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Old 29-02-2016, 15:31   #31
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Re: Yanmar Gearbox Lube Oil Questions

I have the KM3V, vdrive. The manual states the "fully inserted" sentence and the next sentence states to check the level of the clutch case oil without screwing in the dip stick.

I have the same dipstick shown here, with only the one mark near the tip. Using the drain plug then filling with the right amount of oil results in a level indicated on this single mark.

The reason for this unconventional dip stick is because it serves as the breather as well. In operation the level is below the hollow tubular stick allowing it to breath up to the small hole near the cap. But I have yet to try to figure out how it gets from there to outside the case. But it's what the manual says.
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Old 01-03-2016, 03:18   #32
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Re: Yanmar Gearbox Lube Oil Questions

I would give Marine Power in Burseldon a call. They are the local experts and have always been helpful to answer my naive Yanmar questions.
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Old 01-03-2016, 04:06   #33
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Re: Yanmar Gearbox Lube Oil Questions

Quote:
Originally Posted by Rapanui View Post
I would give Marine Power in Burseldon a call. They are the local experts and have always been helpful to answer my naive Yanmar questions.
That's a good idea. This thread is very old and the question long since answered, but for whoever else might be in this area -- the Marine Power guys (a family business) are very knowledgeable and helpful. I buy all my parts from them, and they have worked on my Yanmar from time to time. They also have an office in Portsmouth or Gosport IIRC.
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Old 01-03-2016, 06:44   #34
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Re: Yanmar Gearbox Lube Oil Questions

Dockhead; yes this thread is old but did you ever get the answer to your original question of using engine oil in the tranny, it never seemed to get answered as the subject of the dipstick took over? Glad to see that I haven't been the only one feeling a bit "stunned" trying to figure the dipstick issue out!!
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Old 01-03-2016, 07:45   #35
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Re: Yanmar Gearbox Lube Oil Questions

My manual (3gm30F) states to check oil level without screwing the dipstick in. When the oil is clean it is hard to see on the dipstick but if you lay the dipstick against a piece of paper towel you can see the level easily. I just use the same oil as in the engine crankcase (Rotella-T 15-40). Have owned the engine since new. Now at 1200 hours, no problems.
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Old 01-03-2016, 09:48   #36
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Re: Yanmar Gearbox Lube Oil Questions

Does anyone know where I can purchase a dipstick for the tranny, I have a yanmar 3gm30f, stock trannny.?
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Old 19-02-2017, 13:13   #37
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Re: Yanmar Gearbox Lube Oil Questions

Dockhead,
I have the same dip stick and tranny that you have. I, too, puzzled over where the oil should appear on the dipstick, and after reading all the replies here and other websites, I concur that 1) Don't screw the plastic top down when checking oil levels, 2) When the oil appears on the tip of the dipstick, stop adding any more oil. The paper towel thing is what I use too.
As for the HD designation and weight of the oil that should be used, I have that same question being submitted this week to a petroleum lab here in Tampa that just tested my tranny oil. When I hear back from them I will post the info. I believe the former owner had used Rotella 15 - 40 for diesel engines in the gearbox as well as the engine.
Also, if you ever want to compare the minerals and viscosity reading at 100'C found in a sample from your gearbox to my recent results let me know. The former owner of this boat bought the Yanmar engine and Kanzaki gearbox in 1998. He put over 6,000 hours on the engine, and I assume that many hours are on the gearbox. The sample I just had analyzed had been after 164 hours of operation.
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Old 20-02-2017, 07:13   #38
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Re: Yanmar Gearbox Lube Oil Questions

Greetings and welcome aboard the CF, Mike.
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