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    Mercruiser 5.7 alternator replacement

    I found this website, thanks. https://public-mercurymarine.sysonline.com/Default.aspx?sysname=NorthAmerica&company=Guest&NA_KEY=NA_KEY_VALUE&langIF=eng&langDB=eng Do you know the difference between the two different Mando alternators that they list?
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    Mercruiser 5.7 alternator replacement

    The belt doesn't look glazed but I like the "squirt of water" suggestion. I don't want to start it now because it's winterized and it will be well below freezing for months to come. This is a V belt alternator.
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    Mercruiser 5.7 alternator replacement

    This website doesn't show alternator for my 1990 Mercruiser 4 BL, Alpha 1 sterndrive
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    Mercruiser 5.7 alternator replacement

    I'm in Washington state. I have relatives in Milwaukee :) I don't think I need it upgraded, just repaired. It is giving a high pitched squeal that needs to go away. I wonder if a dab of oil would quiet it?? Probably not a permanent fix... I have a local, very good, alternator/starter...
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    Mercruiser 5.7 alternator replacement

    Good information. I only need an oem 55 amp model. Where and/or how did you search to use the engine serial number to get the alternator number? I did a Google search by the alternator number you gave me and there are so many options. I would only use a marine alternator but what is the...
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    Mercruiser 5.7 alternator replacement

    I have a 1990 Sea Ray with a 5.7 L, raw water cooled engine, serial number OC759123. I need some help figuring out what alternator I need to purchase. I haven't removed the old alternator yet. Will the old alternator have a number on it that I can reference online for a replacement or is...
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    Mercruiser Alpha 1 OEM prop selection

    Searching again I found: Amazon prop: Meruzue14-1/4Dia X 21Pitch Boat Outboard Propeller for Mercruiser Alpha One Prop/Mercury Engine 135 150 175 200 220 225 250 300HP,3-Blade Aluminum 14.25dia... Amazon prop: Mercury Marine Blackmax 3 Blade Aluminum Prop Propeller 12-3/4 x 21P 48-77348A45 I...
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    Mercruiser Alpha 1 OEM prop selection

    That number I gave is the only one on the prop. If I go by that number it looks to me to be a 21 pitch prop. Looking online I see 14", 14 1/4" and 15" prop diameters with that pitch which is why I was asking about diameter. Do they all have the cupping on the edge of the prop? I don't see...
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    Mercruiser Alpha 1 OEM prop selection

    What about the diameter of the prop? My prop looks small and putting a tape measure to it comes up with about 13" but it's hard to tell. Is there any good trick to measure the diameter of the prop?
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    Mercruiser Alpha 1 OEM prop selection

    Thank Jack, that does sound like the most accurate way to determine the needed prop. I was just wanting to know what prop was on the boat when new. Is there a chart or something that might tell me?
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    Mercruiser Alpha 1 OEM prop selection

    New boat to me. It has a Mercruiser 5.7L Alpha 1 Gen 1 Engine serial number OC759123. The 3 blade prop on the outdrive now is number QA1918X21P. This prop looks small for the outdrive so I'm looking to verify if it is the correct OEM prop and purchase a spare prop. Any help would be appreciated.
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    Power steering problem diagnosis

    I hate to start throwing parts at it when there are 5 parts to the system. I don't think it's the late style actuator since it's a 1990 and online parts seem to be showing the replacement as old style. If there is a lag what does it tell me?
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    Power steering problem diagnosis

    I have a 1990 Sea Ray 5.7 L with an Alpha One sterndrive. This boat is new to me. I have no history on it. Engine serial number OC759123 and transom serial number OC895445. The power steering reservoir is full. No unusual noises. The problem I have is stiff and choppy steering. It's also...
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    Mercruiser 5.7 overheating, raw water cooled Alpha 1 Gen 1 sterndrive

    Jack is a true wealth of knowledge. Many thanks to Jack for his tireless determination to solve my overheating problem! I learned many tips and tricks for working on a Mercruiser and marine applications in general. I've always worked on jet engines, cars, trucks and tractors but I only have a...
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    Mercruiser 5.7 overheating, raw water cooled Alpha 1 Gen 1 sterndrive

    Is the tag on the lower unit that says REMAN 5010147R1 the serial number for it? Or is that the part number or casting number. Where would I find the serial number? What does "MR" stand for? Online searching was coming up with "MR" and "R". I was comparing the base and gaskets online and...
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    Mercruiser 5.7 overheating, raw water cooled Alpha 1 Gen 1 sterndrive

    Thanks. Do you have a diagram for the orings and other seals near the sterndrive impeller for this model? The tag on the lower unit says Alpha 1 REMAN 5010147R1 if that helps or do you just need to know Alpha 1 Gen 1 ? What do you think of the impeller pictures? Is this exceptional or pretty...
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    Mercruiser 5.7 overheating, raw water cooled Alpha 1 Gen 1 sterndrive

    Can a bad seal between the upper and lower halves of the lift pump cause my over heating? I cleaned up the lower half sealing surface when I replaced the upper half but it was kind of rough. I put it back together hoping the gasket would fix it.
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    Mercruiser 5.7 overheating, raw water cooled Alpha 1 Gen 1 sterndrive

    I will attach pictures of the impeller and impeller housing. Part of the impeller housing was melted through. Pieces of the impeller were melted onto the inside of the impeller housing. The impeller itself has pieces missing and is jagged but the pieces might have come off and melted to the...
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    Mercruiser 5.7 overheating, raw water cooled Alpha 1 Gen 1 sterndrive

    Yes, there was a rubber cup in the new housing but not in the old.... The copper tube presses into it, correct? The copper tube was intact and seemed rigid and attached to the upper case. I'm thinking I was okay putting it together. I'll install a new pump with base and check under the...
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    Mercruiser 5.7 overheating, raw water cooled Alpha 1 Gen 1 sterndrive

    Just wondering what the rubber cup looked like. Thanks for the description. The diagram isn't clear and the part was missing when I took it apart. I've had other outdrives apart and removed the full outdrive to replace the Gimbal bearing and bellows and removed the lower unit a few times on...
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