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    Trim will go up but not down

    Alright, I need some help with this trim pump on my 1993 Gulfstream (Merc 3.7 Alpha 1 Gen 1). Over the weekend, I replaced the carpet in my boat so I had to remove all of the side panels and move some of the harnesses out of the way which included unhooking the harness to my trim pump. Long...
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    Major coolant leak coming from behind harmonic balancer merc I/o 3.7

    Ok so I got a major coolant leak and I’m hoping it’s not a blown head gasket. I’m working on a merc 3.7 488, and recently I drained the coolant system to replace the seals on the heat exchanger and a leaking riser. Today when I went to replace the coolant, I put one gallon in and a few seconds...
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    Merc 3.7 Wiring Diagram

    I have a Bayliner with a 488; when i bought the boat, the helm gauge wiring was corroded to the point where it needed to be replaced. So far I have replaced the main engine harness and all of the wiring to the accessory switches (Bilge, lights, ect) but not I need to replace and clean up the...
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    Old 488 replacement idea

    What’s a good replacement engine for the old 488. The one I have is bleeding coolant and possibly seized. Any ideas of a good replacement motor I was thinking the 3.0
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    Water pouring from harmonic balancer area on muffs

    Alright guys I need help confirming my motor in my project boat is toast. Mercruiser 488 3.7 with closed cooling system Been working on this boat for a while now, but I think I'm to the point where the motor is toast. When I got the boat the electrical system was a mess and the trim wasn't...
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    Slave solenoid does nothing

    Alright guys another question when attempting to crank the Mercruiser 488, the starter clicks but the slave solenoid doesn’t seem to be doing anything. When I turn over the motor i am 100% sure the starter is clicking but I hear nothing from the slave solenoid. When I attempted to jump the...
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    Advise on starting a engine that has been sitting for unknown amount of time

    Alright guys I needs some advice, I recently acquired a boat with a Mercruiser 488 that has sat up for an unknown amount of time, the engine itself looks pretty good, however, it is dry, no coolant or no power steering fluid. The did stick shows a little milk which I’m hoping is nothing more...
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    Power Steering fluid question

    I have a question about what power steering fluid I should use for my Merc 488 3.7. When looking at the power steering reservoir, it doesn't give me a recommended type and I have not been able to locate the service Manuel for the motor. I have done a bit of research and have found power...
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    Mystery trim/tilt motor

    Alright guys here’s another one the trim/tilt motor in this boat is a total mystery. In every boat I’ve had the fluid reservoir has been attached to the motor. On this one it’s not (see pic for reference) who can educate me on this motor
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    Fluid Reservoir identification

    Alrighty folks, I have another novice question for this 488 3.7 mercruiser. What is the fluid reservoir for that sits right behind the top flywheel and in front of the oil pan. Im used to dealing with outboards so this set up is a bit new to me. I have looked at many engine diagrams but have...
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    Speedo connection point Mercruiser 411 with gen 1 drive

    My boat has an old school Mercruiser 488 in it with a first gen outdrive. It’s the one that has the oil plug on the left side. I’m in the process of restoring the boat and when I was tracing the Speedo tube, I noticed that it was cut about half way to the motor. I have looked everywhere for the...
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    Mercruiser 488 with alpha drive gen 1

    My boat has an old school Mercruiser 488 in it with a first gen outdrive. It’s the one that has the oil plug on the left side. I’m in the process of restoring the boat and when I was tracing the Speedo tube, I noticed that it was cut about half way to the motor. I have looked everywhere for the...
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    Mercruser 3.7 488 wiring help

    I inherited a 93 Petit Manan bow rider which I am in the process of restoring. The boat itself is in pretty good shape, but the electrical is a mess. When I got the boat the main engine harness was cut along with the harness running from the trim/tilt to the throttle. The throttle and trim/tilt...
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    Mercruiser 3.0 Sputtering at idle and low speed

    I bought a 98 Sylvan runabout with a Mercruiser 3.0 Aplha 1 on it about a month ago, I had it out on the lake 15-20 hours and everything has worked perfectly. Yesterday on the lake, the engine began sputtering and knocking like it was starving for gas and would cut off at low speed or idle, it...
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    plug question

    I have a 98 sylvan v1800... should the screw plug go on the inside or the outside this is the first time i have owned a boat with a screw plug
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    Starter question mercruiser 3.0 alpha one gen 2

    I have a bad starter on my mercruiser 3.0, the current starter does not have the 90 amp fuse which I’ve seen in most diagrams. I’m replacing the starter should I get the fuse as well. The starter and the fuse are for a 95 bayloner capri? This boat was bought with. Bad starter the fuse was not on...
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    Trim pump question

    I had to change my trim pumps Solenoids both upper and lower. Other then the clicking from the bad solenoids the pump works fine and responded well to the control lever. Now that it’s reinstalled I’m not getting any response from the control box/ lever. I ran a pair of jumper cables from the...
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    50 amp circuit breaker question

    I recently purchased a new 50 amp circuit breaker for my mercruiser 3.0. I’m rebuilding this engine and I’m new to this type of breaker. I took the breaker out of the box and I attempted to push the button in before I connected the wires. My understanding is that you are supposed to push the...
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    Mercruiser 3.0 won’t fire

    I have a mercruiser 3.0 alpha one I recently bought for a project. When I bought the boat the previous owner did not have the key so i replaced the ignition switch thinking I could test the motor and installed a new battery. The ignition was installed properly and the battery is fully charged...
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