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Issue with a 2004 40 hp 4 stroke mercury engine,

Its overheating and we have changed the waterpump and the themorstat and it is still overheating

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Have you checked to see if there are any blockages

Posted on Jul 31, 2009

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Posted on Jan 02, 2017

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Mercury outboard s/n OT603376 Is this a 2 stroke or a 4 stroke motor


Go to MarineParts.com and put in the s/n and they will id the engine hp, stroke and year.

Sep 08, 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

What year is a mercury 35hp outboard motor with serial number2491265.Is the motor 2 or 4 stroke


the serial number begins 2487558 and continues past 2491265 and as the beginning serial number denotes the year , your engine is 1969 model
it shows as a 2 stroke with auto oil injection
check the heads
if the plugs are in the flat of the head and there are no rocker covers it is 2 stroke
talk with a mercury /mariner service center

Sep 25, 2016 | Mercury Mariner Starter, Outboard, 35-40...

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
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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

Are the controls for a 1998 15 HP 2 stroke Mercury outboard compatible with a 2011 30 HP 4 stroke Mercury outboard


If your old engine/control has the same 'options' as the30hp, yes everything is compatible... (Electric start or trim )
The throttle and shift cables are allways compatible...

Jun 25, 2015 | Mercury Marine 15hp & 20hp 4 Stroke...

1 Answer

30 hp 4 stroke carburator problem


Check your "sync n link" of the throttle pick up and the ignition timing.

Aug 05, 2012 | Seloc Mercury Outboard Engine Repair...

1 Answer

My Mercury outboard 135 hp from 1986 jumps from 1000 rpm to 1400 rpm. It is not the spark plugs or ignition spoils (Have disconnected each once at time and there is no difference) The twoo boxes are...


my main suspect here in a case like this is the reed valve ,its sits behind the carb and all 2 stroke engines have one ,if you remove this and its clean and sealing up ok then check the stator under the flywheel ,In the end i gave up with the 2 stroke engine and bought a 4 stroke engine and the amount of fuel i have saved ?? Under the flywheel on the top of the engine is a advance /****** mechanism and this could be sticking or siezed up as well

Jun 21, 2011 | 1995 Mercury Mystique

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