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  1. #1
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    Default Replacing Mercruiser Water Pick Up Hose

    Mercruiser 1998 V8 5.0 - I want to replace the water pick up hose on my mercruiser - can someone point me to a picture where this is located or tell me? Is this something that is easy to do - eg, I am not a mercruiser mechanic just a regular guy with basic mechanical skills.

  2. #2
    Honorary Moderator Emeritus Don S's Avatar
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    The OEM service manual for your particular drive details how to change it, but I really have to ask WHY you want to change it when you don't even know what it is or where it's located? Also, what kind of outdrive is it?
    There are OEM service manuals for download at the link below
    http://forums.iboats.com/mercruiser-i-o-inboard-engines-outdrives/merc-service-manual-links-251571.html
    Don S.


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  3. #3
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    I could not find the manual for the alpha one engine itself 1998, only one for the outdrive/transom. Do you have a specific link to the manual for me?

    It was recommended on this forum that to correct a high temp problem at slow trolling speeds to replace the water pick up hose which tends to kink over time, and to replace the elbows/risers. Already replaced the impellor.

  4. #4
    Honorary Moderator Emeritus Don S's Avatar
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    It was recommended on this forum that to correct a high temp problem at slow trolling speeds to replace the water pick up hose which tends to kink over time, and to replace the elbows/risers. Already replaced the impellor.
    You don't seem to quite understand the concept. This forum makes all kinds of suggestions, some are right some are wrong. What you have to do is find out exactly what is wrong with your engine and drive and not fix what is wrong with others. All that does is costs you a lot of money for replacing parts that aren't the problem.

    As far as engine manual, well, that depends on what engine you have.
    You might want to read this thread before you go any further.
    http://forums.iboats.com/mercruiser-i-o-inboard-engines-outdrives/how-ask-question-220416.html
    Don S.


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  5. #5
    Petty Officer 1st Class ken_23434's Avatar
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    Quote Originally Posted by scottyt22 View Post
    I could not find the manual for the alpha one engine itself 1998, only one for the outdrive/transom. Do you have a specific link to the manual for me?
    Alpha-1 is the outdrive (part hanging off back of the boat)

    You engine (part inside boat) can be various different models. 3.0 liter inline 4, 4.3 liter V-6, 5.0 or 5.7 liter V-8's.

    There is a water hose in the transom assembly for the Apha-1 Outdrive. You will also have water hoses inside the boat, the locations and function depends on the engine you have and if it is freshwater cooled or raw water cooled.
    20' Suntracker Pontoon

  6. #6
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    My engine is a 5.0. I called Mercruiser and here is the water pick up hose part number: 32-96246A4. Now friends, back to my question, does anyone have a picture of where this hose is located? It supposadly connects from the main engine to the transome.

  7. #7
    Lieutenant Commander bomar76's Avatar
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    Since you just want to throw parts at it instead of diagnosing, my suggestion would be to go out to the boat and look in the transom assebly.
    The last time religion controlled the world it was known as the Dark Ages

  8. #8
    Commander NHGuy's Avatar
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    It is pictured in the alpha 1 documentation. It goes from the forward facing inside of the drive to a barbed fitting on the transom assembly. It is a huge pain in the derriere to do the 1st time. I know... I changed the one on my 89 last year due to cracks and kinks. I wrestled with that thing for a while. It might have been harder for me though because I have oversized hands. The hose length is very important to keep it the correct shape.
    But even more important is the advice you already received.
    If you go through the diagnostic process you may be able to save hours of time.
    The hose is nothing more than good quality automotive heater hose, it is no high tech stuff. It's just a tough piece to install.

    Your smart move is to go the the adults only section in "Mercruiser & other I/O engines and drives" where you can get a link to a free download of the alpha 1 manual from Mercruiser. It goes into every possible detail. Including a process you can follow pretty easily to confirm water flow using a clear hose.
    1989 Baja Sunsport 196, Mercruiser 5.7, Alpha 1
    Moultonborough Neck, Lake Winnipesaukee, NH

  9. #9
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    have a good look on you ;www.youtube.com ,mercruiser and most engines are shown in picture form and general maintenance procedures with video capture.will be helpful for most basic maintenance.
    if your having trouble cooling engine unless your pipe has a gaping hole in it, the trouble probably lies at the impellor in lower leg hanging out the back of your boat. find your problem first then ask for further help.

  10. #10
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    Well I just bought the various parts and here is what I'm going to do - I'll let everyone know how it turns out. I will replace all the water hoses because I don't think they have every been replaced since 1994. Going to replace the thermostadt. Going to replace the Riser gaskets.

  11. #11
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    Lightbulb Re: Replacing Mercruiser Water Pick Up Hose

    how was the impeller when you replaced it, was missing any parts, what about the thermostat housing and the termostat, like they say just dont trow parts, you probably will keep having the same problem...

  12. #12
    Master Chief Petty Officer jtmarten's Avatar
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    What issue are you having that points you to the pickup hose? Is it visually leaking/pouring water from it while running on the muffs? On an Alpha 1 Gen1 it runs around the left side of the gimbal ring, tight against the transom housing.

  13. #13
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    Here are the results - I replaced the old thermostadt and all the water hoses. The risers and gaskets seemed fine - no leakage and no dirty discharge when the hoses were removed - so left them alone. Put the old thermostadt in hot water and it never opened up.

    Anyway, took the boat out and at very slow trolling speeds it stayed cool most of the time. It did still heat up to 200 degrees every once in a while, but cooled down quicker and stayed cool longer, when I reved the engine up in neutral or went faster. So still not perfect.

    So you can see that the engine still seems to be heating up more than it should. Someone mentioned that the radiator hot water sensor may be bad, so I'm going to replace that next and see what happens.

  14. #14
    Moderator Bondo's Avatar
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    The risers and gaskets seemed fine - no leakage and no dirty discharge when the hoses were removed - so left them alone.
    Ayuh,... If you don't pull the Risers, you can't see how Plugged up they are....
    Any Grease is Better,..... Than No Grease at All.......

  15. #15
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    I did pull one of the Risers, clean as a whistle.

  16. #16
    Master Chief Petty Officer jtmarten's Avatar
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    Was the old impeller shredded? Did you check the PS cooler to make sure it isn't clogged with old impeller pieces?

  17. #17
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    Quote Originally Posted by jtmarten View Post
    Was the old impeller shredded? Did you check the PS cooler to make sure it isn't clogged with old impeller pieces?
    I don't see where he replaced the impeller?? Sounds like a good step to take. But it doesn't sound like he followed Don's advise either.

  18. #18
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    The impeller was replaced by a mercruiser mechanic, the old impeller was not shredded and came out clean. I can only assume the marine yard mechanic did his job properly.

    So we have an engine that still heats up when trolling on the slowest in gear speed for long periods of time. It cools down quickly when I rev it up or speed up. With the radiator replaced it seems to stay cooler longer and cools down quicker.

    What's been done so far?

    - Impeller replaced
    - All water hoses replaced
    - Radiator replaced (Note, the old radiator did not open at all in hot water)
    - Pulled one of the Risers, all clean, replaced gasket and re-installed

    Next I'm going to replace the Water Temp Sender and check the wire for corrosion.

    Any other suggestions are appreciated!

  19. #19
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    Quote Originally Posted by scottyt22 View Post
    - Radiator replaced (Note, the old radiator did not open at all in hot water)
    you mean thermostate
    Slickcraft SS215 - 20'
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  20. #20
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    Sorry, yes correct, I replaced the Thermostate. That was a fun project, the toughest part was getting the old gasket off.

  21. #21
    Honorary Moderator Emeritus Don S's Avatar
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    Default Re: Replacing Mercruiser Water Pick Up Hose

    I closed Your Other Thread on the same subject. Please don't start 2 threads on the same subject.
    Don S.


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