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Old 16-05-2015, 06:07   #16
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Re: Yanmar 3HM35

Apart from the pistons, camshaft and clutch, is there anything else mechanically connected to the crank?

I once had a Buhk that appeared seized but the real problem was a seized waterpump that was chain driven (internally) and this was preventing the crank from rotating.

If there isn't anything else then prehaps it is time to remove the head

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Old 18-05-2015, 06:55   #17
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Re: Yanmar 3HM35

Originally Posted by Canibul View Post
I've got two of those in our boat. Very interested in your findings on cause of this. How long did the engine sit idle after you last shut it down to repair the manifold?

Did you change anything else other than the new manifold?
only 3-4 weeks

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Old 17-08-2015, 11:28   #18
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Re: Yanmar 3HM35

Originally Posted by Bris4fun View Post
only 3-4 weeks
Experiment just how quick this happens. Take an old worn lawn mower engine and take the head off. Pour a little salt water in the cylinder and come back in 24 hours - WOW.

I would try taking the injectors off and pour some penetrating oil in each of the cylinders and allow to soak for a day or two, then repeat at least once before trying to turn it over. Don't use a bar, or the starter and don't put much force on it, once the oil works, it should not require a lot of force after that point.

Different people have different favorite products to pour down there from ATF mixed with a little gasoline to marvel to PB Blaster, locktite, and even WD40. Does not matter what you use, what matters is you get it all out of the crankcase before starting the engine again.

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