Changing lower unit gear oil?

ok so I just bought my first boat a week ago and want to make sure I know how to get it ready for winter before its time for her winter slumber. so this is one of the things I need to do to get it ready





I have a 1986 75hp Jonson out board





I have looked it up on the internet and it looks simple just have a couple questions





is the fitting that comes on the pump to pump the new oil in the same size or do i need a special size for a Jonson





what oil do I use (is there like a certain weight I should use) if you dont know where would I look





and correct me if im wrong don't you just take out the 2 plugs let the oil come out. pump the oil in until fluid comes out the top hole. put the cap on the top hole take pump hose out and put the plug back inChanging lower unit gear oil?
If it is an electric shift it needs OMC electric shift gear oil, and if it's a standard shift it needs the normal lower unit gear oil. When you drain it, If it comes out looking milky then you have water in it. It needs to be checked out by a mechanic pretty soon because if there is water in it the gear case will freeze up and bust in winter weather especially if it gets really cold. But, you CAN refill it with fresh gear oil and wait until spring before taking it to a mechanic, but you need to have it checked before it goes in the water to prevent any problem.


Your procedure for refilling it is correct and the process of fogging the engine is the best way to winterize it. You can get the fogging oil from a dealer. Get the gear oil at any dealer or at any NAPA auto parts store. Last thing before you take it out of the water while the engine is running, disconnect the fuel line from the engine and just let it run till it runs out of gas.


It's not advised to use the 80-90 from your truck but it would do in a pinch. Also, make sure the battery is fully charged before storing the boat.Changing lower unit gear oil?
%26lt;%26lt;%26lt;is the fitting that comes on the pump to pump the new oil in the same size or do i need a special size for a Jonson%26gt;%26gt;%26gt;





It should screw right in, never had a problem with any of my boats








%26lt;%26lt;%26lt;and correct me if im wrong don't you just take out the 2 plugs let the oil come out. pump the oil in until fluid comes out the top hole. put the cap on the top hole take pump hose out and put the plug back in%26gt;%26gt;%26gt;





That's exactly right.
The thread size is standard for most outboards. and yes you remove both plugs to drain. However if the oil is milky or water runs out, you need to get it serviced right away. Refill with oil until you can get it serviced. I strongly recommend you use OMC gear lube. The standard 80-90 gear lube is a bit heavy....... West marine and other marine stores have either OMC or Quicksilver oil. In Winterization it's more important to ';fog'; the running engine, and burn off or drain all the fuel before storage. This is a change from years past. a dry tank is preferred. Good Luck.