3JH4e heat-exchanger cleaning

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   Hi Peter - in effect, yes.  This may help if you haven't already seen similar....
Heat Exchanger; Heat Exchanger Construction; Specifications Of Heat Exchanger; Disassembly And Reassembly Of The Heat Exchanger - Yanmar 3JH4E Service Manual [Page 291] | ManualsLib

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Ratbasher Members Profile Send Private Message Find Members Posts Add to Buddy List Commadore Joined: 31 May 2017 Location: Cyprus Status: Offline Points: 472	Post Options Post Reply Quote Ratbasher Report Post Thanks(0) Quote Reply Posted: 26 February 2023 at 13:05
	Hi Peter - in effect, yes. This may help if you haven't already seen similar.... Heat Exchanger; Heat Exchanger Construction; Specifications Of Heat Exchanger; Disassembly And Reassembly Of The Heat Exchanger - Yanmar 3JH4E Service Manual [Page 291] \| ManualsLib
	H400 (2008) 'Wight Leopard', Gosport UK

Wild Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 18 March 2010 Location: Turkey-Greece Status: Offline Points: 700	Post Options Post Reply Quote Wild Report Post Thanks(0) Quote Reply Posted: 26 February 2023 at 13:06
	Hello I believe you have the 129670-13561 before 2006 129670-13560 RED circle arround 400 euro’s We have the 129470-13541 GREEN circle 1.000 euro’s Edited by Wild - 26 February 2023 at 13:11
	Wild and Wet Belgium 545e#268

Rock Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 19 September 2014 Location: Netherlands Status: Offline Points: 319	Post Options Post Reply Quote Rock Report Post Thanks(0) Quote Reply 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

Rock Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 19 September 2014 Location: Netherlands Status: Offline Points: 319	Post Options Post Reply Quote Rock Report Post Thanks(0) Quote Reply 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 ‘lid’ 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

Rock Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 19 September 2014 Location: Netherlands Status: Offline Points: 319	Post Options Post Reply Quote Rock Report Post Thanks(0) Quote Reply 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, didn’t 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 it’s salt. Does this look ‘normal’ , others seen this ? Thanks in advance for input. Peter Edited by Rock - 16 April 2023 at 18:39
	Hanse 400e "M-square2" #0241

Ratbasher Members Profile Send Private Message Find Members Posts Add to Buddy List Commadore Joined: 31 May 2017 Location: Cyprus Status: Offline Points: 472	Post Options Post Reply Quote Ratbasher Report Post Thanks(0) Quote Reply 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.
	H400 (2008) 'Wight Leopard', Gosport UK

Jojo Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 03 August 2022 Location: liljeholmen swe Status: Offline Points: 88	Post Options Post Reply Quote Jojo Report Post Thanks(0) Quote Reply Posted: 17 April 2023 at 10:00
	Hi That pitted area you say can be a cast thing from manufacturing that part As you don’t see that on more than this Regards that question about locktite I think it’s 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.

Rock Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 19 September 2014 Location: Netherlands Status: Offline Points: 319	Post Options Post Reply Quote Rock Report Post Thanks(0) Quote Reply 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. Don’t think it’s from casting. The elbow is made from sheet and stainless tubing. The pitting isn’t 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

Rock Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 19 September 2014 Location: Netherlands Status: Offline Points: 319	Post Options Post Reply Quote Rock Report Post Thanks(0) Quote Reply 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

Rock Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 19 September 2014 Location: Netherlands Status: Offline Points: 319	Post Options Post Reply Quote Rock Report Post Thanks(0) Quote Reply 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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