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3JH4e heat-exchanger cleaning

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Ratbasher View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ratbasher Quote  Post ReplyReply Direct Link To This Post Posted: 26 February 2023 at 13:05
H400 (2008) 'Wight Leopard', Gosport UK
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wild Quote  Post ReplyReply Direct Link To This Post Posted: 26 February 2023 at 13:06
Hello 
I believe you have the 129670-13561 before 2006 129670-13560 RED circle arround 400 euroís 
 We have the 129470-13541 GREEN circle 1.000 euroís 


Edited by Wild - 26 February 2023 at 13:11
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rock Quote  Post ReplyReply Direct Link To This Post Posted: 26 February 2023 at 15:37

Right, so with the side covers off the cooler core should slide out.
I already have the gaskets.

That is good, would not have  looked  forward to remove the whole heat exchanger from  the cylinder head.

Thanks !
Hanse 400e "M-square2" #0241
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rock Quote  Post ReplyReply Direct Link To This Post Posted: 16 April 2023 at 18:26
While changing my coolant, decided to check my thermostat.

Removed the black yanmar angled hose between the heatexchanger and the Ďlidí under which the thermostat sits.

The  nipple, on which the hose sits, is quite dirty, looks like some sort of Loctite was used on it to ensure the hose connection was tight.
I assume this was done by yanmar.

Does anybody know, or can confirm,  that Loctite type sealant is used for hose connections ?
Is that normal ?




The reddish residue close to the end of the nipple


Edited by Rock - 16 April 2023 at 18:27
Hanse 400e "M-square2" #0241
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rock Quote  Post ReplyReply Direct Link To This Post Posted: 16 April 2023 at 18:38
Also took off my exhaust elbow.

Looks like new on the outside.
Inside has carbon built up.
Tried to remove with wire brush.

See some pitting on the inside.
Really surprised me, didnít expect that in a gaseous environment (rather in submerged metals)
Will try to get it sandblasted to see better, but will probably order a new exhaust elbow from Ben at exhaustelbow.com.



Also, on the inside of the manifold to which the elbow is bolted, seeing some chrystallized matter, assume itís salt.

Does this look Ďnormalí , others seen this ?





Thanks in advance for input.
Peter


Edited by Rock - 16 April 2023 at 18:39
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ratbasher Quote  Post ReplyReply Direct Link To This Post Posted: 17 April 2023 at 09:45
Hi Peter - no, the 'loctite'-like substance looks like a bodge-job to me, perhaps to compensate for a poorly-fitting (or fitted) hose.  I connected mine back up again with a new hose and the usual double jubilee clips and its been fine.  The crystals you see are almost certainly salt and and quite common; my boat's elbow had the same pitting as well.  I think you're doing the right thing by replacing it completely; I'd suggest doing all the hoses at the same time. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jojo Quote  Post ReplyReply Direct Link To This Post Posted: 17 April 2023 at 10:00
 Hi
That pitted area you say can be a cast thing from manufacturing that part 
As you donít see that on more than this 

Regards that question about locktite 
I think itís residue from coolant and new hose I always put some Vaseline so that it forms better when applying force from the hoseclamp so no kind of rinks occurring 

Regards Jonas 
3 Cabin, Hanse 342, Tiller version.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rock Quote  Post ReplyReply Direct Link To This Post Posted: 17 April 2023 at 16:42
Thanks,

My new hoses will be applied without any goo.

This what the elbow looks like after a nice sandblast



Outside like brand new.

Inside really has a lot of pitting.
Donít think itís from casting.
The elbow is made from sheet and stainless tubing.



The pitting isnít through and through, but some look quite deep.
I estimate the inner tube to be 2 mm, some pitting to be at least 1 mm.

Must be the effect of 400-500 c (?) exhaust gases constantly  hitting the stainless steel that is splashed with water at the same time.

Anyways, the new elbow is on its way from Ben Cotton.

Hanse 400e "M-square2" #0241
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rock Quote  Post ReplyReply Direct Link To This Post Posted: 17 April 2023 at 16:55
Couple more pictures from the rubber exhaust hose side.




The inside of the large diameter outer tube, the hose fits on, shows no pitting.



 Neither does the outside of the inner tube, that sees cold water all the time.

Must really be the hot exhaust gasses.

Hanse 400e "M-square2" #0241
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rock Quote  Post ReplyReply Direct Link To This Post Posted: 27 April 2023 at 09:23
So, I received the elbow from the US. 
Now understand that the standard item is with the offset nipple.
If a straight version is required, Ben cuts off the flange and reattaches it with a new weld.
That weld is rather coarse, and so is the leading edge from the flange to the inner pipe.
I am wary of the finish of the piece, not for esthetic reasons but for what it means functionally, more resistance for the exhaust gasses. The pitting in the old elbow suggests this is a critical area.

The other thing  I noticed is that the opening between the nipple and inner pipe appears smaller than with the original.
Wary of pressure build up at the water injection point.

Am I thinking this through too far, worried for nothing ?




Hanse 400e "M-square2" #0241
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