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    2006 Mercruiser 8.1 HorizonS: what should water pressure be?

    Hello I'm just wondering; does anyone know what the correct water pressure range is for my motors. I've recently replaced (with all OEM) Manifolds, water pumps, raw water hoses, thermostat and heat exchangers on my 2006 8.1 with 800 hours on the upper chesapeake. port runs at 13.5 PSI and...
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    2006 Mercruiser 8.1 Horizon S MIE Single point drain question...

    Hi all, I just changed out the sea water pump and found that the two hard plastic tubes (one white/ one green) that connect the single point drain schrader pump fitting to the sea water pump are pulled out of the water pump and just hanging there. (thanks Pleasure cove marina for more evidence...
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    2006 8.1 Horizon S electrical help needed.

    Hi all hoping someone can point me a good direction. went to start boat for first time this year and it started up and idled perfectly. I noticed that stbd motor was reading battery voltage at the gauge on the helm and the gauge on the electric panel in the cabin and was not charging. so I...
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    is it normal for the IAC to start smoking?; 2006 Horizon 8.1S

    I have a 2006 Sea Ray with Mercruiser 8.1S Horizon (Serial number 0W393xxx) with VDrives. That I purchased May 2019 with 700 hours on the original engines. Now the engines have about 860 hours on them. For the past two seasons (since I’ve owned the boat) the port motor has stalled if idled...
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    2006 Horizon 8.1 exhaust manifold lifespan

    Hello Guys: I'd like to get your thoughts on my manifolds. I just bought a new to me boat with 2006 Mercruiser Horizon 8.1 V-Drives with 750 hours. the elbows and exhaust manifolds are Originals, now 13 years old. I bought the boat from the original owner who lift kept the boat it's entire...
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    Kohler gas generator question

    is there a forum section to get help with a gas generator? looking for thoughts and suggestions on a generator issue I’m having a boat I recently bought has a kohler 6KW gas generator that starts easily and runs perfectly for about 35 minutes. Then it begins surging reving up and down for...
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    Are These engines Closed Cooled?

    Hello, quick question: I believe these are closed cooled engines but can someone confirm by this pic? I am buying this boat and just had a panic attack that I didn't confirm these are closed cooled and not raw water cooled. the Neither the listing nor any other documentation I have indicates...
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    Engine surveyor needed in Solomon’s island MD

    Hello all im boat shopping and have found one in Solomon’s Island, MD (about 90 minutes south of Annapolis) Can anyone suggest a good engine surveyor please. engines are twin 2006 Mercruiser 8.1 Horizon 370HP with V drives thanks for any suggestions!
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    how do I check for flapper valve parts in the transom housing

    HI all: I'm convinced I have broken off flapper valves stuck in the transom assembly on my engine and am looking for suggestions on how to determine if this is true. twin 2001 5.7 2bbl with Alpha 1 Gen2. the starboard engine overheated july 2017. not too bad though... I was doing a WOT test...
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    Morse controls rebuild kit?

    Hello I have a question about my Morse shifter binnacle 1987 27’ tiara with twin 2001 5.7 apha1 gen 2, 2bbl carbs my Morse shifters were a little stiff and noisy when shifting. I also noticed that the sprig loaded ball bearing had worn a deep groove in the plate with the detents in it. so...
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    Troubleshooting Vibrations

    Hi all. I’m hoping the knowledge trust can give me some ideas on what to look for to troubleshoot this i have twin 2001 5.7 2bbl alpha one gen 2 engines last Sunday while coming up on plane at 2800 rpm at 22kts after anchoring for lunch I heard and felt “thunk”. i immediately powered down and...
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    VDO tach setup

    Hi all my 30 year old vdo tach won’t go over 1000 rpm i purchased a nos one on line that looks the same but is 15 years newer the new one has 8 dip switches on the back and no instructions on how to configure them ive been trying to find a manual on line for several days unsuccessfully...
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    2001 5.7 alpha one gen 2 stuck flapper ?

    Hello just getting my boat ready for the season and wanted some advice. last year I had an overheat alarm on my starboard engine. i replaced with new oem Mercruiser: manifolds elbows, all water hoses, thermostat, water pump, flapper valves. on my stbd Y pipe, half of the old flapper valve was...
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    looking for a hand held tach recommendation

    Hello all I'm in need of a good (accurate) hand held tachometer and thought I would see if you all had any recommendations. I have a pair of 2001 5.7 alpha 1 motors with 2bbl carbs and thunderbolt V ignition, if it matters. I want to dial in my idle speed with something more accurate than the...
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    Helm switch wiring with diodes

    Hi all I’ve just replaced all my old toggle switches for my helm. Batteries are are out of the boat dove haven’t tested yet. As I was driving back to the house it occurred to me that I may have wired them incorrectly. The old old toggle switches had top lights in them that illuminated...
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    Idiot light control module

    hello all I’m working on the electrics of my 30 year old Tiara. i have a series of warning lights on the dash that are not hooked up. Behind the dash are these two red circuit boards that seem to control the warning lights. I’ve traced some of the wires from the circuit board and am trying to...
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    Mercruiser service manual 24 misprint?

    Hello all im installing new exhaust elbows on my 2001 5.7 alpha 1 gen 2 in service manual 24 it says to apply a 3 mm bead of thread sealant to both sides of the elbow to manifold gasket and to use “Perfect seal” on the bolt threads. shouldnt it be the other way around? i would have expected...
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    Adding an autopilot questions

    Hello now that (knock on wood) my mechanical and maintenance tasks are up to date I’m turning my attention to the fun stuff id like to add an autopilot system to my boat and would like some suggestions boat is 27’ with twin 5.7 alpha 1 drives 8,000 lbs stearing is cable driven with power...
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    mercathode question

    Where does this piece mount? Item 1 in the diagram I'm having some electrolysis issues with my outdrives and my boat has what I believe is an older version of this part mounted to the transom of the hull just below the water line. does part 1 mount to the transom or to the outdrive?
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    Electrolysis damage...cause of overheating?

    Can this cause overheating? mercruiser 5.7 alpha one gen 2
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