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Old 26-07-2017, 14:01   #1
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Yanmar 4jh4-ce corrision

Hello Members, I am looking at purchasing a Lagoon 440 with 4jh4-ce engines with sd 50 sail drives. My questions is should the engines have bubbling paint from the top of the heat exchangers with only 2000 hours as the seller states although the panels have been replaced and the hours are only a guess. Thanks for any help in advance. We have had the surveyor on the boat twice and not able to complete survey do to generator not running,electronics not funtioning and a sail drive issue where we almost hit the bridge do to lack of reverse engagement.
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Old 26-07-2017, 14:37   #2
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Re: Yanmar 4jh4-ce corrision

If there was any water dripped on it the paint will flake eventually. I had a few spots bubble when my engine hatch wasn't sealed and it's only 2 years old. The paint they use is pretty chintsy.

If you want to know the condition, when you take the boat out for sea trial, get an oil sample and pump out a little after it's been under a load or at operating Temps for a few to get a good sample. It will yell you a lot more than someone just looking at it.

Check out Blackstone Labs for sample kits. It's pretty quick and easy process. Nice people on yhe phone too.
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Old 27-07-2017, 00:30   #3
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Re: Yanmar 4jh4-ce corrision

The saildrive issue you had is very common with the Yanmar SD50. Search on here or Google SD50 cone clutch problems and you'll find a lot of info. It's not expensive to fix but it will come back again, always at the most inconvenient moment and usually with very little warning!
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Old 27-07-2017, 01:49   #4
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Re: Yanmar 4jh4-ce corrision

Look's like all good points to get a good deal on the asking price,

1)Bubbling paint on the heat exchangers could also be a sign of previous water pump failure and an over heat situation!
2) Generally these are a reliable engine with few problems, if purchase goes ahead -remove the exhaust risers and check /replace (especially if the engine hours are in question)
3) Oil sampling is a very good idea(as can reveal basic engine condition)
4) Suggest the use of a laser temp gauge around the engine to confirm raw and fresh water operation (this actually reveals a lot of information-surprised your Surveyor didn't do this?)
5) Drives as mentioned in previous posts can have issue's but overall are pretty reliable (cone drives always an issue-but by changing lube type quality have seen some amazing results(but thats another forum)

I offer the forgoing only as advice with no preconception, with no legal implications and without prejudice.

Cheers Steve (MIIMS) Surveyor
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Old 27-07-2017, 06:02   #5
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Re: Yanmar 4jh4-ce corrision

We have the same paint issues on ours, no real issue with it.very tough motors these.
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Old 27-07-2017, 06:44   #6
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Re: Yanmar 4jh4-ce corrision

Oil Analysis may not be all that it's cracked up to be
Oil Analysis .... Worth it ?
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Old 27-07-2017, 08:49   #7
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Re: Yanmar 4jh4-ce corrision

I have run SOAP programs on Army aircraft and even the trucks for decades.
For the trucks that are often used very little it is good to determine when the oil needs changing as it can be years, not months and you save a lot of oil that way.
For the aircraft it was essentially useless even though we pulled samples on all oil lubricated components ever 25 flight hours. In 20 years on fleet sizes of 24 to 36 aircraft, it never, ever once pointed out a failing component that wasn't detected by other means first.

You want to really know what is going on in your engine wear wise? Cut open the oil filter and inspect it for wear metals and carbon, what color is the metal, and will a magnet attract it? Really should be NO metal to speak of unless engine is new or newly overhauled.

But if Spectroscopic Oil Analysis makes you happy, for it to mean anything, you need a baseline established over several analysis, totals are almost irrelevant, what you look for is steadily increasing trends of a particular metal.
Although it can find fuel and water dilution as well as dirty oil like from a bad air filter on a farm tractor, but so can you, without analysis.
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