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Old 07-28-2021, 06:11 PM   #1
ktex
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Default Oil leaking around mid section of outboard.

There are oil streaks on the side of the mid section of the outboard. I checked inside and around the powerhead and it’s dry. Also plenty of oil in the tank. Any thoughts on what is causing it? It's a Yamaha 2 stroke fuel injection ox66. It was rebuilt in December. I’ve been leaving the motor tilted down recently which is probably why I’m just now really noticing it.i

Last edited by ktex; 07-28-2021 at 06:12 PM. Reason: Add pics
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Old 07-28-2021, 06:13 PM   #2
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Burnt oil accumulation in the exhaust tube. Can you post some pics.
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Old 07-28-2021, 06:18 PM   #3
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Default Pics

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2nd pic you can see the oil accumulated in that space between the power head and mid section.

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Old 07-28-2021, 06:34 PM   #4
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Default Exhaust

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Old 07-28-2021, 07:18 PM   #5
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To me that looks like unburnt oil. Maybe a leak around the pump?
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Old 07-28-2021, 07:19 PM   #6
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Freeze plug in bottom of the block leaking? Iím no mechanic but thatís t burn a hell of a lot of boat gas guess!!
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Old 07-28-2021, 07:54 PM   #7
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I didn’t see any oil in the upper unit area. Not sure if it has affected fuel consumption.
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Old 07-28-2021, 08:05 PM   #8
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Fuel is leaking out of the carbs. Probably when it tilted up. Nothing but a cosmetic problem.
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Old 07-28-2021, 08:06 PM   #9
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Bad seal internal oil tank
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Old 07-28-2021, 08:13 PM   #10
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Quote:
Originally Posted by Walker View Post
Fuel is leaking out of the carbs. Probably when it tilted up. Nothing but a cosmetic problem.
Itís direct injection. It doesnít have carbs.
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Old 07-28-2021, 08:45 PM   #11
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Quote:
Originally Posted by ktex View Post
It’s direct injection. It doesn’t have carbs.
I didn't read your original post closely enough.
Does it have all those small gray oil hoses? I'd clean it all up including the cowling pan and then look for leaks and seepage around any oil system components. It could be a problem if it's related to a single cylinder.

Last edited by Walker; 07-28-2021 at 08:47 PM.
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Old 07-28-2021, 10:05 PM   #12
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I believe it's when you trim the motor all the way up. The oil leaks from the reservoir top cap area
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Old 07-28-2021, 10:16 PM   #13
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Oil also collects in air baffle if you have one and can leak out when tilted (carb models, not sure on direct injection)

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Old 07-28-2021, 10:30 PM   #14
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Pull the cowling and look around. It’s coming off the motor somewhere. Probably the oil reservoir or air baffle. It doesn’t look like a lot and probably wouldn’t concern me much unless it’s an injection hose leaking.
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Old 07-28-2021, 10:34 PM   #15
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Quote:
Originally Posted by HTOWN View Post
I believe it's when you trim the motor all the way up. The oil leaks from the reservoir top cap area
My guess also. Do you tilt it all the way up to transport?
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Old 07-28-2021, 10:51 PM   #16
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Quote:
Originally Posted by rvd View Post
My guess also. Do you tilt it all the way up to transport?
No sir, just enough to put the transom saver on…..maybe 15-25% ish…

Last edited by ktex; 07-28-2021 at 10:52 PM. Reason: .
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Old 07-28-2021, 10:56 PM   #17
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Quote:
Originally Posted by Eatíem Up View Post
Pull the cowling and look around. Itís coming off the motor somewhere. Probably the oil reservoir or air baffle. It doesnít look like a lot and probably wouldnít concern me much unless itís an injection hose leaking.
The inside is very clean, no oil at the bottom or visible leaks on components or reservoirs. I wish I could see were it was originating from.
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Old 07-28-2021, 10:59 PM   #18
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Quote:
Originally Posted by ktex View Post
No sir, just enough to put the transom saver onÖ..maybe 15-25% ishÖ
Then maybe not. Iíd take the cowling off and clean everything real good and see if you can spot a leak somewhere when you tilt it. I agree that it looks like fresh oil.
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Old 07-29-2021, 12:18 AM   #19
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Since it was rebuilt recently, why not take it back to the mechanic?
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Old 07-29-2021, 04:50 AM   #20
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Quote:
Originally Posted by Humper View Post
Since it was rebuilt recently, why not take it back to the mechanic?
I may end up doing that. I sent the pics to them as well. Just trying to educate myself about it. If it is something I can just knock out myself it would save me the trouble of taking it in and I would learn how to fix it myself.
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Old 07-29-2021, 10:14 AM   #21
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you could take off the cowling and the mid section. Might be able to see something you weren't able to before.
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Old 07-29-2021, 01:02 PM   #22
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Quote:
Originally Posted by marshhunter View Post
you could take off the cowling and the mid section. Might be able to see something you weren't able to before.
Iím going to inspect it again today. I may try that.
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Old 07-29-2021, 06:43 PM   #23
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Found the area where the oil is coming from, just don’t know from what. It’s coming from the hole in front of the motor right below the powerhead bowl. I removed the top cover off the mid section right below the powerhead. There are no leaks coming from the powerhead, that I can see. My guess is that this oil “leak” only develops during or right after running the motor. Any thoughts?
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Old 07-29-2021, 06:50 PM   #24
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Pics???
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Old 07-29-2021, 07:03 PM   #25
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Quote:
Originally Posted by Walker View Post
Pics???
Here you go. They are flipped sideways, turn them clockwise.
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Last edited by ktex; 07-29-2021 at 07:06 PM. Reason: .
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Old 07-29-2021, 07:22 PM   #26
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Too close. I can't tell what I'm looking at
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Old 07-29-2021, 07:34 PM   #27
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Quote:
Originally Posted by Walker View Post
Too close. I can't tell what I'm looking at
This isnít my motor but I circled the location of the previous pic.

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Old 07-29-2021, 08:11 PM   #28
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Ok, that's not your leak. It's just where the oil is coming out of the cowling pan. It's leaking up on your engine somewhrre
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Old 07-29-2021, 08:28 PM   #29
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Quote:
Originally Posted by Walker View Post
Ok, that's not your leak. It's just where the oil is coming out of the cowling pan. It's leaking up on your engine somewhrre
Yet the cowling pan is dry, no streaks or evidence of leaks anywhere in it or on the powerhead. Itís weird.
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Old 07-29-2021, 08:33 PM   #30
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Quote:
Originally Posted by ktex View Post
Yet the cowling pan is dry, no streaks or evidence of leaks anywhere in it or on the powerhead. Itís weird.
shove some paper towels in the bottom of the cowl and check it every hour or so. You will at least figure out what area on the motor you should be looking. There is no fuel/oil in the midsection so it is coming from somewhere on the powerhead.
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Old 07-29-2021, 08:39 PM   #31
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Quote:
Originally Posted by Wall_Hanger View Post
shove some paper towels in the bottom of the cowl and check it every hour or so. You will at least figure out what area on the motor you should be looking. There is no fuel/oil in the midsection so it is coming from somewhere on the powerhead.
Iíll try that. Thank you. I wasnít sure what was between there.
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Old 07-29-2021, 08:43 PM   #32
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My old Saltwater Series did the same thing it was a bad float in the reservoir sending to much oil. Does it smoke a little during start up?
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Old 07-29-2021, 09:06 PM   #33
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Quote:
Originally Posted by Reelthreat View Post
My old Saltwater Series did the same thing it was a bad float in the reservoir sending to much oil. Does it smoke a little during start up?
I believe it smokes just a little when I start it. How did you check the float to determine it was bad?
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Old 07-29-2021, 09:25 PM   #34
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It just kept getting worse and worse till I took it in. I am horrible with maintenence... Definitely a reactive instead of proactive person but the engine almost had 3000 hours before it blew so it works for me, lol.
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Old 07-29-2021, 09:30 PM   #35
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The reservoir float has nothing to do with how much oil is injected into the fuel stream. The is a small oil pump on the motor that does that.. It could make the reservoir over fill and leak out the cap.
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Old 07-29-2021, 11:34 PM   #36
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Quote:
Originally Posted by Walker View Post
The reservoir float has nothing to do with how much oil is injected into the fuel stream. The is a small oil pump on the motor that does that.. It could make the reservoir over fill and leak out the cap.
I beg to differ, I thought the same but the extra pressure in the reservoir sends more oil and the excess spills. I saw it first hand. As soon as I replaced the reservoir it quit smoking.
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Old 07-30-2021, 12:18 AM   #37
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I’ll ask a buddy about the verdict he received for his ‘05 motor. Same OX66 has been in the shop in POC for a while and they have yet to figure it out. My FIL and his dad both had/have OX66 motors on there boats, ‘03 and a ‘06. Both had the same exact leak. Same exact spot!! The guys at at El Pescador told my FIL that model has always had that issue but never could resolve it. It’s not a serious leak by any means but enough to make you scratch your head.
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Old 07-30-2021, 01:14 AM   #38
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I think its a common issue on those but nothing thats a huge worry.

Clean it up and leave it down for a few days and see if it still leaks?
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Old 07-30-2021, 11:09 AM   #39
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Quote:
Originally Posted by txoutdoorsman24 View Post
Iíll ask a buddy about the verdict he received for his Ď05 motor. Same OX66 has been in the shop in POC for a while and they have yet to figure it out. My FIL and his dad both had/have OX66 motors on there boats, Ď03 and a Ď06. Both had the same exact leak. Same exact spot!! The guys at at El Pescador told my FIL that model has always had that issue but never could resolve it. Itís not a serious leak by any means but enough to make you scratch your head.
Thank you, youíre right it is kind of weird.
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Old 08-01-2021, 08:43 PM   #40
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Ran it again, lower cowling is bone dry. I see oil coming out that hole in the above pic, not a lot but…. Could it be a leak in the gasket that the powerhead sits on?
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Old 08-02-2021, 05:35 AM   #41
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Quote:
Originally Posted by ktex View Post
Ran it again, lower cowling is bone dry. I see oil coming out that hole in the above pic, not a lot but…. Could it be a leak in the gasket that the powerhead sits on?
If that's the case the oil should be burnt. Nothing goes thru the bottom of the powered except water and exhaust. The oil injection pump is on that side of the motor down towards the bottom of the powerhead. That would be something to check.

Last edited by Walker; 08-02-2021 at 05:38 AM.
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Old 08-02-2021, 07:59 AM   #42
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Quote:
Originally Posted by Walker View Post
If that's the case the oil should be burnt. Nothing goes thru the bottom of the powered except water and exhaust. The oil injection pump is on that side of the motor down towards the bottom of the powerhead. That would be something to check.
This sounds right to me.

I don't think its a significant issue but I can relate to the irritation it is causing you.
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Old 08-02-2021, 09:14 AM   #43
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Are you sure it's engine oil? Could the tilt trim be leaking?
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Old 08-02-2021, 02:13 PM   #44
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Quote:
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Are you sure it's engine oil? Could the tilt trim be leaking?
I don't see how. T&T is all below and outside the cowling.
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