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Yamaha Outboard Lower Unit Fluid Fill Question/Advice

Old 03-18-2023, 01:35 PM
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Default Yamaha Outboard Lower Unit Fluid Fill Question/Advice

Hi all,
So I changed the lower unit fluid and silly me filled from the upper vent instead of from the bottom. It took the correct amount in total and I didnít rush filling so I believe itís correctly filled and presume since it fully filled with the correct amount and such that it doesnít have an air pocket.
Looking for advice as I know itís not a huge deal to do it again from the bottom but Iíd prefer not to if I donít have to.
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Old 03-18-2023, 03:35 PM
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Why not drain the oil and catch it in a clean container for re-use and put it back in correctly? Then you don't have to wonder the next time you drop the hammer.
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Old 03-18-2023, 03:51 PM
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Originally Posted by DrFeelgood View Post
Why not drain the oil and catch it in a clean container for re-use and put it back in correctly? Then you don't have to wonder the next time you drop the hammer.
Winner winner chicken dinner
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Old 03-18-2023, 05:41 PM
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Thanks, youíre right keep it easy and worry free redo it and reuse it.
Thanks for the advice
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Old 03-23-2023, 11:23 AM
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A little trick to save time and effort. keep the vent closed, open the bottom fill and quickly insert your fill tube, then open the vent. You don't need to drain the whole drive and you will only lose a few drops.
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Old 03-23-2023, 02:02 PM
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Default Thatís the way

Just fill it from the bottom and see if anything seeps out at the top.

No need to drain.
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Old 03-23-2023, 04:04 PM
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Id run it........it will purge any air out then top it off if need be from the upper plug
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Old Yesterday, 09:22 AM
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I appreciate all the advice everyone.
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