Question about Light Outboard Motor Boat Bass Fishing Saltwater Base

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Need oil change in water

I have a Mercury 90 HP outboard engine. I need to change the oil and filter but cannot take the boat out of the water. What is the best way to do this?

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If its a 2 stroke, there is no oil to change, if its a 4 stroke, you can pump the oil out with a small diameter tube pump.Depending on the motor, you can get it through the dipstick or the fill opening. If you need to change the gear oil, there is no way to change it while in the water. Stop by a marine supply store and get some oil absorbsion pads (diapers) in case you happen to spill any oil into the water

Posted on Apr 14, 2009

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Turn The Boat Around So That The Engine is Nea The BankrUn Bolt The Gear Box From The Engine On The Bank,
Change The Impeller On Dry Land Replace Gear Oil and Re Fit
The Gear Box.
The Engine Does Not Have Oil Change Unless It Is A Four Stroke.
If It Is The Drain Plug Is On The Side Of The Mid Section And Can Be Drained With Leg Trimmed Up About Half Way
Sorry This Is Best Way.

Posted on Mar 17, 2013

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Posted on Jan 02, 2017

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1 Answer

I have a 20 hp mercury outboard serial#06082001.I want to know what year it is and if it's 2 or 4 stroke


If you drop the first zero it would put it at 1981.

http://www.themarinedoctor.com/msn.pdf

this site gives a different answer, as 1980- 81, so close. It SUGGESTS it is a 4 stroke engine.

http://www.boats.net/parts/search/Merc2/Mercury/25%20%282%20CYL.%29%282-STROKE%29%28International%29/parts.html

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A four stroke running with two stroke oil will just smoke, but a two stroke with no oil will seize and leave you stranded on the water with a seized engine!

A four stroke engine has valves operated by push rods or a pulley and a chain, a two stroke just has a head. Take a look at the engine and it should be obvious.

For your first service, I would suggest you go to a marine engineer. Ask all the questions, and get the right answers. When I had my 1986 Evinrude serviced, i typed a list of questions and left the list with him. i asked him when I picked up the boat and wrote the answers down. The first one was 'petrol to oil ratio and which is the best oil'. A basic service will cost you a hundred bucks and you will have some comfort that you are unlikely to break down, 6 miles offshore with only a paddle :)

https://www.google.ca/search?q=20+hp+mercury+outboard+serial%2306082001&ie=utf-8&oe=utf-8&gws_rd=cr&ei=uwm-WKjHK6SUjwSApJLQBw#q=mercury+outboard+serial+number+lookup&*

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Kevin,
Here you go. This is for the 90-115-140 hp models 1980 (ser# 5594657) and up years.

maxrules.com/oldmercs/Wiring/1966ona/37.pdf

Hope this helps get you back on the water. Happy boating.

Fred-

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