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    Mercruiser 7.4L heat exchanger repair

    Hello everyone, I’m a new owner of a straight inboard boat equipped with a fresh water cooling system. Yesterday I had my starboard engine start overheating so I shut it down and limped in on port. I just located what I hope is the only problem with cooling system. One of the copper 90 degree...
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    Twin motor question. 2 standard rotation or 1 Std & 1 rev.

    Does it matter? Advantage,disadvantage of either. Have 1 working Std rotation on port now. Bad motor pulled on starboard side. Was STD rotation. Looking for any info that may be helpful in moving forward… literally and figuratively.. thx
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    Loud Synchronized bang at about 4-5 sec intervals coming from alpha 1. ?

    So, I replaced the shift cable from merc. 5.7 to outdrive and still same problem, then I swapped lower unit out (with a used one), then I swapped the shift lever out because it seemed a little “sloppy” but nothing. Another merc/alpha boater said it could be a bent or worn shift shaft. Has anyone...
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    Merc boggs down at 2,300 rpm’s when in gear.

    So 350 gm block with alpha 1 gen 1 outdrive. Put her in gear, give her gas everything is peachy until around 2,300 rpm’s and she starts bogging down. Starts up perfect, idles perfect, put her in neutral and she purrs at 4K rpm.. but not in gear.. electric fuel pump with Holley dbl pmp carb. I’m...
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    Gel coat advice

    Hello everyone. I bought a can of gelcoat(no wax) at my local boat store 3 hrs ago. Opened the lid, grabbed my cordless dewalt drill, a small paddle bit and the can had about 2” of solids on the bottom. I proceeded to try and mix the can up and in every motion and speed possible and here I am...
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    Alpha one gen 2

    Hello, hope everyone is well. I am replacing The 5.7 In my boat with A 7.4 and was hoping someone might know if the outdrive has to be changed for larger motor..? Thx
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    Alpha 1 Drive shaft

    Sooo I’m no boat mechanic but I have pulled off about a half dozen mercruiser outdrives and never once.... until now ran in to an issue where the driveshaft Would not release(I had to hammer the nut off with a punch to remove unit) I tried everything I could think of today to pull it out and it...
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    Trim sender, gauge or wiring issues..not working. Where to start?

    Just looking for any input on the best way to diagnose the cause of faulty reading. Tried lowering unit, loosening screws and adjusting the sensor Both directions and gauge never moved from all up position. Was thinking That the next step I might take is to disconnect sensor wires from terminals...
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    Starter replacement issue

    I’m thinking I was probably given the wrong starter but figured I’d check with you all before I tear it back out. I replaced my starter because the drive(bendix ) quit and starter was just spinning without engaging flywheel. So I bolt on a newbie, reconnect wires and as soon as I turn my battery...
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    Info help needed regarding Engine swap

    Does anyone know if I replace my 5.7 mercruiser with same size pcm engine will it be compatible with the Alpha1 gen 1 outdrive currently in boat? The replacement pcm engine is also a vortex and the merc Coming out isn’t, does this matter?
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    5.7 Gm mercruiser coolant issue

    Hello All. I am trying to figure out if a the engine block in a boat I recently purchased is done or not. Boat was not winterized when I picked it up but no exterior cracks to block, manifolds, risers are visible. I was told that the risers/ manifolds were bad and caused water to get into...
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    Please help..Stuck on stupid today!

    Ok, it’s Monday and I’m feeling pretty stupid for even throwing this question out there but I have the day off today and wanted to take this opportunity to install a controller in an 87 Thompson cruiser that I have been(painstakingly) trying to restore. So I hooked the cables and cut out switch...
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    Hole in Alpha 1 lower housing

    Here’s what I do know Hole location: Bottom rear (closest to transom) right above tiny weep hole is now a high performance super flo hole. Appears to be located in a separate cavity in casting..isolated from shaft, gears and such at least where the hole is located.. drive: I/O alpha 1 with...
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    Need help troubleshooting high idle problem.

    Hello all, I have 350 Chevy/ with alpha 1. I have a Merc. 2bbl carb with edelbrock intake mnfld & what appears to be an automotive distributor and accel coil. Standard cap, coil is separate. I have an electric choke on carb with 1 lead coming off + side of coil and a second lead which apparently...
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    Problem turning engine counter clockwise

    Hello everyone. Recently was gifted a chapparell project boat.. stop laughing..:-). Powered with Inboard 5.7 sbc. I am an electrician by trade, have alway been a wrench and screwdriver kinda guy and Figure I’d give it a shot. Got her home about 2 weeks ago and after installing a new battery...
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    5L Merc advice

    Hello Gentleman, this is my first post so I will apologize now if I fail to follow protocol in any way. I bought a 25' double axel trailer in good shape and a 25' sunray that needs some renovations. The boat currently has a 305 carbureted merc. With a cracked block I assume. I was was not...
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