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post #1 of 15 Old 03-25-2009 Thread Starter
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Transmission Maintenance?

Dumb question but how often should you change the transmission oil?

I have a 83' 32 Morgan with a 23hp Yanmar 3GMD. I bough the boat last year and the previous owner took very good care and I would like to do the same. I change the engine oil twice a season but never really think about the tranny oil.

Also what type of oil or fluid would I use? Is there any other preventative maintenance I need to do on the tranny besides lubing and checking the cables?
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post #2 of 15 Old 03-25-2009
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best bet is not to assume you have the correct or original tranny, whatever that was, and to see what tranny you have. Then find out what oil it needs.

The spec has probably changed since 1983, don't be surprised if the original fluid is obsolete and there's some new replacement for it.
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post #3 of 15 Old 03-25-2009
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Originally Posted by nk235 View Post
Dumb question but how often should you change the transmission oil?

Mine is changed yearly. It's easy and cheap to do. Transmission on the other hand are not cheap..

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post #4 of 15 Old 03-25-2009 Thread Starter
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Do different manufacturers take different types of oil? Also this is really dumb but is there oil and fluid or is it the same thing. Also where would you purchase this? West Marine? Thx

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It depends on

It all depends on your tranny. Most Hurth/ZF boxes take ATF and many of the Kanzaki transmissions on Yanmars take ATF as well but then some take regular motor oil.

You need to ascertain the correct fluid for your particulr transmission on an individual basis.

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post #6 of 15 Old 03-25-2009
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just posted a similar question: is all ATF the same?
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post #7 of 15 Old 04-04-2009 Thread Starter
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Ok quick revival of this. Found out the transmission I have is a Yanmar KM3A and the manual I found says to put same oil as engine. I am using Rotella T 15w-40. Is this ok or should I go with 30w?
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Does your manual say to use straight 30 oil in the engine? Or that a range of mutli-vis oils are OK by temperature?

AFAIK transmissions that use engine oil usually use the straight 30, not the multi-vis, but Yanmar might be more liberal. Why not ask them directly to be sure?
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post #9 of 15 Old 04-05-2009 Thread Starter
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Thanks for the suggestion.

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post #10 of 15 Old 04-12-2009
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KM3A transmission

You may find that the manual and the workshop manual are conflicting one calls for automatic tranny fluid and the other regular engine oil for the KM3A transmission.

The requirement is for 20 or 30 weight motor oil not multi-weight (ie. 5w30) and not synthetic oil

You will find this info on the identifier plate on the top of the gearbox of the transmission, I suggest that you believe this before any dealer's advice or any printed material.
Assume that since it is carved in steel and an attached part of the transmission case, it is as good as "carved in stone"

With normal use you should change the oil annually as the manual suggests, It should take .3 of a litre, don;t overfill, check levels with the dipstick not screwed in but just sitting on the top of the hole unlike the way that engine oil is checked ( with the dipstick pushed all of the way in)
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