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Post by artboas on Feb 3, 2016 3:01:14 GMT
I have read many threads about how difficult (nearly impossible) it is to change the rear facing water pump impellers on the 49DS and other models. I feel for you. I have a (non-Jeanneau) with a below floor mounted 4JH.
As agreed, you need to pull the alternator & water cooler to get at it.
Well, I'm not a mechanic, and the thought of doing this freaked me out.
I know it is quasi-possible to do at a dock, but under way in a sea is downright impossible.
GOOD NEWS everyone.
I spent the last 6 months working on this, and have a solution.
I have a method whereby you will be able to change your impeller in 15 minutes with zero effort. No, this isn't BS. It's true.
My boat is on the hard right now, and I'll be incorporating the "fix" first thing in the spring.
Feel free to PM me for more details.
I don't want to post the photos, etc now, cause I just want to 100% prove this out. But, I'm willing to talk with anyone who contacts me
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Post by dnickj on Feb 3, 2016 12:42:43 GMT
go on tell me your secret
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Post by artboas on Feb 3, 2016 14:31:19 GMT
Respectfulky, I am uncomfortable in posting the complete write up (which is fairly extensive) until my boat is launched in April, and I ensure this works as planned. The VERY nice folks at Yanmar feel quite positive about it, as do I.
But my background is engineering, and I know that you test everything before you publicise it.
I am merely alerting people to the fact that there will be a solution in place for their upcoming cruising this summer.
tgank you for your patience.
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Post by sleighride on Feb 3, 2016 19:46:19 GMT
I have been able to make impeller changes almost tolerable on DS 43 with same aft facing water pump on Yanmar. First, I installed Speed Seal face plate. Second, I cut off about one inch off the end of a metal impeller remover (the type with the adjustable hooks and wingnut to tighten.) I can remove impeller without taking apart any engine parts. Installing new impeller is not a problem to do by hand.
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Post by neil44i on Feb 3, 2016 20:51:43 GMT
I could not agree more that this is a difficult task. Wait until you have to service the pump itself. I recently purchased my 44i and there was a slight weep on the shaft seal of the raw water pump. In addition to having to remove the alternator, I had to remove the engine mount, which prevents one from pulling the pump. The previous owner let this go for a long time and the engine mount needed to be removed to wire brush/ospho and paint. I will be installing a new impeller with the rebuilt pump. I am concerned about having to change the impeller at sea, particularly offshore. I look forward to reading the work around for this.
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alita
New Member
Posts: 3 
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Post by alita on Mar 9, 2017 9:45:30 GMT
Respectfulky, I am uncomfortable in posting the complete write up (which is fairly extensive) until my boat is launched in April, and I ensure this works as planned. The VERY nice folks at Yanmar feel quite positive about it, as do I. But my background is engineering, and I know that you test everything before you publicise it. I am merely alerting people to the fact that there will be a solution in place for their upcoming cruising this summer. tgank you for your patience. Well, did it work then? Or is your silence an indication that it did not? The best that I can suggest is: 1. Ensure that once you get a new impeller in it is the genuine Yanmar type with threads 2. Swallow your outrage and buy the ludicrously over-priced Yanmar puller. All it comprises is a nut and bolt really but is over £30 3. Remain outraged that anyone could have put the pump rear facing and that Jeanneau did not think more about access. My engineer said he had a solution but that I would not like it: buy a new engine. The pump is front facing. He was right and I am not going to! |
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Post by Mistroma on Mar 11, 2017 10:39:15 GMT
Yes, the Yanmar puller is very expensive for a nut and bolt. Fortunately, it is easy to make one for around £2 and it was easy to find a brass blanking plug with the correct thread. The nut and slot headed bolt were just spare bits I had lying around. I'd put a wing nut and locking nut on the end if access was difficult as that would be easier to turn without having to use a screwdriver. Instructions here: www.mistroma.com/ImpellerExtractorTool.htmlThe threads on the genuine impeller are much easier to engage than trying to get a claw type puller to grip when access is poor. I'm afraid that there are no pictures of the finished article as it is on my boat in Sardinia. |
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bj
Junior Member
Posts: 22
Jeanneau Model: SO 45.2
Yacht Name: Atair
Home Port: Stockholm
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Post by bj on Mar 13, 2017 16:43:17 GMT
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Post by loredo on Mar 14, 2017 9:02:56 GMT
I agree that the rear facing raw water pump is less than desireable. Yet, I've found another way to change the impeller.
Take the whole pump put! Take off the inlet and outlet hoses, undo the four bolts holding it to the engine block. Ten minutes later you have the whole pump in your hands and at that point swapping the impeller is a breeze.
One thing worth to mention though. The original Janmar impellers last much longer than one might think. At first I changed the impeller yearly but they always looked very good upon close visual inspection. Last spring I decided it was time for a new impeller again. Yet, after 500 engine hours also this one looked still fine! I re-installed it... it's still going strong.
Food for thought.
Loredo
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Post by so36idavid on Mar 14, 2017 17:45:12 GMT
Loredo,
I had a genuine Yanmar impeller fail after less than 200 hrs. All of the vanes had cracks and several were gone and had to be tracked down in the heat exchanger. PITA. Maybe that impeller had sat on a shelf in the store for a long time but I've become distrustful of them. Impellers aren't terribly expensive, it's not worth pushing their limits. I inspect annually and change every other year regardless.
David
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Post by sleighride on Mar 16, 2017 0:11:21 GMT
I agree that the rear facing raw water pump is less than desireable. Yet, I've found another way to change the impeller. Take the whole pump put! Take off the inlet and outlet hoses, undo the four bolts holding it to the engine block. Ten minutes later you have the whole pump in your hands and at that point swapping the impeller is a breeze. Big problem for some of us to replace the entire pump. See comments above from Neil44i on the need to remove the engine mount to get the pump out. I have exactly the same problem with my 43DS. Removing an engine mount then requires realigning the shaft. Not exactly a great time saver just to change the impeller. |
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Post by pagoda54 on Mar 16, 2017 22:03:48 GMT
Yes, the Yanmar puller is very expensive for a nut and bolt. Fortunately, it is easy to make one for around £2 and it was easy to find a brass blanking plug with the correct thread. The nut and slot headed bolt were just spare bits I had lying around. I'd put a wing nut and locking nut on the end if access was difficult as that would be easier to turn without having to use a screwdriver. Instructions here: www.mistroma.com/ImpellerExtractorTool.htmlThe threads on the genuine impeller are much easier to engage than trying to get a claw type puller to grip when access is poor. I'm afraid that there are no pictures of the finished article as it is on my boat in Sardinia. There are countless inexpensive plugs (M18 x 1.5) in various materials identified as "blanking plugs for lambda sensors" on Ebay. Brass would be easier to work with than 316 though! |
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Post by Mistroma on Mar 19, 2017 12:12:42 GMT
Yes, the Yanmar puller is very expensive for a nut and bolt. Fortunately, it is easy to make one for around £2 and it was easy to find a brass blanking plug with the correct thread. The nut and slot headed bolt were just spare bits I had lying around. I'd put a wing nut and locking nut on the end if access was difficult as that would be easier to turn without having to use a screwdriver. Instructions here: www.mistroma.com/ImpellerExtractorTool.htmlThe threads on the genuine impeller are much easier to engage than trying to get a claw type puller to grip when access is poor. I'm afraid that there are no pictures of the finished article as it is on my boat in Sardinia. There are countless inexpensive plugs (M18 x 1.5) in various materials identified as "blanking plugs for lambda sensors" on Ebay. Brass would be easier to work with than 316 though! Yes, stainless will be harder to drill and the other problem with these is the flat base. Not too much drilling with allen key variety but you'd need to tap a thread for the screw. The brass blanking plug is hollow, so easy to drill a small hole then drop a nut into the hollow and hold it with some epoxy. The brass plug was also very cheap and easy to find at my local home plumbing supplier FBS as they stock a lot of brass items (well, they are called Falkirk Brass Supplies). |
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Post by artboas on Sept 21, 2022 8:35:00 GMT
Sorry for the delay!!!!
It worked 100% PERFECTLY
From the time you open your engine cover, to new water pump impeller is installed is <10 minutes.
At dock, rolling sea, no matter.
I did a full post in the Hunter Forums, and a bunch of people have done this fix.
You are welcome to PM me.
I’ll walk you through it. I wrote up a full procedure, actually
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Post by artboas on Sept 21, 2022 8:39:18 GMT
Re, painless way change water pump impeller in 10 minutes.
I didn’t discuss compensation ……
So far, everyone who has implemented this has offered me gratitude drinks at their club bar.
So,, that’s my price
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Post by Mistroma on Sept 21, 2022 18:05:00 GMT
Sorry for the delay!!!! It worked 100% PERFECTLY From the time you open your engine cover, to new water pump impeller is installed is <10 minutes. At dock, rolling sea, no matter. I did a full post in the Hunter Forums, and a bunch of people have done this fix. You are welcome to PM me. I’ll walk you through it. I wrote up a full procedure, actually Wouldn't it be more sensible to post the instructions? It would save people PMing individually over time. You said instructions had already been posted on another forum and you have a document detailing the procedure. It could be uploaded to the tips page of you PM a moderator. I'm lucky to have a 4JH4AE and the impeller swap is a trivial task. I made my own puller for a couple of pounds. I've seen pictures of some models with horribly place pumps and wondered why Yanmar didn't just fit a different pulley driven pump or drive it from a different attachment point. I guess they assume we all remove the engine and work on it in a well lit workshop.😅 |
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