See full version: Size of lower unit oil drain/fill hole
I'll take the plug along and the pump I have and stop by a auto parts to see if they have an adapter, both diameter and thread as the Yamaha must be metric - From the little I have learned there are only a few engines that don't meet USA standard drain hole size, even other Japanese engines. here
The answer is Yamaha, and a few others, use a difference size. Walmart, don't know but yes on Amazon
Amazon.com: Shoreline Marine Pump Lower Unit Fill: Sports & Outdoors
Thanks, but I don't recall any West Marine outlets in my area of NJ. Is it a chain - your profile doesn't say where you live, which may be where the West Marine is. here
Thanks, I stopped by Walmart this morning, they had a Attwood Brand (Walmart brand?) package that looked a twin of the Shoreline brand at Amazon, at at a little less money, $6.98. I cut just the metal adapter out and used it on my existing pump, saving the new pump for a backup. [links]
Re: size of lower unit oil drain/fill hole
I am going to attempt to change my the oil in my lower unit. Looks simple enough from online searches and youtube videos. My motor is a 2006 Yamaha 90hp 2 stroke. I bought a Quicksilver Gear Lube Pump to pump the oil into my lower unit. My question is, does anybody know the size of the drain hole for my engine? Looked in my owner's manual, and even online, but could not find the diameter. The pump says it will fit a 3/8"-16 drain screw. It will also fit Yamaha 8hp and larger engines. However, I will need an adaptor for gear cases with a metric drain plug. Just want to make sure this will fit before I drain out the oil and have no way of filling it back up. Thanks in advance. here
"There is never just one thing wrong with a boat"
--- Travis McGee
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I second/third/fourth the suggestion to suction the oil from the oil pan. In less time than you can remove the drain plug you can vacuum the oil out. more
I NEVER EVER remove the plug unless I am removing the oil pan from the upper casing.
and then only on models that its mandatory. here
Would like to know thread size in order to find a fitting to attach a hose for oil changes.
Speaking of drain plugs, how do you feel about F150 balancers? I think that you have an F150. Have you ever replaced your balancer assembly?
You know how aluminum is. It likes to fatigue and fracture. Not a lot of fatigue strength in the stuff. I am guessing that over a number of tightening cycles (maybe to the point of "let's just snug it down a bit more to be sure it does not loosen") the threads simply fatigue to the point that one day they crack and then are prone to letting go. [links]
There's VERY LITTLE aluminum(maybe 1/16" thick) there so I use RED LOCKTITE when installing them.
And I imagine you have no plans to ever remove the plug; have either already brought home or at least ordered, a vacuum oil changer.
*Just a side note, as thin as that aluminum is, once the insert is in, the steel threads are extremely strong.. more
Also on pulling the tang outward.