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Motor Boat Forum

Mercruiser 3 ltr Oil fill point

by Bigplumbs » 06 Feb 2016, 10:39

Nothing is simple these days. I was about to do the oil change in the main engine and now I am confused. older engines seem to fill the oil in the same place as a car on the top of the rocker cover, mine has a plastic reservoir on the right of the engine like you get with the easy drain system. Min only seems to have half of the easy drain system so I am wondering if this is where you fill the oil.

The pics below show show my engine (the dark pic) and an internet pic.

So simple question is where do I pour in the oil

Dennis
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Bigplumbs
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by annageek » 06 Feb 2016, 10:48

It looks like you have exactly the same generation of Merc 3.0 as us.

Ours has the fill point on the rocker cover, near where the translucent yellow fuel pump sight tube crosses. The plastic recevoir (if I've understood your question correctly) is the sterndrive oil header tank.
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by Bigplumbs » 06 Feb 2016, 10:55

Me thinks I have answered my own question. That little bottle is the stern drive oil reservoir

Fill for main engine is the low cap on the rocker cover as I first thought

I am learning

Dennis
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by betty boop » 08 Feb 2016, 09:19

Bigplumbs wrote:Me thinks I have answered my own question. That little bottle is the stern drive oil reservoir

Fill for main engine is the low cap on the rocker cover as I first thought

I am learning

Dennis



you're spot on :-) one the Gen2 drives have the reservoir bottle, my understanding is it is was put there more to see if the stern drive oil is leaking more than keep it topped up.
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