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Diesel fuel line from CAV to engine sweating |
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SamsonII
Lieutenant Commander Joined: 19 July 2016 Location: Norway Status: Offline Points: 70 |
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Posted: 03 July 2019 at 07:27 |
Hi,
I have noticed that the fuel line from the CAV filter mounted on the diesel tank to the engine is sweating - there is a thin coat of diesel on the first 20-30 cm of the hose. I have dried it of, several times, but it comes back after some time. Have others had the same experience? The fuel line is the original that came with the boat when it was new in 2006. There are no cracks or other visual faults on the line. But should they be changed at a certain interval? Will they a some point start to weep just out of age?
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Stein-Erik Carlsen
Hanse 370e 2006 #41 "Samson II" |
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Captain Cook
Admiral Joined: 23 May 2006 Location: Denmark Status: Offline Points: 1009 |
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Yes, your fuel hoses should be changed after some years, I do not remember the exact interval, but I believe that your hoses are well fit for a renewal after 13 years. I renewed the hoses after 8-9 years Update: Just checked Yanmar Service Manual 3JH4E: Rubber fuel hoses: Change for every 500 hours of operation. The hose from watere separator filter to engine is moving when the engine is moving, and should be the first to show signs of stress. When I changed the fuel hose I found these interesting items inside the old hose:
Edited by Captain Cook - 01 March 2021 at 16:29 |
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Freya H400 #27 (2006), 40HP 3JH4E, 2-cabin, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB)
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SamsonII
Lieutenant Commander Joined: 19 July 2016 Location: Norway Status: Offline Points: 70 |
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I will definately replace all the lines before the holiday. What is the dimension used on the 3JH4E? My guess is 8mm. Hope to avoid disconnecting the present lines before I start the job. Guess diesel spill is difficult to avoyd...
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Stein-Erik Carlsen
Hanse 370e 2006 #41 "Samson II" |
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SamsonII
Lieutenant Commander Joined: 19 July 2016 Location: Norway Status: Offline Points: 70 |
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I found the answer myself in the installation manual (was available online):
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Stein-Erik Carlsen
Hanse 370e 2006 #41 "Samson II" |
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Lippe
Commadore Joined: 05 September 2009 Location: Finland Status: Offline Points: 356 |
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Fuel hoses on my 2008 3JH4-E are not flexible anymore and I will change them. Concerning de-aeration of the system is there any preferred way to do it. Whether I just disconnect them all and pump then oil to system using a manual pump installed in fuel line (similar than in outboards) or is it better to change hoses one by one?
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alettaenmarcel
Admiral Joined: 15 August 2006 Location: Netherlands Status: Offline Points: 1218 |
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our 370 is also from 2006. So far no problem with the original hoses but I will check this weekend.
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Kids Dingys 72-79 ,Several Windsurfboards 79-86 OK dingy competitions 86-92 , Trotter Pandora Race 92-98, Friendship 28 Sport 98-05, Hanse 370 06-......
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Lippe
Commadore Joined: 05 September 2009 Location: Finland Status: Offline Points: 356 |
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My hoses look good but many of them are hard like stone (ready to crack?). Last week my hoses from engine top to boiler were changed same time with coolant change. Those hoses were also in really inflexible shape. I added also shut valves to both new hoses.
Edited by Lippe - 01 March 2021 at 17:57 |
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Mark_J1
Rear Admiral Joined: 12 March 2013 Location: Dover&Medway UK Status: Offline Points: 526 |
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Good spot all. As we are on a 400 hull #31 it seems a good preventative measure. Also worth mentioning to check the heating duct which typically runs below the CAV filter. It can develop cracks from pressure when removing the filter. Then if you get a drip from the filter it drops straight into your heating duct :-) Especially if you get a small of diesel when running the Webasto. They heating ducts are not robust.
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Hanse 400e "Grey Goose" Hull #31
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