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Old 16-05-2014, 16:17   #61
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Re: Yanmar Problems

Last post describes it well.

SSCA Forum View topic - Yanmar 4JH valve adjustment (how to turn engine)
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Old 16-05-2014, 18:38   #62
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Re: Yanmar Problems

Good to know about the vacuum gauge that it doesn't detect an air lock. Something else to put in my tool box. Sorry I couldn't be of more assistance
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Old 16-05-2014, 20:30   #63
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Re: Yanmar Problems

Dockhead, what revs do you typically cruise at? Sounds like you may be underloading your engine, which particularly in the case of a turbo motor is not a good idea - they need to work. In the case of your motor the turbo is not doing much until ~2800rpm, below this speed the engine is effectively being somewhat overfuelled by the mechanical injector pump. If you can find the specific fuel consumption curve you will see it is quite steep either side of the best operating range of 2800 - 3200rpm. See the following comments on operating speed
Yanmar Marine Engine Help

You made the comment about your prop not being a concern because the Autoprop is self pitching. However as each model is designed for a range of applications it is posible for them to be effectively over pitched. In the first major test on props by Cruising World quite a few years ago ( Autoprop still use this data in their advertising) the test engine could not reach full revs with the Autoprop, it could only achieve 3100rpm, not 3600 rpm.
If you could find someone who had accurate fuel flow measuring equipment, it would be useful to verify that the prop is allowing the engine to opérate correctly.
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Old 29-05-2014, 13:33   #64
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Re: Yanmar Problems

I have a Yanmar 4JH-HTE with about 3,100 hours when I bought the boat. White smoke was reported in the survey. This engine has a turbo and intercooler. I prefer a naturally aspirated engine so got a mechanic to take out/remove the turbo and intercooler. Turbo was seized and seals were leaking oil into the intercooler. Lucky I don't have to buy these replacements.

Last reading of engine hour was 3,750. Been running engine without the turbo and intercooler. Added engine oil additive NASA (something like STP), I am still having white smoke. Don't notice any increase in oil consumption. Engine always start on the first turn even after leaving it for 3 months.

Dunno what else to do so I am going to leave it alone.
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Old 29-05-2014, 14:00   #65
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Re: Yanmar Problems

Your over fueling the engine. You removed the parts that increased HP by increasing the air flow but left the fuel flow the same. This is not good for the engine. I would recommend returning the engine to it's designed configuration or of your determined to be a NA engine then you need both the NA fuel flow and the proper prop as your now over propped as well as over fueled


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