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Outboard marine engine Yamaha 4-stroke , water is mixingwith engine oil .not the poerhead or power head gasket we replaced and tested . any other ideas?

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  • 236 Answers

Cracked block?

Posted on Jul 09, 2019

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6 Suggested Answers

6ya6ya

6ya staff

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: what is the correct fuel/oil mix for evinrude 4hp ?

the proper mix is 50 to 1 or 16 oz to every 6 gallons,in my little boat I put 4 quarts in the 48 gal tank and its been running for 22 years,your running way to rich and your plug is probaly fouled,take it out clean it up/dump your fuel and mix it right,thats a great motor you got,I hunted with it for years,oh yeah when you get started run it till all the smoke is gone or you will have carb problems ,if you dont have them all ready,a little carb cleaner wont hurt but get it running first,or all that trash will foul you out,have a great trip bartriley1

Posted on Jan 05, 2009

Anonymous

  • 10 Answers

SOURCE: Oil leaking into coolant -- not head gasket

check the transmission condenser or oil cooler built in the radiator..

Posted on May 28, 2009

alicantecoli

Colin Stickland

  • 22485 Answers

SOURCE: 40 hp mariner outboard 2 stroke oil leak at

without seeing it in front of me its difficult to advise,i had a mercury but it wasnt oil injection so i iam not sure exactly how this injection system works but i should imagine its nothing more than a O ring thats perished or a copper washer needs cleaning with some wet and dry.I bought a new 4stroke mercury in the end because i got fed up with fuel consumption from the 80hp two stroke ,this four stroke 50hp will do about 12 14 nautical miles to roughly 6/7 litres of petrol at about 1200 rpm because iam only a sunday driver and the bumping on the waves makes my back ache unbearable,Well this is the land of fiesta /siesta /manaña --spain .Have a closer look and see where its leaking its only a mechanical pump running off the engine ,so it will have a push rod with some sort of diaphragm that pumps a tinysquirt of oil into the crankcase so it can mix with the incoming fuel ,nothing complicated

Posted on Sep 17, 2009

Anonymous

  • 18 Answers

SOURCE: yamaha outboard starting

New plugs and service

Posted on Sep 21, 2009

stampservice

  • 1 Answer

SOURCE: Looking for a gasket set for my 1988

top gasket kit pt. no. 3L663D

Posted on Jan 14, 2011

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1 Answer

Have low compression on top cylinder of 06 Optimax 75hp


if this an outboard
4 stroke --valve clearance, burnt valve , head gasket, rings
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compression testing should be done dry and then wet( several pumps from an oil can to seal off the rings during the test)
no difference indicates bad rings or valve, head gasket
an increase in readings indicates bad rings

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1 Answer

Looking for a 2016 tracker targa V 18 combo with a 150 HP murcury 4 stroke outboard engine owners manual


Manual is in the first link

Mercury 150 FourStroke Manual

https://dmna.ny.gov/nynm/manuals/Mercury_150_FourStroke_Manual.pdf
RCD-H-2 Rev 4. 150 HP 4-stroke (3.0L) hp. OP401000 or. 1B227000. RCD-H-2 Rev 4. Essential requirements. Standards. Other normative document/ method ... Owner's manual. This declaration of conformity is issued under the sole responsibility of the manufacturer. I declare on behalf of the engine manufacturer that the ...

Owner's Resources ' Mercury Marine

https://www.mercurymarine.com/en/au/service-and-support/owners-resources/ The major consideration in preparing your outboard for storage is to protect it from rust, corrosion and damage caused by freezing of trapped water. Outboard Storage tips ... Mercury Authorised Dealers have the expertise and training to handle all of your engine maintenance service and needs. Engine Maintenance.

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150 HP Mercury 4 stroke outboard engine owners manual Google Search

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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

Water got into the engine oil of my 8 hp 4 stroke when on the boat only as troller


Water gets in your engine through the exhaust with the boat speed! Lift that engine when not in use!

Oct 16, 2014 | Mercury Marine 8hp & 9.9hp 4 Stroke...

1 Answer

How do i set timing on a 1996 mariner 40 hp 4 cylinder 2 stroke outboard?


timing marks on flywheel and a pointer above the carbs , under the flywheel there is an adjustable rod from the trigger to the throttle linkage ! strobe light required , cant remember timing off top of my head as out so google it !

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1 Answer

1982 55 yamaha outboard ,water not coming out the water pump hole in strenght


First thing to check: Disconnect the tiny hose between the check outlet and the engine. Disconnect it at the engine side.
With an airgun, blow in the check hole from outside to engine side.
With an airgun, blow out the engine connection.
Start the engine, check waterflow out of the engine connector. If water, reconnect the hose and check the water at the checkpoint.
If still no water at the engine connection: replace the impeller!

Mar 28, 2013 | Clymer Marine Maintenance and Repair...

1 Answer

Water flow


you will have to strip the bottom end and renew the water pump impeller ,not a easy job if the bolts have corroded up with the sea water ,soak then in engine oil for a day or so before you try

Dec 17, 2011 | Clymer Marine Maintenance and Repair...

1 Answer

My Yamaha 4 stroke 50hp engine was running fine. When i went to replace the cover, the water stopped running through the "pee" hole.


i have had this on mine and it was a sort of insect that made a mud nest in the small hole and it blocked the hole up ,try poking it out with a bit of wire

Jun 24, 2011 | Clymer Marine Maintenance and Repair...

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