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Old 09-05-2020, 23:29   #16
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

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Originally Posted by dennismenace111 View Post
Did yiu remove the bolt that runs through the trim tab? That little fun on the bottom of the lower unit!

There is no bolt as far as I can see???
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Old 09-05-2020, 23:29   #17
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

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Originally Posted by Library70 View Post
Had the same problem with a 4hp Evinrude last week. The drive shaft was frozen to the crankshaft at the spline, it did not give up easily!



How did you get it out? I have tried WD40 and a gentle Mallet, but to no effect
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Old 09-05-2020, 23:40   #18
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

I have attached some more pics.


Tried spinning prop in and out of gear, WD40 and a Mallet (gentle) - Its not moving at all.


Also one of the pics I've outlined in Red some bolts which are on both sides higher up near the engine - What are these for?
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Old 10-05-2020, 05:07   #19
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

The drive shaft spline is just stuck in the crankshaft. The 2 bolts at the top are irrelevant.

As previously advised, turn the thing upside down and try and get some oil to run down the drive shaft and into the spline/crank interface. Give it some time to penetrate in (30 minutes - an hour). WD40's not too good for this but is better than nothing.

After a bit, turn it back over (if you want; if it's easier to work on inverted that's okay too), take four thin strips (about 1" x 8" x about 1/8" thick) of the hardest wood you can find, insert them fore and aft in the gap in the lower unit and midsection, and simultaneously drive some appropriately-sized hardwood wedges between the strips. This should separate the two assemblies.

'Gentleness' is not likely to get the job done here, a firm hand is required. When you put it back together, assemble the spline with some kind of heavy grease.


If you're not particularly worried about the paint job, a couple of flat bars will serve the same purpose...
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Old 11-05-2020, 08:29   #20
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

on the shift rod, make sure you totally remove the bolt not just loosening the nut. the bolt itself fits in a groove as I recall that will hold the unit together even with the nut off the coupler unless you remove the bolt-- at least that ios the way it was on my Evinrude.
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Old 11-05-2020, 09:09   #21
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

Before I got too aggressive with it, I’d call a dealer. Other than stuck in the power head I don’t have another suggestion, but assuming it dropped the inch pretty easily and then suddenly stopped makes me think something else may be holding it.
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Old 11-05-2020, 09:11   #22
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

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Originally Posted by UFO View Post
There is no bolt as far as I can see???
That bolt was there on my Mercury Verado, and took me a while figure it out as it’s hidden under the tab, but when that bolt is present the foot won’t drop at all, not even a tiny bit cause the bolt is tight. And your is dropped an inch or so, so I don’t believe there is another bolt.
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Old 12-05-2020, 15:05   #23
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

It's the shift rod. undo the long nut all the way.
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Old 13-05-2020, 03:02   #24
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

Eventually got it off - Soaked it for 24 hours with liberal amounts of CRC and then took a wooden wedge in between 2 bits of ply and hit it repeatedly really hard and it eventually came.


My next questions are:


In the two attached images there is a Red Arrow - What exactly is this? It looks like a rubber impeller, but half way up towards the engine. In the generic Yammy manual I have it does not show this part.


In the other image with the Blue arrow, I presume this sits in at the same place as the Red arrow in the first image? - Is it this that got stuck? Should I grease this up or does it need to spin the impeller looking object?


Anyone who has a Manual for a 15HP Yamaha Enduro 2 Stroke 2016 Model, I'd really appreciate a copy of it - Can't find one for love nor money with google.
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Old 13-05-2020, 07:16   #25
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

Need to know the model number of the motor, will be something like E15XXXX, where 'x' are letters. There may be 4, 5, or 6 letters following the '15'.
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Old 13-05-2020, 19:40   #26
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

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Need to know the model number of the motor, will be something like E15XXXX, where 'x' are letters. There may be 4, 5, or 6 letters following the '15'.

Hi Jim,


See image
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Old 13-05-2020, 20:01   #27
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

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Originally Posted by UFO View Post
Eventually got it off - Soaked it for 24 hours with liberal amounts of CRC and then took a wooden wedge in between 2 bits of ply and hit it repeatedly really hard and it eventually came.


My next questions are:


In the two attached images there is a Red Arrow - What exactly is this? It looks like a rubber impeller, but half way up towards the engine. In the generic Yammy manual I have it does not show this part.


In the other image with the Blue arrow, I presume this sits in at the same place as the Red arrow in the first image? - Is it this that got stuck? Should I grease this up or does it need to spin the impeller looking object?


Anyone who has a Manual for a 15HP Yamaha Enduro 2 Stroke 2016 Model, I'd really appreciate a copy of it - Can't find one for love nor money with google.
That's what got stuck, it's a rubber shaft support bushing, it's bonded to the shaft, you can just remove it and replace the lower end without it.
The shaft splines should be Greased, not the shaft.
You could replace the bushing and the housing it came out of , but we don't.
It's just not important enough.
The shaft may rattle at idle, you'll not notice it though, unless you know that noise.
Under the housing the shaft goes into, is where the water pump impeller is.
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Old 13-05-2020, 20:06   #28
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

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Originally Posted by Boatyarddog View Post
That's what got stuck, it's a rubber shaft support bushing, it's bonded to the shaft, you can just remove it and replace the lower end without it.
The shaft splines should be Greased, not the shaft.
You could replace the bushing and the housing it came out of , but we don't.
It's just not important enough.
The shaft may rattle at idle, you'll not notice it though, unless you know that noise.
Under the housing the shaft goes into, is where the water pump impeller is.
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Old 13-05-2020, 21:09   #29
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

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Originally Posted by Boatyarddog View Post
That's what got stuck, it's a rubber shaft support bushing, it's bonded to the shaft, you can just remove it and replace the lower end without it.
The shaft splines should be Greased, not the shaft.
You could replace the bushing and the housing it came out of , but we don't.
It's just not important enough.
The shaft may rattle at idle, you'll not notice it though, unless you know that noise.
Under the housing the shaft goes into, is where the water pump impeller is.
SV Cloud Duster

OK that rubber bushing does not want to come out without it being shredded and I would probably leave bits behind as its quite hard to get to - It is welded to the housing - I must of forced it if off the shaft.


Can I just leave it where it is and push the shaft back down through it with some grease?
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Old 14-05-2020, 08:13   #30
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Re: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke

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OK that rubber bushing does not want to come out without it being shredded and I would probably leave bits behind as its quite hard to get to - It is welded to the housing - I must of forced it if off the shaft.


Can I just leave it where it is and push the shaft back down through it with some grease?
Well you could, leave it but you'll have difficulty reinstalling the lower end.
It's not supposed to be on the shaft it got stuck on there.
You'll not be able to change out the impeller if it's left on as well.
Cut it off, and clean up the shaft, maybe change the impeller as well if you feel inclined.
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