo assembly (if any) look like inside the lower unit of an Alpha One drive? I have looked at a few exploded views and simply cannot tell. I am trying to find out what is between the notch in the leading edge of the foot and the quick disconnect atop the lower unit where the...
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    Somewhat ambiguous info regarding winterizing engine in Merc manual

    I am still in the early stages of getting a handle on how I/O engine cooling works, but I ran into a bit of an interpretation issue with the manual for my 5.0 . The manual says the drain the block with the drain valve and add F, but does not specify how to do so. I have watched a few videos and...
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    Question regarding open cooling systems.

    I am trying to learn about I/O cooling systems, and I have a basic question: Do any or all Mercruisers employ both an impeller pump in the lower unit as well as a circulating pump on the front of the motor, or is it dependent on the size of the motor?? I was reading a tutorial that said that...
  14. V

    Question about speedo "V" notch in the leading edge of the lower unit.

    I have a plug in the speedo line that I have not been able to unplug with conventional methods. I am trying to get a "visual" on what is behind the "V" notch inside of the lower unit. Is it some type of aluminum tubing - machined in the drive itself - with a 90 degree bend that runs up to the...
  15. V

    "Newb" question about minor fiberglass hull repair

    I am considering making a few repairs to minor gouges in my hull this winter. These are all cosmetic (with no exposed fiberglass) that are mostly below the waterline. Some actually look like chips from where the tow vehicle might have thrown up rocks in a gravel parking lot at a boat ramp. That...
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    How many member here own multiple boats?

    I have recently considered buying a second boat. I really cannot justify it, but I have been wanting another boat to go along with our bowrider. The boat in question is a Malibu Wakesetter boat that I have become very fond of. I dont wakeboard, but I love the looks and the roominess .And, i have...
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    Any current or past Gekko boat owners here?

    Helping a buddy research a 2015 Gekko towboat. Looks like the company was started by a former Supra exec and has been in and out of production a few times. The last iteration was a joint venture that fizzled with Larson boats after three years. I had never heard of this brand until my buddy told...
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    Why multiple fuel filters?

    I have been reading a few threads where folks talk about having multiple fuel filters and I am trying to learn why multiples would be needed. As near as I can tell, my 2014 3.0 liter Mercruiser MPI only has one combo spin on type fuel filter/separator on the engine. Do different types of engines...
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    Trim/Tilt failure? Don't overlook the obvious!

    My limited knowledge rarely allows me to add anything to the forum, but I thought that I might share this for future reference: While taking my boat out of the water, my "down" Trim/Tilt stopped working. Fortunately, the "up" worked fine and I got the boat home. I first checked that the pump...
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    Rinda tool reads 270,000 engine hours.

    My buddy wanted to borrow my new Rinda Techmate to read his engine hours on his 2005 Merc 5.0 engine in various rpm ranges. Once we hooked up to his PCM 555 (I think), the Rinda tool read 270,000 engine hours and all in the 1500-3000 rpm range. All of the other ranges showed zero hours. The hour...
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