bitwaffle
06.05.2021 3:11:03
If the drain plug has a flat surface on it you use the white nylon gasket. If it has a gruve for an oring you must use an oring. Don't use the white nylon one on the plug that has the gruve for the oring.
See full version: Lower unit drain plug gasket
If the drain plug has a flat surface on it you use the white nylon gasket. If it has a gruve for an oring you must use an oring. Don't use the white nylon one on the plug that has the gruve for the oring.
This topic prompted me to take a closer look at my 1957 3hp Lightwin 3022. The plugs are grooved for o-rings. My local Evinrude dealer said the o-ring plugs are not a good design as the shoulder of the plug can keep the o-ring from being fully compressed if the o-ring is worn or deteriorated. I bought 2 modern plugs with nylon washers. Hopefully, this explains why I had some milky LU lube as the o-rings were very flat. If not, I will need to replace the seals.
Re: lower unit drain plug gasket??
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Yes, the model is NSF15C. Sorry, will remember to include that in the future. I can only guess that the drain plugs are original and of the correct size, I guess I could order 2 more and replace the existing ones. I got distortion from the top plug and not on on the bottom one. While I was waiting for someone to reply to my post I reached out to a Nissan/Tohatsu service center. The tech replied back that after looking in his manual that the proper torque value for the drain screws looks to be 10ft. lbs. I don't know what that kind of torque feels like (I have a history of over-tightening) so in addition to 2 new drain screws I'll be on the hunt for a torque screwdriver.
What is the desired tightening force required on these units? It seemed disconcerting that minimal torque would achieve a positive seal, hence my deferral to the experts. more
I recently acquired a 2009 15 hp 4 stroke Nissan Marine outboard that had very little hours on it and consequently had absolutely no preventative maintenance done to it. I got a hold of some OEM Tohatsu drain plug gaskets (332-6000060M) and commenced to begin changing out the lower unit lube on it. Upon tightening the drain screws I cranked down on them as per usual and noticed that the washer distorted itself and left a questionable seal. I tried another gasket from the same pack and with the same torque got the same results. I ended up putting the old gasket back on it to preserve the fluid fill. more
FYI, The old gasket was bigger and its physical make-up differs from the new one in that the new one appears to be all rubber and the old had some metal backing to it. I ordered the new gaskets using the information from the Nissan Marine Parts List manual. Any help would be greatly appreciated. [links]
I've changed out the lower unit lube on a Johnson and on a Force motor. Each had a different type gasket. I've included a pic of the gaskets off the Nissan for a side by side comparison.