Yanmar Oil leak on 4JH4

Hi, tbbmarine,

I do not really understand what you want to know since almost everything has been set out above. I also do not really understand the word "mating".

But anyway, the engine and the saildrive are two separate elements but connected to eachother. From the flywheel an axis comes out of the flywheel house which runs into the SD. The flywheel is dry, meaning that there will be no oil leaking from that site, assuming that it is leaking just a bit. So, mostly the oil comes from the SD which is totalay filled with oil. To prevent oil comming out, the axis from the flywheel is covered with a seal. Now that one can leak which is a common problem at Yanmar.

If that is the case, you can feel the oil comming down between the engine and the saildrive, just put your fingers in. If you feel the oil overthere, smell it and have a look at its color. Take out the oillevel plug from the SD and smell if its the same particular smell. That should point you in the right direction. If that is not really the case or only half the case, take a look at the color. Especially if the engine oil is gray or black and you can find that color also on your fingers, then it comes from the engine.

If it is the saildrive, be happy to know that Hanse and Yanmar did a good design job: its quite easy to pull the engine from the SD and replace the sealing.

If it is something else , you have to locate the leakage more in detail.

In any event, I have been told that Yanmars are clean and dry during there lifetime.

Good luck, hope it clearify's something, Greetings, Willem

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