How A Lower Unit Fills Up With Water

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[@CaptDavesSportfishing]

THAT BOAT is a treasure trove of youtube content for ya, huh? I wish I had room to buy/restore a ALUMINUM ole junker.

[@guyanesegamer1693]

I did one it was worth it

[@rockhavenfarms7213]

You know there's something t an old boat when someone with access to literal tens of boats at his disposal chooses to only play on the one.

[@CaptDavesSportfishing]

The one that he'll flip...duh yeah. ​@@rockhavenfarms7213

[@gregfeldman6818]

“THAT BOAT” is Lucky Aaron found her/him

[@cmetzenberg]

Just had milky oil. Shaft seals looked crummy. Watched one of your videos. Replaced seals. Pressure tested good

[@SniperViper198]

Hey born again boating. Here's a tip my dad taught me. He replaces theower unit springs in the oil seal with an o ring. Same on the trailer bearings. I haven't had to replace trailer bearings since 2004. So where saltwater touches we use an o ring instead of the spring. Remember tk use a slightly smaller o ring

[@gregfeldman6818]

Interesting! Great Comment. I’m a little afraid to experiment on customer jobs, but, may someday try it on one of my projects

[@BornAgainBoating]

Interesting! Never heard of that but I like it! :)

[@malekodesouza7255]

I had my lower on a Suzuki 150 leak. Tech told me it was the upper seal. He re-sealed the unit and so far, so good.

[@crispernator]

Gday mate another great video with tips on what to do and where to look , ive seen a number of ways to get those prop seals out and although they seem fairly easy you have to be extreamly carfull as you said not to scratch that shaft take care .

[@jamesyoung6829]

For a layperson like me these videos are fascinating but also scary when you think of all the components in an engine or lower unit that could fail at any time without warning! 😮

[@kaotix147]

Thanks for video. I recently purchase a 91 chris craft with a 3.0l omc cobera stern drive. I believe the engine is a 89 thought not 100% on that. I need to replace the screw dip stick gasket, vent gasket and drain plug gasket. It been super difficult trying to find the correct part as I see o-rings, flat gasket, and also what appears to be a hard plastic material gasket. Any advice in how to find the correct gasket?

[@stanleyhasting6047]

What about the big round gasket?That holds that lower unit in place before you get to the gears?

[@kuang01]

more and more great content came up making the channel a boat mechanic library! thank you as always!🎉

[@thurmondhomeinspections5946]

Hey Aaron. Love the channel. Always great content and have been a subscriber for some time. I’ve got a 2003 Yamaha 90 Tlr 2 stroke. I’m going to die on that simple 2 stroke hill. It Wasn’t circulating water so I rebuilt the water pump. Didn’t help. I had to go through the exhaust intake (absolutely gross) and pull the power head to extract bolts. While I was at it I replaced all the gaskets and thoroughly cleaned everything. Got it all back together and now get far more water than this baby has seen in a long time. So much so, that it’s leaking water out of the top of the drive shaft but under the power head (not into the bottom cowling). Just above the mid section towards the transom where the drive shaft spins. Right above the apron. I’m not sure what to do at this point. So I started to rebuild the water pump again hoping to avoid pulling the power head off once more. Any ideas?? I have been spinning my wheels trying to sort this thing out. Once I get the lower unit back on I’ll fire it up to see if that helped. If not I guess I’ll pull the power head and my hair out.

[@mikencrew8885]

Man you are killing it with the videos. Love it!! ❤❤🎉🎉🎉🙌🙌🙌

[@lewisbenjamin5298]

I cannot find a 3/8 pressure tester anywhere.

[@DrewHall-un8sn]

I'm impressed with your ability to say "shift shaft" without messing up. On the serious side you're doing great work. That lower unit looks a lot like my Nissan.

[@BornAgainBoating]

Thank you lol :)

[@allanfaust1011]

I have a similar shift shaft. after changing my water pump, when i put the lower end back in, my tranny wont shift (F, N or R) I know the top is shifting (when i looked in the top end and went through all 3 gears). Could it be because its pushing it up and not engaging, or what?

[@BornAgainBoating]

You probably missed the shift shaft all together my friend! You should take the bolts out of the lower unit and lower it slowly, looking at the shift shaft and see if you got it up into the shift shaft on the engine :) most likely it missed and so you just need to put it up so they go together and you'll be fine ;)

[@allanfaust1011]

@@BornAgainBoatingThx… no, i didn’t miss it… decided to go it e more try theis afternoon…lowered it,put it in forward up front… switched the shaft to neutral then forward, lifted back in and it popped into place… the plastic unit in the upper unit holds th upper part of the shaft in place, so I don’t believe I missed it, but glad. It’s finally fixed

[@allanfaust1011]

I take that back… not flexed… tried it on the water and forward is now reverse and reverse is forward,,,

[@cmmaine100]

Will this cause the Gear Lube/Oil reservoir in the Bilge compartment to erupt itsCap off, and spray lube INTO the Bilge/Motor compartment?

[@BornAgainBoating]

There could be a couple of things going on that will pressurize the lube. It happens when the lube heats up so there is that, there could be a problem with the cap, but then more than likely there is a leak and water is getting into the gearcase and pushing the lube up and pressurizing the case when ran, you should check you gear lube and service the lower unit and pressure test it.

[@matthewtrudeau4616]

Awesome video! Thank you. Learned a lot!

[@krisramos7453]

Why don't motors have some sort of sheer pins to protect all the shafts and gears if you smack something? I know my old boat had an aluminum prop which from experience I can tell you it bends before any damage happens to the shaft. But the stronger stainless props I'm not sure.

[@BornAgainBoating]

Nope, not really any pins or anything that can be for protection or else it weakens and creates failure points in the engine. But the trim units have bypass valves that are supposed to allow the engine to pop up out of the water when you hit something, but it takes a good hit for that to happen. There are some Prop Hub designs that do something similar, but there are a lot of solid hubs as well for performance, and no, stainless is not going to give much lol with a solid hun and stainless prop, the lower unit is what is going to give. That's the back and forth discussion, it depends on how you use your boat and what you are looking for, both have their benefits.

[@dereckhunter3131]

Hey born again boating I have a alpha one GEN two lower unit that’s leaking oil out weep hole, I just recently purchased this boat and had to install the lower unit onto the boat and I filled it up and now it’s leaking out that hole. What should I do?

[@BornAgainBoating]

Well, you gotta follow the oil leak, figure out where it is coming, is it just residual from when you filled up the lower? Or is it used oil that is coming from somewhere else? For an oil leak you just have to trace the oil leak back to the source :) I'd try and clean it all up the best you can, then, you said you filled it, so all the oils should be full. Run it on the hose there at the hose and let it run for 5-10 minutes. Then shut it off and look around and inspect to see if the oil starts leaking out again. If it does, follow it back, and if it doesn't, it sounds like residual

[@markgrand3346]

Is that a OMC stern drive? Hiw did you drop that part? I’m looking to replace water pump impeller.

[@BornAgainBoating]

No, it's an outboard lower, OMC stern drives are different because they have an upper and a lower, but the stern drive lower has basically the same types of seals

[@p1mm3]

Bought a brand new motor on auction from a company for 2 weeks ago. Havent even been out on the lake yet but when its tilted theres a oil leakage from 2 small holes located in front of the shift shaft. :( I cant determine if its gearhouse oil or not because it feels more lubricant and thinner but at the same time it does not smell like motoroil.. Could it be gearhouse oil anyways? I filled oil from the level plug because there was already a bit of oil in it but not so much..

[@BornAgainBoating]

Most likely it is engine oil, but it could be gear lube, though if it's gear lube the lower unit has an issue, if it's an SEI that would make sense, but brand new, it's probably OEM and most likely oil

[@rockhavenfarms7213]

Love from Durban South Africa bro. Keep up the videos as we have been using them as our "shop manual " since I found your Chanel back in 2019.

[@tylerdegrand3034]

I've noticed a lot of water leaking from my intake vents after boating. It's only water, no oil. To be sure, I changed my gear lube oil and found no water in there. Should I be concerned? I trailer my boat and never used to have a puddle of water in my garage after each outing, but now I do. Also, I don't lower the unit after each outing; it's trimmed up and only lowered when in the water or when working on it. Thanks for the Great video!

[@BornAgainBoating]

Most likely nothing, water will be coming out the intakes of the lower unit for a little while after using the engine, that is just water draining from the engine, the exhaust, the lower unit around the bearing carrier, and the rest of the cooling system. Especially if you trim it down after using it, all the water in the lower will drain out around the prop. Straight water isn't a problem that is coming out the water intakes of the lower after using it. Not sure how you didn't notice it before though, but from what you are describing doesn't sound like an issue

[@tylerdegrand3034]

@@BornAgainBoating Thanks for the detailed response!

[@PapaMav]

Great vid; thank you.

[@motorv8N]

Great lesson - that’s about 4 more leak points than I thought there were!

[@BornAgainBoating]

:)

[@Nolaman70]

Extremely helpful. Thank you. Going get a pressure tester tomorrow as I saw oil in the water today. Next drain, and see if it's milky, Pressure 10 - 12 psi and soapy water if it's dropping pressure. Go from there... Hopefully, it's not the inner one.

[@marsbotbyl159]

And if you're lucky enough to live in Canada. The lower unit will crack really bad!

[@alanberner-h5j]

very good , clear speaking , easy too follow

[@BornAgainBoating]

Thank you

[@transientboater]

Doing a confessional, beads are in hand for penance. I never used a crush washer on vent or bleed. Why, one may ask. It came down to doing a trip where I had to make schedule. To button up the list to leave, I had to change the lower units lube. Yep, lost the washers in one of those plastic catch cans with 16 quarts of old oil. I digress a moment on this- it was a wal mart catch can that never would drain in to its well without drilling out the drain. Yeah, the first washer went into the drink. I pondered that for a moment. 'do I use the remaining washer at the vent or for the drain on the lower unit'? I had teflon tape for gas pipe and used it. I don't remember if it was used on the vent or drain at the time, but kept using the method of gas pipe tape. That Merc 115 2 stroke was rock solid, gutless above 4k altitude but damn, it was all was good when I changed the oil in the lower unit at the end of season. Thanks for the content. There are many in to cars/trucks and then there are us into boats and the outboards.

[@dannyvision730]

Good stuff !

[@nwrx247]

With muffs on,engine running is the lower end unit supposed to get warm like hot .would that be normal

[@thetruejuanalto]

if the lube gets refilled does it stop the aeration and warping of seals? or are they sealed units that require replacement of seals before servicing...? ty ty

[@howardparsons3371]

love the great content and information on the lower ends. Keep up the wonderful work.

[@slimmm723]

excellent. What about a cracked housing?

[@whoabigthymer]

Haven't seen Donny in awhile. Is he still a part of the team?

[@bennyramirez3942]

Got a lower unit that bad what is the same as a nissan lower unit

[@K_M_M_G]

I’d love to have that 2-stroke 90 Yamaha

[@jerryq1000]

More great information. Helps to know what's inside so if there is an. issue, it's not quite as intimidating.

[@acme9538]

What is the estimated life under normal use these Yamaha seals last? I'm at 575 trouble free hours on a Yamaha F70 . . . best motor I've ever had. Great Video . . . new subscriber !

[@Nolaman70]

I have no real answer. I only wanted to say salt water will be sooner.

[@mikewehner2858]

How do you get that bearing carrier out ? I don't see any screws etc to loosin it. 2007 150hp Yamaha

[@BornAgainBoating]

Hey! Rose here, supporting Aaron with comments. Thank you for your comment! I've saved it for a detailed response/illustration in a future upload. Be sure to tune in so you don't miss it!

[@HahaVideos-xj7yt]

An aligator at 60mph will cause a leak, a reef, a chain, and a rock. Also, if you don't change the oil, or if your shift cable is adjusted wrong, and your gears come out of the side of the lower unit, will cause water intrussion

[@gregfeldman6818]

Try to keep the gears inside the case, if possible.

[@davidd8435]

I am going to makes these videos for a boat maintenance library there are a lot of information in these videos. Are you working on your boat or a customer's boat?

[@gregfeldman6818]

Don’t Poach the Man’s Work

[@Gregg0112]

Do the lower units have vents? I couldn’t see one on my f50 lower unit.

[@BornAgainBoating]

Idk what you mean by vent? Make a new comment so it goes to the top of the list ;)

[@libingliang7967]

One question: Do I need to drain the lube before the pressure test?

[@PrefersAnonymity]

No

[@boshmarine7696]

Well explained thank a lot

[@motodiver6720]

❤

[@andreireal9158]

also a gearcase oil dripping from the water intake grate is a sign that driveshaft seal is failing

[@kenn1320]

Interesting. I have a 2019 merc and gear lube leaking from the coolant drain towards the bottom. This is typically the drive shaft seal?

[@marklaw2845]

Great video!!

[@iknowgood2403]

Nice

[@lliamnapoleon5167]

Nice video.

[@gregfeldman6818]

Best I’ve seen

[@SebP-h7k]

What a great one! Thanks! 👍

[@1celtickiwi]

this is a great vid. cheers mate

[@bengilluyando9489]

Thank you so much for these videos

[@BornAgainBoating]

You are welcome!

[@robertjackson7590]

Spring side should go to the oil, that's the direction I installed them. Great video as always.

[@antho7475]

That's not correct,They are installed that way to allow pressure out when you run for a long time and the oil gets hot and expands, sort of like a breather in your cars differential or transmission. Also when a hot lower unit cools at the ramp or trolling after a long top rpm run back from Bimini , The oil contracts and water can be drawn into the lower unit through the prop seals . That is considered " normal"

[@robertjackson7590]

@@antho7475 I had seen people find low oil levels and next to no oil in Yamaha LU's. I did when I bought mine used. I understand what you're saying but I've had no problems and correct me if all the LU's from all the companies in the past worked fine with the inner seal lip facing the oil? As long as it has room to expand when it warms up it can't hydraulic the seals out. The hot oil doesn't expand more than 1/2 to 3/4inch from the top screw if that much. Shouldn't blow the seal from that. The inner seal spring faces the oil, the outer faces the water. That's what I did. I don't put a lot of hours on mine I admit. PS even with the pad at times. I do appreciate the explanation on their intent. kzbin.info/www/bejne/Y4HEaZKAoNBkrcU

[@antho7475]

@@robertjackson7590 Thank you . that makes sense also l think l will try that next time . Who knows maybe Yamaha planed it that way in order to sell more LU. 😀😀

[@robertjackson7590]

@@antho7475 Run a good syn gear oil like Amsoil and if you run 24-25 pitch or more bypass the Neutral safety and start it in gear. The LU will last years longer.