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  • Writer's pictureDave LeGear

Low budget Outboard Pre-Lube Pump (4 Stroke only)

The reason Military and many other Industrial-grade engines last so much longer (other than being built for such and run expensive lube oils) is that they employ Pre-Lube pumps to circulate lube oil throughout the engine before it is lit off / started. One of our long-standing checklist items back when I was in the USCG and yes, this was well past the use of Cannon Balls and Sails for those calling me OLD! LOL... Was to bring online and make sure we had X amount of Oil PSI before the crank was spun over a single degree. So, looking to employ such thinking on our past Yamaha F70 Outboard, especially after an engine oil change... I discovered that "if" I left the red kill safety switch insert disconnected (unlike my past BF150 Honda) I could spin the engine over for some time and it would not start.

Yamaha Outboard start switch

This is great! And though not a true Pre-Lube pump by design..., It does allow one to spin the engine over and allow oil pressure to build up since the oil pump is a mechanical pump, before putting fire to any cylinder. As such, anytime I go to start the engine now... I leave the kill switch disconnected and spin her over for 5 to 10 seconds to build up oil pressure inside the Engine before I reach down and insert it for what I call the final "Light Off" Now will this help any? Well, much better than the engine going from setting (sometimes for days or longer) and starting right up with many components still dry, now under a full load, and getting hot real fast, than no oil at all... Also, a good practice after making an oil change and almost all the new oil is just sitting in the oil pan so you can move that fresh oil all around the engine. I am sure some will say this could be hard on a Starter. If you stayed on the ignition switch for a long period I might agree, and therefore I do it for such a short period. And in the long run, I would much rather swap out a starter than have to rebuild the top end or entire engine any day! Again, you do not need to spin her over for a long period... Now this was tested on my 2013 F70 and my 2022 115 SHO Yamaha and I "suspect" that is the way Yamaha makes all their more recent ignition switches, and it might work the same way for you. Easy enough to test for sure... And it could work for other makes/years of Outboards knowing how they all source many of the same parts from the same vendors. I do know that my past 2004 Honda simply would not even turn over if it was disconnected. Again, easy enough to test if you would like to try this process and if nothing else, to ensure your safety switch is indeed working as designed? I would just make sure; you have water hooked up and flowing through a set of muffs and the prop is clear before trying. Hope this helps extend the life of your Outboard and do let us know your results!

Along these same lines, and to help save on some more wear and tear on your very expensive engines! You may want to read our product coverage on (quite telling) a very efficient way to help save on those engines and afford a great ROI versus repairs or rebuilding one.

Filter Mag

You can read more about them by clicking Here and another follow an article by clicking Here

So, try one and see how much longer your oil stays cleaner. This as those sub-20-micron little particles of metal that are now passing through your oil filter media (which is usually just paper) are getting stopped there. This and not acting like tiny particles of hard metal sand circulating in your expensive engine! I recommend starting your search for one regardless of the application (Marine, Automotive /RV) by first clicking Here

And do let them know that Flats Nation sent you and we have a Promo Code for you to use when ordering! Just use "FlatsNation10" to receive 10% off on your entire order 😊

In the meantime,

We invite you to take in a few Flats Nation Podcast Episodes to help "Scratch that Fishing Itch" when working or traveling and you just cannot hitch up the Skiff and go, on these links:

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Also, The "Flats Nation" Merch and Swag collection has some new works now (just click on each Design or Picture to view that collection) and can be found by clicking Here or just click on our Flag below to take you to that section to land some for yourself and family/friend that enjoy their time here on Flats Nation. 😎

Tight Lines, and God Bless!

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