Hunter 49, etc impeller changing

A

artboas

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Jun 1, 2009
1,845
Hunter 49 toronto
kloudie1 said:
A friend's Beneteau 43 CC has very similar problem with the same Yanmar engine. We were able to pull the pump cover plate with a small ratcheting 90 degree screwdriver (http://www.harborfreight.com/8-piece-right-angle-screwdriver-92630.html) then using a long 90 degree pliers,(http://www.harborfreight.com/16-inch-long-reach-pliers-set-38598.html) grab the impeller and by tapping the pliers rearward, we got the impeller out.. Not an easy job, and can't be done on a hot engine.
He'd bought the official Yanmar impeller puller for the engine and it did not even come close with the restricted access.
Note that on the new models of the engine, the pump faces forward and is actually accessible.
Click to expand
On the Beneteau 43cc, they don't come close to having the problem we have. The engine on the Beneteau is mounted above floor, whereas on the 49 it is below floor.
That means that the sides are totally inaccessible. Still, your buddy had a nasty time doing this.'
I agree that a right angle ratchet is a good tool, but I have an additional idea. In all spaces where it is virtually impossible to easily access screws, I change them over to socket head cap screws. You can buy stainless ones in any thread & length.
The advantage is that they are Allen key drive. So, the first trick is to use a bit of masking tape to hold the screw onto the Allen key. Now, it will go anywhere you want without dropping it.
Once you start it in the hole, there is nothing easier than an Allen key for positively driving in a screw.
 
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A

artboas

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Jun 1, 2009
1,845
Hunter 49 toronto
mz4wheeler said:
Having a flow switch on the pump intake would instantly protect your engine if the flow stopped, but if one of the impeller blades busted it may not. Can you adjust the pressure settings of the flow switch?
Click to expand
The short answer is yes, you can adjust the pressure. But, it's not a finely calibrated setting like on an actual flow sensor. Therefore, it would be subject to false tripping if you tried to tune it that closely.
Flow sensors work on displacement. The intake blockage sensors work on negative pressure on the output of the sensor. (Referenced to input)
 
A

artboas

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Jun 1, 2009
1,845
Hunter 49 toronto
Stu Jackson said:
Because they are tractor engines dropped into boats by builders who didn't think it would matter to folks with 49 foot boats, thinking they'd pay to have maintenance done, instead of thinking that skippers would need to do their own maintenance. That's why!

If the engine was on a tractor, the access would be just fine!

Look, there aren't many boats out there that are perfect. But some are much better than others.

Good owners associations are really hepful to avoid having to reinvent the wheel.

This forum is great, too, but I find it unusual to find this issue being brought up for the first time here. It's gotta to have been solved before.

Have you tried a Google search? Really. I got castigated for suggesting this a year ago, but sometimes it's very helpful to expand the search beyond a single forum.

Good luck.
Click to expand
This is not the first time this was posted. Lots of comments prior. The reason I'm bringing this forward is because (I believe) I have a viable solution. I will be posting this soon, assuming it works.
 
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tkwhalen

tkwhalen

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Jun 8, 2004
285
Hunter 49 60803 Lake Erie
Can't wait to see how you solve my problem.... looking forward to your 10 minute impeller change
 
tkwhalen

tkwhalen

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Jun 8, 2004
285
Hunter 49 60803 Lake Erie
Should we assume the idea fell short of your expectations? or is the test still in planning and test out stages?
 
A

artboas

.
Jun 1, 2009
1,845
Hunter 49 toronto
tkwhalen said:
Should we assume the idea fell short of your expectations? or is the test still in planning and test out stages?
Click to expand
Hi
I required another hospital visit, and the doctors told me that I was sidelined for a bit. So, I've hired some mechanics to install my upgrade. I'm meeting with them this Friday AM, and I'm walking them through it. Should be about a week.
I promise that the moment this is proven to work, it's going on the site

Regards to all

Arthur
 
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JamesG161

JamesG161

SBO Weather and Forecasting Forum Jim & John
Feb 14, 2014
7,817
Hunter 430 Waveland, MS
Stu Jackson said:
I got castigated for suggesting this a year ago
Click to expand
Oh My Gosh! Did your voice go up 2 octaves after castigation?:biggrin:

I now appreciate my Volvo Penta (I used to envy Yanmar owners). I can sit on my aft berth, open vertical hatch, sing a sea ditty, and change my impeller in about 20.

Can you install a mirror or use a fiber optic camera to help? I have this and it works great to see around and under.
http://www.harborfreight.com/Digital-Inspection-Camera-61839.html

Mirror
http://www.harborfreight.com/2-inch-mirror-with-flexible-shaft-97217.html

Avoid tight spaces... normally
Jim...
 
A

artboas

.
Jun 1, 2009
1,845
Hunter 49 toronto
artboas said:
Hi
I required another hospital visit, and the doctors told me that I was sidelined for a bit. So, I've hired some mechanics to install my upgrade. I'm meeting with them this Friday AM, and I'm walking them through it. Should be about a week.
I promise that the moment this is proven to work, it's going on the site

Regards to all

Arthur
Click to expand
IT WORKS !!!!!!!

Well, it's been a long day. Started at 8 AM, and just finished (6 PM)
I am thoroughly thrilled to report that my impeller changing system works perfectly. Excluding removing the stairs, it takes about 10 minutes.
The first thing I needed to do was actually pull my existing impeller , which I've never done. What a major pain in the rear!!!
It would be impossible to change this in a bouncing seaway. My existing impeller was missing 2 blades, and had more cracks in it. No way I could have made it to the 1000 islands with this.

So, I'm going to document all this up, and post (as I always do)
Once done. Feel free to PM me
 
A

artboas

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Jun 1, 2009
1,845
Hunter 49 toronto
Ok, I'm just staying on boat for next 2 nights. Need to be on my PC to do a PDF. I'll do it as soon as I'm back at the house.
 
A

artboas

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Jun 1, 2009
1,845
Hunter 49 toronto
SEMPERAVANTI41 said:
Please post ASAP! My impeller needs replacement, waiting for instructions.
Click to expand
Quick question
Did you do the engine access modification I detailed for the 49s some time back? I see that you have a 50AC, but I suspect you have the same floor access issue. Please ensure you look for my post
 
SEMPERAVANTI41

SEMPERAVANTI41

.
Jun 15, 2012
715
BAVARIA C57 Greenport, NY
artboas, I have read your floor modification post. Is it possible that this issue was resolved on the 50? When I open the generator compartment I don't see underfloor blocking access to the engine. I have not yet removed the "cabinet" that surrounds the engine above the floor which would fully reveal whether the modification is needed. Does your boat have a removable stainless steel rod welded to a stainless flat that supports the aft end of the generator hatch?
 
Brezzin

Brezzin

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Sep 20, 2006
155
Hunter 49 Mystic CT
Mine has that bar.
You would need to remove the case covering the engine to see if the modification is necessary or just feel for it with your fingers. I did the modification and it has been a huge benefit when working on the engine.
 
A

artboas

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Jun 1, 2009
1,845
Hunter 49 toronto
Hello there
You need to remove the engine hatch cover, which means ( of course) pulling the stairs.
I am just about finished with the write-up for the 10 minute impeller change. Having some problems getting the photos into the doc
Will likely just publish to the site with a pdf that you can open.
Not sure if I mentioned it, but I had a pro-mechanic on board to help with this, as I needed help with pulling the original impeller. At dock, it took a mechanic almost 2 hours.
The impeller (which was original) was missing 2 vanes. I caught this just in time.
 
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M

macdu

.
Aug 31, 2014
13
Hunter 49 Vancouver
artboas said:
Hello there
You need to remove the engine hatch cover, which means ( of course) pulling the stairs.
I am just about finished with the write-up for the 10 minute impeller change. Having some problems getting the photos into the doc
Will likely just publish to the site with a pdf that you can open.
Not sure if I mentioned it, but I had a pro-mechanic on board to help with this, as I needed help with pulling the original impeller. At dock, it took a mechanic almost 2 hours.
The impeller (which was original) was missing 2 vanes. I caught this just in time.
Click to expand
Hello Art
Was wondering if you were able to finish your PDF? I'm very keen to see your modifications for a simpler h49 impeller change. I did make your earlier floor modification for easier engine access and really couldn't believe the difference. I can't imagine what you've come up with for this and would like to see it. Thanks
 
A

artboas

.
Jun 1, 2009
1,845
Hunter 49 toronto
macdu said:
Hello Art
Was wondering if you were able to finish your PDF? I'm very keen to see your modifications for a simpler h49 impeller change. I did make your earlier floor modification for easier engine access and really couldn't believe the difference. I can't imagine what you've come up with for this and would like to see it. Thanks
Click to expand
Hi
The mod works & it's perfect.
Problem is that I've started & stopped my write-up a few times. I'll get it finished, but going to take a few more nights.
I can email you the doc if you wish.
Just pm me, and give me your email address. I'll send it to you that way
 
Bizbat

Bizbat

.
Jun 26, 2016
4
Hunter 49 Olympia
Hi all, Arthur's document is now complete. Search this forum for "Impeller" and you will find a post by Bizbat containing the PDF attached.
Please comment on the other thread.
Thanks
 
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