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How to change impeller on 25 hp mercury efi four stroke

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1998 1150412UD Mercury Outboard - is it 2 or 4 stroke


If it has an oil compartment, it has to be a two stroke. There is a rough and ready way to check. A four stroke engine has a compression stroke on every four strokes, whereas a two stroke has compression stroke on EVERY upward stroke of the piston. Remove the spark plugs, and turn the engine until you see the piston. Put your finger over the plug hole and turn the engine one revolution. Do you get compression? Keep turning, do you get suction and then compression again. If so it is a two stroke.

you can also follow the pipes from the oil tank and see where they go to? Yours should have a pipe from the pump to the carburetor inlet manifold.

On a new boat though, my advice for you is to take the boat and engine to a marine engineer for a service. The cost is minimal and you will get everything set up for the season, especially the carbs. You can ask lots of questions. The cost is about $150 and is well worth the piece of mind that you are not going to break down.

The critical bit you have missed from your post is the HP. If you Google

Mercury HP Serials

and you will end up at a site with engine details. Then google the same, but manual instead of serials. If you know the year of the boat, add that before 'Mercury'.

Use Evinrude XD50 two stroke oil. It is expensive but the best in clean running, non fouling and lack of acrid fumes. One $48 jug will last a season and a bit if you go out twice a week as I do. My boat goes to the marina on Wednesday :>)

Google

May 29, 2017 | Mercury Boating

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

It is likely a 4 stroke, but I won't give you a definitive answer, due to the damage it can cause with a guess!

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&*

Mar 07, 2017 | Mercury Boating

1 Answer

My 140 hp mercury outbord will only run if u take 1 spark plug out it does not mater witch plug it is


very unusual problem
need more information before I attempt to answer
is it a 4 stroke or 2 stroke , 4 cylinder in line or v engine
carby or efi --year and model would be a help as well
does it run ok at idle but fail at rpms when you take a plug out it runs well on the remaining cylinders
I have a germ of an idea but I need that information first to see it it is viable
comment , don't post as posts are not linked

Oct 02, 2016 | Mercury Cars & Trucks

1 Answer

I have a 1978 merc 85 hp outboard with a bad pump i purchased a used one that works mine has 4 hoses


Mercury Outboard Fuel Pump - Mercury Outboard Forums

forums.iboats.com/Mercury-Outboards/Fuel-Pump
5, 2004 Mercury 225 four-stroke EFI no power to Low Pressure fuel pump. Why please help · Mercury & Mariner Outboards. 13, Mercury 850 (85hp) - Gas pumps through the top carb - Failed fuel pump? ... 1, 1969 7.5 H.P. Mercury (Bad fuel Pump)? ... 1971 · 1972 · 1973 · 1974 · 1975 · 1976 · 1977 · 1978 · 1979 · 1980 · 1981 ...

Fuel Pump Diaphragm replacement Mercury outboard 110 ...

? 4:18
https://www.youtube.com/watch?v=vufekxTVZd8
Jun 22, 2012 - Uploaded by Brad Clark
My last test run of this motor lead me to believe I had fuel pumpissues...so in ... Mercury 9.8 h.p. 110 Outboard Motor WaterPump Repair and ...

How to remove the lower unit on a Mercury outboard motor ...




Dec 01, 2015 | Boating

1 Answer

I have a 1998 model E25RMECA I NEED TO KNOW WHAT TYPE GAS TO USE IN IT. AND IF IT IS 2 CYCLE OR 4CYCLE.


I found a mixture of sites for the information
one owner of a 1998 25 hp evinrude says that it is a 2 stroke with a fuel mix ratio of 50:1 as 25:1 is a bit smokey
another site says that the recommended octane fuel rating is 87 although it might run better on 91
best advice is to find an evinrude service dealer and get the right information as the later 25 hp units are etec engine which will be 4 strokes

Oct 23, 2015 | Clymer Evinrude/Johnson 5-70 Hp...

1 Answer

What is the shaft length of my 1998 mercury tracker outboard Serial number OG676641


Measure from the cavitation plate (the one above the prop) to the u bend where the motor hangs on the transom. They are usually considered 15", 20", 25".

Nov 02, 2014 | Boating

1 Answer

Engine diagram parts


Have you replaced the impeller in the lower unit recently? If so was it in pieces? I would start there.

Aug 21, 2014 | Clymer Mercury/Mariner 2.5-60 HP...

1 Answer

Impeller replacing on 1999 merc. 25hp 2 stroke


Should not be that hard. Tape up the ends so you can hold it with out getting cut, (if its ragged or sharp from damage). should be one nut holding the impeller on. If its to tight to hold try air or electric Impact wrench. If its bad you can tap with a hammer to help in removing the old one. If it turned on the shaft you will need to rent a puller. Repost if you need more help.

Jul 04, 2009 | 1999 Honda XR 600 R

2 Answers

Need oil change in water


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

Mar 11, 2009 | Light Outboard Motor Boat Bass Fishing...

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