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Old 10-09-2015, 16:27   #1
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Yanmar 4JH57

I need some help to ask Yanmar some smart questions about my 4JH57 Common Rail engines.


My Leopard 48 cat is being from Cape Town as I type. About 2/3s of the way into the +6000 nm delivery, the crew had to stop and get a Yanmar tech to look at the engines. Apparently the engines were cutting out every 40 -120 minutes. Engine temperature was fine and no sign of water in the fuel. Yanmar put some new fuel filters on and everything seems to be fine and the boat has left port and is on her way for the final stretch. Arrival is expected to be September 22.


I have not had the opportunity to speak directly with the delivery crew but am surprised that they would not have spare fuel filters on board for a +two month trip. So I am worried this is not just a problem about the fuel filters. More importantly I am worried that in the run-up to bringing the boat into port for repairs, would there have been any more serious damage done. Fortunately, the next two weeks will be a good test for that question.


I have read a lot about the fragility of common rail engines and fuel filtering. If the filters were the only problem, is there any risk that water or sentiment could have gotten past clogged filters and done more damage?


The engines will have a 2 year or 2000 hour warranty once the boat is signed over to me in a few weeks. But I'd like to make sure I really understand the problem experienced and implications for the engines now and down the road.


So if any mechanically minded owners out there can share some questions you think I should be asking Yanmar, please send them.


Thanks very much,


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Old 10-09-2015, 21:09   #2
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Re: Yanmar 4JH57

The Yanmar techs that worked on the repair should of advised specifically what the problem was? It could be a mirage of things, you need a report from them.


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Old 10-09-2015, 21:50   #3
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Re: Yanmar 4JH57

I would think that you should contact Robertson and Caine. Aren't they the ones that are responsible for the yacht delivery? I would ask for a detailed report on what exactly the engine issue was and what was done to complete the repair.

Fishing in CF for impossible answers isn't going to help you.
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Old 29-10-2015, 17:35   #4
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Re: Yanmar 4JH57

up

what happens at the end?

thinking about my nex boat...4jh57 common rail or 4JH5mechanical 53hp..

do you think is quite silence engine? what about fuel consumption?


do you have a specsheet that show the gr/kw hour? i can't find on any website..

p.s. compared right now with the nanni diesel n4.50...the nanni is indirect injection..more efficient on every rpm...
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Old 29-10-2015, 18:11   #5
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Re: Yanmar 4JH57

I know a little about common rails, the major advantages of common rail is that it's dead easy to change injection timing and pulse width, plus you can do some slick things when you control injection with electronics, like a little shot of fuel just prior to the main injection event so the flame front is already established when the main fuel shot get there, so the Diesel "knock" is almost eliminated, very fine control of injection can be achieved.
Fuel sensitivity come from extremely high fuel pressures, and very tiny holes in the injectors the fuel flows though.
Parts cost alone to change the injectors in my Duramax Diesel was around $3,500 I think.
Common rails are usually Direct injection Diesels although they may be IDI and inject in a pre-combustion chamber also, could be either.
I seriously doubt your engines have been hurt, my 2001 truck is common rail, it's no longer new tech and the problems are mostly solved I'm sure.
The things that are possible with common rails are amazing compared to old mechanical injection.


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Old 29-10-2015, 18:55   #6
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Re: Yanmar 4JH57

Still not resolved. Yanmar Malaysia "fixed" the problem with new fuel filters. 100 miles out after that and engine started to cut out again and remained that way for remaining 1500 miles to Hong Kong.

Yanmar Hong Kong has said its a fuel delivery problem but says it's not a problem with engine so not their responsibility. So trying to get someone to accept responsibility still. Disappointed that yanmar did not do a electronic diagnosis of engine. Been told that should have happened. But local yanmar agent just said they think their is air getting into fuel and walked away. No further follow up. So now asking builder in South Africa if there might have been problems with installation.

On a related note my old boat (L46) had the 54 hp model with Bruntons folding props. New engine has same props. But I've noticed the new boat has much less "bite" then the old one when motoring. Especially in reverse. Different hulls obviously. But the difference is obvious.

Regarding noise, a bit quieter but not materially.

I have not had a chance to run the boat enough to comment on fuel consumption. But at the same rpm, the yanmar spec sheets indicate the old 54 hp model is more fuel efficient. But you get higher torque at lower rpm with new engine so some trade off. New engine does have nice instrumentation to provide data about actual fuel consumption in litres per hour.



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Old 29-10-2015, 19:07   #7
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Re: Yanmar 4JH57

Quote:
Originally Posted by HKTim View Post
Still not resolved. Yanmar Malaysia "fixed" the problem with new fuel filters. 100 miles out after that and engine started to cut out again and remained that way for remaining 1500 miles to Hong Kong.

Yanmar Hong Kong has said its a fuel delivery problem but says it's not a problem with engine so not their responsibility. So trying to get someone to accept responsibility still. Disappointed that yanmar did not do a electronic diagnosis of engine. Been told that should have happened. But local yanmar agent just said they think their is air getting into fuel and walked away. No further follow up. So now asking builder in South Africa if there might have been problems with installation.

On a related note my old boat (L46) had the 54 hp model with Bruntons folding props. New engine has same props. But I've noticed the new boat has much less "bite" then the old one when motoring. Especially in reverse. Different hulls obviously. But the difference is obvious.

Regarding noise, a bit quieter but not materially.

I have not had a chance to run the boat enough to comment on fuel consumption. But at the same rpm, the yanmar spec sheets indicate the old 54 hp model is more fuel efficient. But you get higher torque at lower rpm with new engine so some trade off. New engine does have nice instrumentation to provide data about actual fuel consumption in litres per hour.



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wait do you have bruntons autoprop with 57 hp yanmar?

if yes please tell me diameter? how much did u payed it? boat length, weight, gearbox ratio...and fuel consumption at cruise speed

and nothing else
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Old 29-10-2015, 19:10   #8
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Re: Yanmar 4JH57

The boat I have now is a leopard 48. The previous was a leopard 46. Both have same folding props from Bruntons. Don't have all the tech specs on hand though.

Boat is still being commissioned so I've not had her out to actually provide info about fuel consumption.


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Old 30-10-2015, 06:41   #9
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Re: Yanmar 4JH57

Thanks np��
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Old 06-11-2015, 07:32   #10
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Re: Yanmar 4JH57

Finally had a chance to take the boat out and push the engines a bit. Max RPM is 3000 on this engine. After 5 minutes at 2500 rpm, the temperature alarm went off on the port engine. Temperature was 95 degrees C. Starboard was 91 degrees C. Engine had been serviced a few hours earlier. So plenty of coolant and water flowed fine at exhaust. Had yanmar tech onboard. He said he's seen it before and believes it can be fixed with a "wire". Not at all sure what that means. He was going to discuss with yanmar first and get back to me. He also thinks there is still air getting into fuel system.

On a side note i asked yanmar if it would be okay to add startron fuel tank cleaner to my tanks. He said don't use it. Injectors are too sensitive. So not sure if there is anything I'll be able to add to my tanks to control bug growth now.


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Old 06-11-2015, 08:54   #11
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Re: Yanmar 4JH57

I would definitely use a bio-cide in my Diesel, to not use it is foolish in my opinion.
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Old 06-11-2015, 09:44   #12
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Re: Yanmar 4JH57

Most fuel docks in my area sell diesel with biocides already blended in the fuel. I've not had any growth in my tanks in the 16 years I've owned this boat. Have I just been lucky? Should I add additional biocide?


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