Yamaha Lower Unit Drain Plug Size [Explained Everything]
While changing the oil on your boat’s lower unit, you may need to change the drain plug, too. Because during the lower unit’s oil change, you can go through the issue that the lower plug is not tightened up. So the only option to fix this hitch is to change the plug.
Therefore the most crucial information you need to know is your Yamaha lower unit drain plug size. However, 5/16” or 8mm or 8hp is the Yamaha drain plug size that will fit ideally both in the smaller and larger engines.
Now, in this article, we will explain all the details of this drain plug including its size, use, when and how to replace it, etc. So, sharply read it till the end, and you will surely learn all the details.
Yamaha Lower Unit Drain Plug Size
The lower unit drain plug size is 8mm or 5/16”. However, knowing about the screw/plug size is not enough. You also need to know about the drain plug gasket. The drain plug gasket is useful to seal your Yamaha drain screws.
The Use Of Yamaha Lower Unit Drain Plug
The aluminum bolt lower unit drain plug is especially helpful in mitigating the outboard’s common dissimilar corrosion issue. We recommend you bring the pump kit for your Yamaha to pump in the lower unit oil. Then use the perfect size plug and ensure it fits perfectly to attach the plastic hose.
When & How to Install Yamaha Lower Unit Drain Plug
Different metal shavings and other dust units can constantly come from your Yamaha lower unit, and all the dirt will get stuck in the drain hole. However, in this case, you may need to put in a new plug if the old one becomes bad due to dirt accumulation.
Also, another cause of replacing your Yamaha drain plug is the old plug becomes pretty ragged from the flat head screwdriver’s poorly fitting.
However, before installing your Yamaha drain plug, apply clean oil to the gasket surfaces and screw threads. And then install the lower unit drain plug. Again, ensure the lower unit drain plug is highly compatible or perfect to function during replacement.
Frequently Asked Questions (FAQs)
A leaky seal mainly causes the water in your outboard motor’s lower unit.
Your Yamaha lower unit oil weight is 2.00 Lbs.
Any lubricant brand with the API GL5 SAE 90 or 90 weight grade designation is perfect for an outboard lower unit. However, don’t get a puzzle between different oil weights and brands.
Final Thoughts
Hopefully, the above article was helpful enough. And you get a clear insight into your Yamaha lower unit drain plug size and its other details. As you now know the drain plug’s size, you will not face much problem in changing the deteriorated old plug.
Don’t hesitate to comment if you have any questions about your Yamaha drain plug unit. We will ASAP reply to your query.
You Can Also Read: