raw water pump leak on Yanmar 3Gm30F - Page 2 - SailNet Community
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post #11 of 25 Old 06-05-2008 Thread Starter
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great advice everyone !

I'll try some of these ideas before I invest too much $$... I also got someone saying the old pumps are still avaliable at far more reasonable price but might have a different impeller. I'm taking it off and replacing the impeller first, last year a mechanic did the replacement so it will be nice to get to know this myself. thanks again everyone and I'll post updates as I go.

I'm also replacing fuel filters on it but that might be another post entirely

Gaute
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post #12 of 25 Old 06-05-2008
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It's not the impeller that's causing the leak.
It will be the shaft seal that's doing it. The seal is not expensive, but check that the shaft is not a-wobble. If it is, it is likely to fail the new seal promptly. I had to buy a new pump then, for my olde Volvo.
Look carefully as to from where it is dripping.
If you do need a new pump, there are likely to be after-market replacements... mine was from Jabsco, and it cost about £75 ($150) back in 1994.
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post #13 of 25 Old 06-08-2008 Thread Starter
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removed pump and big oops

ok, I removed the pump today, pretty easy... opened it to inspect the impeller and found that two wings are missing. I'm was terrified where they could have gone so I started looking thru the hose going to the engine. One fell out when I started bending it but one is completely missing....

Has anyone experienced anything like this and should I get the expert to take the whole thing apart looking for the second blade ?

I'm also wanting a new pump for it, the one I have has some rust on the bolts and the shaft so I'm going for a new and keeping this as a spare. I found the one I need and there are a variety of models but a replacement for the exact same thing if $160... not bad..

I'd really appreciate some feedback on the blade, its making me really nervous.
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post #14 of 25 Old 06-08-2008
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Where did you get the replacement from. I have the exact same engine.

Dave


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post #15 of 25 Old 06-08-2008
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i've got the 2gm20f and believe that they are realively the same in this aspect. get the shop manual! it's the bible. i've been having problems with mine cooling systyem and after cleaned the strainer and changed my impeller i took out the heat exchanger. it's at the top of the engine. if you're only looking for an impeller wing just take the front off. only 4 bolts on mine (once i got the fuel filter out of the way ( two bolts)) at that point you will see the 3" across tube with about 70 holes in it for the sea water cooling. don't disturbe the gasket or you'll lose all your anti freeze. your impeller wing couldn't have gotten any farther than that in one piece.

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post #16 of 25 Old 06-08-2008
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sorry for the additional reply, I'd call a guy named Bob that works in the Yanmar distributer for the area. his number is 1-866-526-9717. he's worth talking to . . . (i'll be calling him tomorrow about my 2gm20f flow post )

good luck ,

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post #17 of 25 Old 06-08-2008 Thread Starter
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I'll start digging thru the engine

I thought there might be somewhere it would get stuck. I have the shop manual but the pictures are hard to read, atleast for me, and I'm not that mechanically savvy yet.... I thought the fuel filter was way in the back on left side but I do see where the hose goes into the head exchanger... I'll see how far I get, atleast the mechanic won't have to pull it all apart.

Dave, I got mine from a non Yanmar dealer, they say this is the same pump I have (from Johnson in sweden) and its not the new Yanmar distributors sells today. The price difference is $300 (actually $550 at highest quote I got), I'm still not 100% this part fits but the vendor was positive and willing to repay if it doesnt. I'll send you name and number when I know its a match and it works for my engine. I'm a bit hesitant sending out names of vendors until I know they are the real deal. I'll know wednesday, if I can get my impeller part out

thanks !
Gaute
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post #18 of 25 Old 06-09-2008
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ok, I removed the pump today, pretty easy... opened it to inspect the impeller and found that two wings are missing. I'm was terrified where they could have gone so I started looking thru the hose going to the engine. One fell out when I started bending it but one is completely missing....

Has anyone experienced anything like this and should I get the expert to take the whole thing apart looking for the second blade ?

I'm also wanting a new pump for it, the one I have has some rust on the bolts and the shaft so I'm going for a new and keeping this as a spare. I found the one I need and there are a variety of models but a replacement for the exact same thing if $160... not bad..

I'd really appreciate some feedback on the blade, its making me really nervous.
It should indeed make you nervous, but it's not the kind of thing you can't do yourself. First thing is to completely remove the hose from the raw water pump to the heat exchanger, and straighten it out and look through it, to see if there is any chance it got stuck sideways in there. That's the most likely thing in my opinion, and is an easy fix - just get yourself a new hose. If not that, then check your exchanger. If you do replace the hose, make sure you ziptie it out in such a way that the belts won't abrade against it.

Adamtroyg gives good advice - if you're just looking to see if you've got a blade stuck in your heat exchanger, you can take the front plate off, should be pretty easy. If you don't see the blade in there, keep looking downstream, which should mean a smaller hose between your exchanger and your mixing elbow.

If the blade part was able to pass through that hose into the elbow, then chances are it passed all the way through the elbow (which has a wider cross section than the hose) and through the muffler and out the boat, so I wouldn't worry past that. You just want to make sure your heat exchanger is clear of debris.

My experience with impeller wings on these pumps is they have a tendency to tear in two locations, one right by the bulb and one down at the base. If you can't find the wing in those two places mentioned above, then it's likely it tore into small enough pieces to pass through your whole system. That or it's floating in your muffler, upstream of the baffle, which probably isn't any harm so don't worry about it. Screwing around with your muffler can be a big PITA, as they tend to break if you push/pull on them too hard while you're trying to hose clamp them. (personal experience, ugh, I hate mufflers)

I realize you may be a little freaked out about this experience, but it's happened to plenty of us, and in the end it's just incentive to check the impeller once a season. And now that you know how to fix it, you can troubleshoot similar problems in the future should they arise, which is an important skill for a sailboater. I can't tell you how many major malfunctions I've fixed while on the hook. It's part of the fun.

beej67, Checkered Past, 1980 32' Pearson 323, Panama City FL
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post #19 of 25 Old 06-09-2008 Thread Starter
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thanks Beej

great post Beej and getting a kind word in addition to experienced hel is great. your right, its part of the fun but I was expecting a small little maintenance and it turned into a piece lodged into the engine somewhere, atleast thats what I thought at the time.

Good advice on the hose, since one piece was in the host chances are the other one is too, there is a ziptie or two guiding it so I'll make sure I mark those locations... is this hose of a specific type ? it seemed to have a cover that was somewhat different, like a paint on it.... I'll call the local yanmar guys tomorrow they are great for small parts.

thanks for all help guys I'll post an update as I get the pump wed and hopefully install it same day or thursday.... oh also, how long can I run the engine while debugging the raw water problem ? I'm thinking the impellers probably need water as well as the engine not over heating, just trying to figure how much time I have to test the new setup.

thanks!
Gaute
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post #20 of 25 Old 06-10-2008
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One impeller blade in the system will not cause you any problems unless you're extremely unlucky. Despite soem doom-prophet posts above it simply isn't big enough to cause a blockage in the cooling system.

The probable worst-case scenario would be if it gets stuck in the thermostat and stops it from closing. Even here it isn't big enough to noticeably restrict flow and it will more likely cause the engine to run cooler rather than hotter.

Don't sweat about not finding it, it's more than likely long gone anyway.

Andre
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