Lower unit oil, drip from exhaust / intake ?

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Lower unit oil, drip from exhaust / intake ?

Postby Weedwacker » Thu Sep 12, 2013 6:14 am

I just purchased this 1972 BP 100, as it fits one of my smaller boats, light weight, quite, etc.

Runs like a champ and all I have done is basics, oil change, rebuild carb, lower unit fluid, plugs, everthIng was tight and clean.

On these engines, the intake water and exhaust are just below the cavitation plate, same tube handles both function , one faces forward, the other rear.

My issue, last time I ran it was two weeks ago. Today I get home and notice small amount of oil dripping from the exhaust tube which is also the water intake on these older engines. It's LOWER unit oil?? Not motor oil. I wiped It all clean and it is clean lower unit oil?? Has that smell and color.

What in the world is going on?

Lower unit oil, it's not coming down or over or anyplace from the lower unit drain or fill holes?

Much thanks for any suggestions!
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Re: Lower unit oil, drip from exhaust / intake ?

Postby 18javelin » Thu Sep 12, 2013 6:33 am

Seal bad. Prob have fishing line behind prop. Have to replace it.
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Re: Lower unit oil, drip from exhaust / intake ?

Postby Weedwacker » Thu Sep 12, 2013 6:58 am

18javelin wrote:Seal bad. Prob have fishing line behind prop. Have to replace it.


OK, as a shade tree mechanic, which what seal is it called and located?
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Re: Lower unit oil, drip from exhaust / intake ?

Postby 18javelin » Thu Sep 12, 2013 10:46 am

Sounds like a prop shaft seal to me.
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Re: Lower unit oil, drip from exhaust / intake ?

Postby Weedwacker » Thu Sep 12, 2013 10:55 am

18javelin wrote:Seal bad. Prob have fishing line behind prop. Have to replace it.


In case I didn't explain this prior, the lower unit is below the area that is dripping?

So how is gear oil going UP ?

It's coming out several inches above the top fill hole of lower unit.

Would a prop seal do that? Prop area is dry.

Thanks again.
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Re: Lower unit oil, drip from exhaust / intake ?

Postby 18javelin » Thu Sep 12, 2013 11:22 am

My bad I read into the thread title. When I read post explanation didn't overide thread title. Figure it out by tearing into.
Underradar wrote:Well, its sad really. One day he's happily posting pics of road killed coyotes he posed as if he shot them, the next, he's stomped down the shower drain like a soft turd.
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Re: Lower unit oil, drip from exhaust / intake ?

Postby 18javelin » Thu Sep 12, 2013 11:23 am

Sounds like u need to tear lower unit off.
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Re: Lower unit oil, drip from exhaust / intake ?

Postby Weedwacker » Thu Sep 12, 2013 11:54 am

18Jav, I don't have an issue with taking lower unit off.

But, that doesn't tell me what I am looking for that is causing this?

My limited experience, that could be replace every item from a-z , hoping it stops the drip.

It's the lower unit oil self contained ?
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Re: Lower unit oil, drip from exhaust / intake ?

Postby Boatman » Thu Sep 12, 2013 2:52 pm

picture?
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Re: Lower unit oil, drip from exhaust / intake ?

Postby Weedwacker » Thu Sep 12, 2013 3:39 pm

Picture below is looking forward, that vee shape port is the exhaust , on other side, left side, is the water intake with screen cover ( not in photo). Oil drip is at bottom of the circle shape above the vee exhaust port.
Hope I explained that correctly .

Again, this is all inches above the oil fill for the lower unit?

Much thanks for any suggestion .
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Re: Lower unit oil, drip from exhaust / intake ?

Postby 18javelin » Thu Sep 12, 2013 4:23 pm

Buy a new one.
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Re: Lower unit oil, drip from exhaust / intake ?

Postby maclavin » Thu Sep 12, 2013 4:38 pm

Remove lower unit and inspect the driveshaft seals.




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Re: Lower unit oil, drip from exhaust / intake ?

Postby Paddles Down » Thu Sep 12, 2013 6:39 pm

Sounds like it may have been running real righ and there may be the 2 stroke oil residue in the exhaust. Seen it before, if that's the case nothing to worry about.
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Re: Lower unit oil, drip from exhaust / intake ?

Postby Paddles Down » Thu Sep 12, 2013 6:41 pm

Sorry righ was supposed to be rich in oil mix that is.
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Re: Lower unit oil, drip from exhaust / intake ?

Postby Boatman » Thu Sep 12, 2013 6:48 pm

Paddles Down wrote:Sounds like it may have been running real righ and there may be the 2 stroke oil residue in the exhaust. Seen it before, if that's the case nothing to worry about.


This Check your gearlube,if it is not milky you are good to go. Gearlube will have a strong smell,2 stk oil will not. All 2 stk's have some unburnt oil-gas in the exhaust,it's how they are designed. It is more of a problem in older outboards because of smooth cylinder boars.
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Re: Lower unit oil, drip from exhaust / intake ?

Postby TaylorMann1 » Fri Sep 13, 2013 6:20 am

Are you positive that it's lower unit oil? I believe it's a gas/oil mix, because of where it's leaking. Unless there is a top seal leaking. I would drop the lower unit and just check. If that looks good, Have you checked the compression of the engine recently? Also, what color are the spark plugs? Are they the correct plug that's correctly gapped?
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Re: Lower unit oil, drip from exhaust / intake ?

Postby Weedwacker » Fri Sep 13, 2013 10:37 am

Gents, thanks for all the comments, this is a four stroke, not a two stroke.

It is gear oil, not motor oil.

It is not milky.

I dropped lower unit last night, going to replace drive shaft seal as it is the only thing I see that could allow the gear oil to come up.
Replace impeller while I am at it and gaskets.

Ordered parts this am, we will see if it solves the issue once back together next week. Pretty sure it will.
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Re: Lower unit oil, drip from exhaust / intake ?

Postby TaylorMann1 » Fri Sep 13, 2013 12:34 pm

Stupid me I assumed since it was a 1972 outboard that it was a 2-stroke. Hope you get it straight, bout time to shoot some birds.
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Re: Lower unit oil, drip from exhaust / intake ?

Postby Boatman » Fri Sep 13, 2013 4:46 pm

Well that changes things a bit. What motor is this,1972 4 stk outboard? There should be a shift shaft seal as well,or is it start in gear forward only?
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Re: Lower unit oil, drip from exhaust / intake ?

Postby T Man » Sat Sep 14, 2013 10:14 am

Weedwacker wrote:Gents, thanks for all the comments, this is a four stroke, not a two stroke.


That didnt seem like pertinent information in your first post? It took me 5 minutes of googling just to figure out your motor was built by honda. Next time you have an issue, you might be a little more specific.

Being that it is a 42 year old 4 stroke, I would think it safer to assume that the oil you are seeing is blow by. Has the crankcase level dropped any? 2 stroke oil and 4 stroke oil smell completely different out of the exhaust.
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Re: Lower unit oil, drip from exhaust / intake ?

Postby jehler » Sat Sep 14, 2013 4:42 pm

Weedwacker wrote:
It is gear oil, not motor oil.

do you think it could be motor oil?
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Re: Lower unit oil, drip from exhaust / intake ?

Postby Weedwacker » Sat Sep 14, 2013 7:36 pm

Not sure how the Honda brand was omitted from the post?...

But, it's a four stroke and it is GEAR oil, not motor oil.

Thanks again for comments and suggestions.

Parts are in route as stated prior which should fix the issues .
It's not just a duck boat, it is a tatical platform for opportunity- weedwacker 101

Preserve game and hunt with a trained dog- NAVHDA

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