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help me
i just changed the impeller on the sea water pick up on a z222 shabah with a 7.4 merc 1999 model bravo one . Does the system need some kind of reverse flush or is their a collector because the impella was in peices and couldnt locate all the peices thanks luke
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help me
I've never heard of anyone doing a reverse flush to get broken bits out... Most likely it travelled through the system and came out the exhaust.
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Hello Luke,
As far as I can remember, there isn't any filter or collector on the 7.4 open sea water cooling system so chances are the broken pieces have flushed out or will flush out if they're small enough. The problem I can see is if a piece is stuck to the thermostat. Have you tested the engine after you changed the impeller? If not, them do so and monitor the temp especially around the exhaust manifolds for at least 10 minutes. This should tell you if there are any blockages. Or if you’re still concerned, just contact any authorized Mercruiser service center for their advice. WetWilly |
thanks
Messaged Censored by MariahMan
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what is wrong
what was not appropiate in this message mariah man
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thanks
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Hi Luke,
Removing the hoses and trying to back flush with a water hose wouldn't hurt. If you do remove the hoses, remember to back flush the oil cooler as I believe this is the first unit the waters flows through after leaving the main pump and this is where the missing pieces may be sitting in. After the cooler, the water then it goes to the thermostat housing where it is diverted to the motor, front water pump and the exhaust manifolds and elbows. WetWilly |
Champion
Thanks for your reply wet willy your responce is greatly apreciated . When i perchaced the impeller 4 the sea water pick up the guy said ,make sure you put all the missing peices back together so you know that their is no more peices in the engine.. is that posible ? wouldnt some get flushed out? the guy at the spare parts shop made me paranoid and im hesitant to start it up with out double checking .
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Hi Luke,
If the pieces were small then they most likely they went out through the exhaust and assuming the boat was running in the water at the time, you’re unlikely to find all the pieces. Since you did the impeller change yourself, I'm sure you noticed that the exit opening for the primary pump wasn't very large so the pieces that broke off would have to have been that size or smaller to get through. For your peace of mind, go ahead and remove the hoses at the Thermostat Housing, Oil Cooler and Front Water pump, try to back flush. Afterwards, with a narrow flashlight, check inside each of them for any signs of the broken pieces. If all looks clean, then I would put it all back together. If the boat is out of the water, hookup the earmuffs to the outdrive, turn on the water and start up the motor. Let the motor idle until it reaches normal operating temperature, check for leaks and keep monitoring the temp especially around the exhaust manifolds for at least 5 to 10 minutes after that. Should the temperature continue to rise, shut off the motor but let the water continue to run until the motor has cooled down. Otherwise, if everything looks good, then you should be fine for good times out on the water. WetWilly |
your the best wet willy your very helpfull
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mr wet willy another question my boat has 140 hours on it , always up to date servicing and runs like a watch
should i be thinking of a rebuild at this point before any thing breaks and worps to prevent a expensive repairs later |
It was my pleasure Luke, we're all here to help each other.
Let us know what you find and how everything turns out, OK? Take care, WetWilly |
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As I said earlier, the best thing you could do is to take your Shabah to a Mercruiser Service Shop and have them inspect the entire motor/outdrive and give you a report on its condition and if it needs any work, this goes for the missing impeller parts as well. I say this not because of the hours, but because of the age. Our 96 Talari had about 400 hours on it when we bought it. Had it checked out by a Mercruiser Service Center and they said the motor was fine but the outdrive needed work due to a leak in the drive shaft bellow. WetWilly |
"mr wet willy" ????? I think Luke just gave our super moderator a new nickname! :rolling_laugh:
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Naw, that's too formal for me Mikey, but thanks anyway! :wink_thumbup:
Plain old "WetWilly" |
Mr wet willy , why do they call you wet willy ? is it because you always got your ding in a dong . i made sure i didnt use the word c_ _ t
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Thanks for not using the other language... We like to keep things civil here.
You know, you’re the first one to ask about my name...the truth is really kind of funny! When I was joining this site, my daughter sneaked up behind me and stuck a "wet" finger in my ear... Well, you can imagine my reaction... and I demanded to know why she did what she did. Turns out, she just wanted to play a prank on the old man and she explained that it was called a "WetWilly". So the name kind of stuck and it seem appropriate for my online ID here. So know you know the whole story! WetWilly |
seriosly that is the funiest . I like this story because i always give my wife a wet willy but i dont use my finger
hahaha |
I had my winterization done this year. This is the first winter I have had the boat so the mechanic checked the impeller and found peices of the last impeller still stuck in the housing, which had damaged the new impellar that was installed before I owned the boat. When I bought the boat I thought that I had a water hose leaking at the water pump. I leaked about a gallon of water an hour into the bildge. So I left it, no big deal. During my winterization my mechanic let me know that the leak that I thought was the hose was actaully the water pump.:shakehead: The previous owner or mechanic just pulled out what peices he could feel and shoved a new impeller into the existing housing. Poor desision it took out the water pump. When you buy a new impeller it comes with a new housing. Change both. I asked about peices in the engine and he said if the peices can get past the pump and thermastat, there not big enoughto do any damage as the water is on the cooling side of the engine not the combustion side.
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