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Old 27-12-2011, 04:08   #1
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Changing Marine Gear Lube Oil on Yanmar 4JH

Coming up to about 3 years owning my used boat. It has a Yanmar 4JH-TE with a KBW20 or KBW21 transmission. I was thinking about changing the marine gear lube oil. Looks like I should be using ATF fluid.

I can't really find any documentation on how to change the fluid. Is there a drain plug at the bottom of the transmission? Is it as simple as opening it, letting the fluid drain and replacing? Or do I need to pump it out through the dip stick, then replace? Is there a way to clean out the old fluid before adding new fluid?

Thanks for your help!
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Old 27-12-2011, 04:44   #2
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Re: Changing Marine Gear Lube Oil on Yanmar 4JH

I pump mine from the dipstick hole and have never had a problem. You will leave a few ounces of fluid but unless you have contaminated oil that isn't an issue. Make very sure that you get everything you can by moving the tube around and then make sure you add the correct amt of oil.
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Old 27-12-2011, 07:35   #3
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Re: Changing Marine Gear Lube Oil on Yanmar 4JH

Ditto. pump out thru the dipstick. Run everything first to heat it up so it will flow easier.
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Old 30-12-2011, 18:14   #4
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Re: Changing Marine Gear Lube Oil on Yanmar 4JH

Thanks for the tips. I will give it a try.
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