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Hello: I have a Yamaha 40ETLJ outboard ''1986'' and need a diagram of the lower unit so I can replace oil seals

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: gear box oil leak

Here is a website where a manual for you outboard may be purchased.  Outboard Marine went out of buisness in 2000 and thus no parts of origial manufacture are support is available . Therir are secondary markets .    THe Lower case splits in half and their is a seal around the prop shiftm which is pressed in. The seal between the cases are cut o-rings which are placed and glued into place with gasket seal.
The water pump is located where the case splits a little bit higher. You must open the little port on the side and take out one of the screws to the connecting shift linkage to split the case. After splitting the case the drive shaft and water pickup tube(s) wil come out of the powwer head or the tubs may stick into the power head which is ok. Place the lower skag into a vice and remove the 4 or 5 screws to the water pump housing. Remove and replace impellor and impellor plate if available. If part(pieces) of the rubber impellor is missing flush out the tubes and the power head to remove them.   When reinstalling the lower unit use a flash light to make sure that the tubes return  to the proper place in the power head and the shift lever is resecured. If you need more assistance, just write back. I was an Outboard motor mechanic for five years about the time of your motor.  

Posted on Dec 23, 2008

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SOURCE: Yamaha outboard engine 4LK 6EO l 323627 HOW DO i CHANGE OIL IN

to change fluid,take out the bottom plug;should be a flat head screwdriver fitting place something to catch old fluid under the lower unit,then take out top plug,it should drain right out... then from the bottom... fill the lower unit till fluid starts to come out of the top hole then put bottom plug back in, then top plug back in and your good to go..when you have the plugs out check the seals on the plugs and replace if needed...that will insure no water can get in..as far as the fuel mixture you can google that info

Posted on Jul 26, 2009

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SOURCE: I want to disassemble the lower unit on the 115hp

you actually want gear housing exploded view and/or lower unit mid section exploded veiw-i have the mercury service manual for the inline series 75 thru to 150 2 strokes-but my printer/scanner down at moment -hopefully fixed this week so will be able to scan and send to you

Posted on Oct 15, 2009

  • 10 Answers

SOURCE: fuel oil mixture for 1986 mercury 115

I own a small Mercury outboard so I did alittle reading in the manual and the ratio for your 86' 115 HP is 50-1. Hope it helps. Coach Theune

Posted on Oct 25, 2009

Testimonial: "Thank you coachtheune. I appreciate your help."

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SOURCE: replace water pump impellor 15hp yamaha outboard

Put the motor in neutral.On the leg of the motor there is a little side cover plate.Remove.Undo the bolts.This is the gear change linkage.At the cavitation plate,there is 4 bolts.Remove.If the lower housing does not drop,give it a soft whack with a soft hammer.When dropped,you will see the prop shaft and the gear linkage.Lower it all the way out.Its easy to work on if you put the lower skeg in a vice.Take the water pump apart BUT!!! have a look at which way the impellar blades are pointed.Grease the new impellar as you put it back in and turn it at the same time to get the nodes in properly.Heaps of grease to protect all the bolts.Makes it easier next time.Hope this helps

Posted on Nov 16, 2009

Testimonial: "cheers much appreciated "

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Water in oil in yamaha out board when old oil was drained no sign of water in oil after changing with new oil now water in oil


You need to replace all the lower seals and o-rings to the prop. I am having this done on a 2014 Mercury 60hp under warranty. Just the luck of the draw. I had a 1986 Evinrude for 6 years with no problems.

May 16, 2017 | Yamaha Motorcycles

Tip

Changing oil in lower unit on an outboard motor.


the oil in the lower gear case in a outboard motor should be changed every fall when you take the boat out or once a year if you live where you can boat all year. when you look at the lower unit down by the propeller you will find two screws one lower and one upper. take the upper one out first and check the nylon gasket and replace if worn. put a coffee can or and oil collector under the moter and take out the lower plug. if possible do this after the moter has been run recently, but never run an outboard out of the water unless you have the garden house hooked up to ear muffs over the water intake sites!
the oil will slowly drain out. if the oil looks like chocolate milk it probably has water in it which means its leaking at the upper or lower seals and needs a pressure check and possibly seal replacemant. after all the oil is out (30 minutes or so) its time to refill it. for less than ten bucks you can but a simple device that lets you pump the oil in instead of squezzing it out of the tube. you attach it to the lower drain plug hole and the to a quart of the proper fluid for your motor. make sure you buy the oil to match your type of outboard.
pump the oil or squeze it it from the bottom until it starts to come out the top hole. make sure all the bubbles are out then put the upper plug back in with good gasket, remove the oil tube or appicator from the bottom hole and quickly relace the bottom plug as well with a good gasket.
thats it and you are good to go for the season. if you see oil leaking out the prop shaft or at one of the plugs you need to attend to that soon. tip remember chocolate milk oil or actual water means a seal leak and must be repaired.it may just be a .25 nylon seal for one of the plugs is bad! any unusual noises of difficult or loud shifting can also means problems with the lower unit gears etc and its always cheaper to fix the problem sooner than later.
happy boating!!!!!!!!!!!!

on May 16, 2010 | Boating

2 Answers

How do I winterized a 40hp evenrude 2stroke


There are videos all over YouTube that cover this subject quite nicely.
winterizing an outboard motor YouTube

Nov 15, 2014 | Boating

1 Answer

1988 evinrude outboard


You need to replace the oil seal on the main shaft located below the water pump. Your lower unit gear oil is seeping into the water pump housing. I had the same problem on a Yamaha that I just repaired. Not a hard job. 7_12_2013_1_59_18_pm.png

Jun 17, 2013 | Boating

1 Answer

Lower unit oil


On the lower side of the gearbox,below the line of the prop shaft,you will see a screw that is about10-15mm across.This is the drain for the g/box oil.If you look above that screw about 150mm(6 inches),you will see another screw the same.It may even be marked 'oil level'.Remove them both.
Checked the drained oil is not milky.It's a sign of water and the propshaft seal would need to be replaced.
The oil bottle you buy will have a tapered nozzle.You must fill the g/box from the LOWER hole by sqeezing the bottle.When it comes out of the UPPER hole,the g/box is filled.Quickly put the lower screw back in first,and then the upper screw.Done.
Before you refill the g/box,check the washer/seal on the screws and make sure they are still good. Hope this helps

Jul 09, 2010 | Boating

2 Answers

All the gear lube on my bravo III leaked out. The oil came out where the prop and the lower unit meet.


we had replaced the engine in our 87 4.3 star craft and when we put the omc cobra stern drive back in we now dont have foward gear, we have nuetral and reverse. could it be the linkage or could it be the shifter cable or any other idea's that could be the problem.

Nov 09, 2009 | Garmin Boating

3 Answers

Gear box oil leak


Here is a website where a manual for you outboard may be purchased.  Outboard Marine went out of buisness in 2000 and thus no parts of origial manufacture are support is available . Therir are secondary markets .    THe Lower case splits in half and their is a seal around the prop shiftm which is pressed in. The seal between the cases are cut o-rings which are placed and glued into place with gasket seal.
The water pump is located where the case splits a little bit higher. You must open the little port on the side and take out one of the screws to the connecting shift linkage to split the case. After splitting the case the drive shaft and water pickup tube(s) wil come out of the powwer head or the tubs may stick into the power head which is ok. Place the lower skag into a vice and remove the 4 or 5 screws to the water pump housing. Remove and replace impellor and impellor plate if available. If part(pieces) of the rubber impellor is missing flush out the tubes and the power head to remove them.   When reinstalling the lower unit use a flash light to make sure that the tubes return  to the proper place in the power head and the shift lever is resecured. If you need more assistance, just write back. I was an Outboard motor mechanic for five years about the time of your motor.  

Dec 23, 2008 | Boating

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