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Post by fish on Nov 16, 2022 10:54:47 GMT 12
A mate of mine is looking at buying a boat. It has a 10yr old Yanmar 80Hp turbo diesel (4JH4TCE) with 5,000 hrs.
The boat has a water maker and air-con, and basically no other source of power generation (has a small solar panel, circa 100w-150w). I suspect the engine has been used extensively at low load for battery charging. Not having had a turbo diesel myself I have limited knowledge in the area. I know that it is not good for diesels to be run without load for extended periods of time, and I know turbos need a good working out. Would extended hours of charging at low load give you cause for concern?
I also know that Yanmar owners bitch non-stop about the extortionate prices for spares and replacements.
The boat was originally in charter, which would go some way to explaining the comparatively high annual engine hours.
What comments does the board have, what to look out for?
How are you supposed to look after turbo's?
Who has them and are you happy / what issues have you had? Fogg?
It also has an SD60 saildrive. Any comments on that? (I am a straight shaft kind of guy, know exactly where I'm at with one of those...)
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Post by ComfortZone on Nov 16, 2022 11:28:20 GMT 12
A mate of mine is looking at buying a boat. It has a 10yr old Yanmar 80Hp turbo diesel (4JH4TCE) with 5,000 hrs. The boat has a water maker and air-con, and basically no other source of power generation (has a small solar panel, circa 100w-150w). I suspect the engine has been used extensively at low load for battery charging. Not having had a turbo diesel myself I have limited knowledge in the area. I know that it is not good for diesels to be run without load for extended periods of time, and I know turbos need a good working out. Would extended hours of charging at low load give you cause for concern? I also know that Yanmar owners bitch non-stop about the extortionate prices for spares and replacements. The boat was originally in charter, which would go some way to explaining the comparatively high annual engine hours. What comments does the board have, what to look out for? How are you supposed to look after turbo's? Who has them and are you happy / what issues have you had? Fogg? It also has an SD60 saildrive. Any comments on that? (I am a straight shaft kind of guy, know exactly where I'm at with one of those...) Turbo's need to be worked hard ie for that motor be operated around the 2,800rpm mark. Oil change frequency needs to be adhered to. Ideally an inspection needs to be carried out with the turbo tested for boost pressure and an engine compression check undertaken to ensure the bores are not polished. Also have a close look at the end caps on the Heat Exchanger for salt water leakage, if this has to be replaced you are talking $5k plus. If the inspection came up ok and the purchase went thru, on those hours I would be removing the turbo, the heat exchanger and after cooler for servicing, and having a close look at the injection elbow which is probably due for replacement. Also change Sail drive Oil and look at changing the hull seal The SD60 sail drives are somewhat better than the SD50's which had all the problems, they are sourced from an Italian OEM who I understand also supply Volvo's saildrives (which have a better reputation than Yanmar"s) |
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Post by fish on Nov 16, 2022 12:20:58 GMT 12
Thanks CZ,
What is the likely outcome if the engine isn't worked hard for long periods? Polished bores and more wear on everything? (everything slopping around not under load?)
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Post by ComfortZone on Nov 16, 2022 13:13:53 GMT 12
Thanks CZ, What is the likely outcome if the engine isn't worked hard for long periods? Polished bores and more wear on everything? (everything slopping around not under load?) excess bore wear usually results in blowing smoke, especially on start up, and burning oil. Long term running under low load can also result in sludge build up in the oil passages due to not properly warming up. That being said I understand that charter boat engines usually stand up pretty well because the charterers are pretty brutal with them when underway and there is nothing a diesel likes more than hard work running at the correct operating temperature. |
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Post by Deleted on Nov 16, 2022 14:10:16 GMT 12
Its probably used 1/2 its life at 5000 hrs,but regular oil/filter changes ,top end tune up and providing its been run hot should be ok.A surveyor should pick it up,might need a marine engine surveyor for peace of mind.
Turbos hate being cold
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Post by Fogg on Nov 16, 2022 15:17:35 GMT 12
5,000 is quite a lot if you don’t know much about how it’s been used. 5,000 is less if you knew it’s been used ‘properly’. Agree it’s charter history might actually work in its favour in this respect.
Fogg was also very lightly used with only 475 hrs in 8yrs. It was a little bit blue at high revs but after a thorough service and a few hours of heavy use that disappeared.
My SD50 caused problems at 500hrs - a well-known issue with clutch cone slippage - but the equally well-known fix resolved that (so far).
SD60s also have had issues but use a different system which doesn’t have cones but is more sensitive to misalignment of the gear selector.
In short, if the rest of the boat ticks all the boxes then the engine shouldn’t be a show-stopper if it passes a thorough mechanical inspection and performs well at sea trial.
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