How an outboard gearbox works
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- เผยแพร่เมื่อ 2 ต.ค. 2024
- In this video we look at the inner workings of an outboard motor's gearbox. This includes the drive shaft, shift linkage, dog clutch, forward and reverse gears and the prop shaft. You'll see how the dog clutch moves to select forward, neutral and reverse as well as where the exhaust gases flows out behind the propellor.
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Best video on TH-cam explaining how outboard gearbox works , saved me loads of time and money
What an effective teacher you are! (That’s from one teacher to another). Your videos are unique and that is why your audience is so large. Some channels post videos almost for the sake of it and viewers quickly pick up on that. Your viewers know they are going to get the real thing EVERYTIME.
Thanks David, glad you liked it. :)
You are a great teacher, and the level of commitment, cutting the gearbox in this video, is 1:st class. Cheers from Stockholm, Scandinavia.
Just found your site in the last coupler of weeks. Refreshing to see a hands on delivery.
You have saved me a lot of heart ache. Cheers
Welcome aboard! Glad to hear the videos have been helping you. :)
I have learned SO much by watching your series. Just wanted to say thank you for all the effort you make to share your knowledge with others!
Thank you for being here to help teach us about outboards!!!!!!!
You're welcome. :)
I just wanted to add to what everyone else is saying here - Thank you!Wonderful explanation / demonstration.
Thanks Ed!
Hands down one of the best videos on TH-cam
ABSOLUTELY FANTASTIC....best on the internet....bar none! T H A N K S !!!
thanks for tearing into an old lower unit to explain the drive gear and dog clutching operations, helps a lot to actually see the process as I'm trying to narrow down my engine problem. Thanks mate!
+giovannis62 You're welcome, glad it helped. Good luck with fixing your problem. Let me know if I can help.
the outboard motor is truly a bit of marvelous ingenuity, now more so than before viewing this video, thank you!
They are pretty amazing pieces of engineering. :)
Never understood how a gearbox worked, but this definitely cleared things up. Thanks!
That was probably the best video I’ve ever seen showing how the driveshaft actually works on an outboard motor it really was very clear and easy to understand exactly how that worked
Very straight forward and very thorough ! I have NO question at all ! Thank you !
Great to hear, you're welcome. :)
One word: EXCELLENT.
Thanks mate!
I realize this video was made a while back, but thank you for taking the time to do this. Very informative.
You're welcome Grant, glad you liked it.
I never took that apart when I owned an I/O and always wondered how it worked. Awesome job on the prop man. Good video.
I just recently replaced the o ring and prop shaft seal on a Mariner 15 hp. Your video really helps, as its nice to see what I was dealing with.
Brought a boat in that had shift issues to be repaired. After looking at the damage in the lower unit, the mechanic asked me how we shifted the boat into gear. He stated the worst thing you can do when shifting a boat from neutral to either forward or reverse is to do it slow and gently. That motion needs to be somewhat quick and deliberate so that the two metal parts mesh quickly to reduce wear on those two parts. Another thing I found out later on was shifting involving a stainless steel prop. Because a stainless steel prop weighs so much more than an aluminum prop, I was advised when shifting from reverse to forward or vice versa, to go to neutral and allow a short delay before shifting to reverse the spin of the prop. This delay in neutral was to allow the heavy stainless prop to come to a stop before reversing its spin. Hope this helps someone so they don't have to learn the hard way. Your lower unit cut away is awesome by the way. Thanks for sharing.
Aussie guy you are a lifesaver!!
This is just what I needed.
Good on you mate!
I hope you have a great day
You're welcome mate. :)
You are amazing men thanks for your free lessons lol
You're welcome. :)
Dangar Marine trying to replace a prop shaft on volvo penta and can't get the gears to line up inside I didnt know if possibly had to remove a part or removed vertical shaft and place prop shaft in first for gears to line up if this makes sense thank you
Cool vid,i blew up mine due to water in box over time on a tohatsu 25. 4 stroke, but found a new used one from a drowned engine and the store replased impeller seals etc and it worcs like new with little noise etc.Whole gearhouse with internals replased to 1 third of new prize .
Awesome thankyou, i have 50mm crack in gearbox housing at front that has not reached seals yet, do you have any weld videos on gearbox thanks
Daimler Blanco bb
IVE SUBSCRIBED and I'm think I'm now your #1 fan. Who else would cut out a section of a lower to show how it works, BRAVO
+Bassmaster Florida Great to have you aboard! :)
Thanks for all the easy to understand video for a first time outboard owner , really helpful. B O A T. break out another thousand. LOL
You're welcome, hope the videos help you save a bit of money on your new boat. :)
So true bro spent like 2k in just boat alone lol
Good stuff to see for real! I should have checked this out and got the manual before changing the impeller on my zuki. I didn't disconnect the shift rod, now I get to pull the gears out!
Just discovered your channel and this is one of the best videos I've seen in a long time. I've been boating for over 40 years and love to tinker with all things marine... but usually just above the waterline. Until now I've never really been clear on just what is happening in the gear case of an outboard motor. Your commentary along with this excellent visual prop (pun intended!) makes it perfectly understandable. Well done mate. Consider me subscribed!
Thanks mate, glad you like the vid and great to have you as a subscriber. This channel needs more cunning linguists!
@@DangarMarine Do I need special tools to rebuild a gearbox? KT from USA Love your vids!!!
Well explained. Continue making video's please. You should be a teacher.
Thanks mate, glad it liked it. :)
Awesome video!
Thanks mate.
These guys dont fuck around. Good channel
Thanks mate.
Again, great video. I had a mental image of how these gearboxes worked but the cutaway really shows nice and clearly how it's done. Nice.
Thanks mate, glad you enjoyed. :)
Excellent work, this video cleared up a ton for me. Thank you for the clear and concise explanation.
Glad it was helpful!
this video takes the mystery out of how the lower unit gearing works, thanks.
You're welcome, have another one on the clutch and gear selection mechanism coming soon.
@@DangarMarine dirección de taller donde reparan transmisión de un yamaha outboard four stroke 150hp año 2006
Necesito reparar transmisión de un yamaha outboard 150hp año 2006 four stroke
Holy, You were so clear in explaining how that works
Thanks Gavin!
Very educational. Even I understood it :) Thanks.
You're welcome Helge. :)
Just change impeller on my 1983 model of Mercury 80 hp. Functions great in forward and neutral. In reverse the propeller is blocked in both directions. Do you think it has to do with my mistake of throwing it in reverse last time I used it on to high rpm? According to your video, the tooths on the reverse side are deformated?
i didn´t understand EXACTLY how that dog clutch gets movement from that vertical shaft,amidst that rotating assembly; i will continue searching,
Amazing video I had my dog clutch go on the middle of the lake yesterday fml but this video is a big help thanks so much
Glad it helped
I have learned a tremendous amount from you and the videos that you so thoughtfully and intelligently produce. Thank you for what you do for everyone around the globe. I'll keep watching!!
👍
Thanks mate, glad you've been enjoying the vids. :)
@@DangarMarine
And...I've started purchasing parts through Marine Engine. Has been very painless process.
👍
Definitely learned something!
Thanks Mr Bloke, this cutaway with your explanation was most entertaining and enlightening. 👍👍
Glad you enjoyed it
John from Minnesota. Been watching u for quite a while always entertained. And learning more and more bout engines. That I thought I new. U make things very clear. Thanks. We here are having -20 degrees Fahrenheit. With windchill to 30to 35 below. And have 30in snow in one week wish we could enjoy some of ur weather. Without the bug s. Good work mate.
This guy is is brilliant explains everything so simply, even thou he has probably had to learn his trade over multiple years enabling us to fix our on boats thank you sir
I’m very impressed with him. He’s thought things through for himself. He doesn’t parrot stuff he’s heard in the pub or wherever. Real life examples. If I was a marine expert like him I’d like do videos like this, but he’s got it covered!
This is just brilliant!! I had no knowledge of how all this works, it now makes a bit more sense. Many thanks for your explanation of a very important part of the boat. Well Done!
Great video , very informative, I’m in the process of replacing the gears and seals on my 88 mercury 100 HP outboard , water got in it and destroyed the pinion and gears , had my boat for 13 years and kept in good shape , bought most of the seals and bearings but the gears set are very expensive here in the states and kind of hard to find given the year of the motor , thank you so much Sir for all your videos , I am a fan
Bloody hell. And all this time I figured it was just magic that goes on in the lower drive.
Excellent video! Definitely among the best I've seen; clear and concise without lots of superfluous chatter!
The only possible criticism I can muster is that it would be nice to show the "cam" end of the shifter-shaft, to explain better what makes the dog gear move.
Man, this is gold! You are giving average chumps a chance to succeed! It was all magic inside that casing until you cut it away and explained. Beautiful in its simplicity.
Great job explaining, very well done! Love the cut out gearbox, made it very easy to follow. Always wondered how those things worked!
Another excellent video thanks Dangar. Love the cut-away - that really helped see how it works and now I doubly appreciate your efforts to make this video.
Thanks mate, glad you liked it. :)
Thanks for that video and your time to film it
Just wanted to say thanks from Northern Ireland.The video's really help. As the poor sod in a local fishing club who does the maintenance, your video's are invaluable to me.The explanation of the gearbox lower unit is great.
Thanks Kenneth, good luck keeping those fishing boats on the water!
Dangar Marine : I took the thermostat out of my 1977/85hp. Evinrude and am now having trouble getting it back together, not sure which spring goes to the thermostat.need illistration.
Great explanation, thanks for the video
Your videos are absolutely inspired. I love the videos and your explanations. Fantastic!
Thanks Sam, glad you like them! :)
Awesome, I always wondered how that worked. Not afraid to tear into one now. Thanks.
You're welcome. :)
You are the great teacher to us part time tinkers of small engines, thanks a million.
You're welcome mate. :)
Love these early videos!
Imagine my surprise when in my Marine Transmissions class at Broward College in Florida, USA, my professor put on YOUR video to show us a clear example of outboard marine transmissions?
Been watching your videos for a few months now. You produce fantastic content!
That’s pretty funny, glad the video is helpful! 😊
Thanks for that detailed explanation of how the lower unit works. My problem is out of the water reverse n forward works perfect. When submerged forward works fine but reverse grinds n will not engage. Raise motor out of water n back to engaging.
Sounds like the dog clutch is only just engaging so as soon as there is the slightest water resistance on the propeller it's slipping.
Super informative. Thank you for making these videos and keep up the good work!
Thanks James! :)
Good stuff, very informative. Thanks for the great and easily to understand explanation of how the gears work.
Thanks Louis.
You keep your audience engaged and not overwhelmed by pointless content. Thanks mate i'll be watching more.
Very very good explanation.
Well I never knew how the gear box worked, thanks
Excellent.
"Crenellations" I think is the word you were searching for when talking about the dog clutch. 😄. Like the tops of English castles. 🇬🇧
Battlements, too? Crenellations, that's a great choice of words
Excellent video, changing impeller just now and this lets me know what’s going on internally within the engine!
outstanding! Great explaination, thank you for your time mate.
Guy like this are the reason modern society exists.
Not the assholes living in the towers.
The ones that built it all.
Love this dudes channel
Happened onto your channel by accident. Thought the title was DANGER Marine and thought oh this might be a bit of a laugh and clicked on it. MUCH to my surprise I found what I consider to be the BEST maintenance channel on the net. I am a licensed Airframe and Powerplant mechanic, and have a lot of maintenance and repair experience, all on aircraft--none on boats. So I was very pleased to find an INSTRUCTOR of such high caliber. You take the mystery out of the equation. Now I feel better equipped to maintain my new to me sailboat kicker engine. Thank you for such great vids! Of course I subscribed after the first one I watched. Keep up the good work.
Thanks Michael, glad to hear the channel has been helping you look after your kicker. All of your mechanical skills will translate nicely to outboards once you become familiar with them. :)
I'm a new boat owner with lots to learn and this was very helpful Thank you!
Hi William, you're most welcome. :)
A tip as to how to operate your outboard. Our dive club bought a RIB with a 150 Johnson outboard, I'm the guy responsible for maintenance.
When reverse gear was engaged, it would "jump", by that I mean it felt like it was in gear then went to neutral for a fraction of a second, then went back in gear. Eventually it lost reverse.
On gearbox disassembly, it was found that the dog clutch had worn away the dogs on reverse gear. I came to the conclusion that this was due to the previous owner "easing" it in to reverse, clunk, clunk, clunk, rather than pulling the shift lever back decisively to positively engage gear. This wore down and rounded the edges of the dog on the reverse gear and eventually made it so it wouldn't engage at all. As the price of a new replacement gear wheel was rather silly, I sourced a secondhand gearbox with problems, but it had a good reverse gear, and used that to make a good unit out of two, for much less money.
The lesson from this is, when engaging either forward or reverse, shift gear decisively, secondly, don't ram your gearbox into reverse to slow down unless it's an emergency and absolutely necessary. Ease off well before you have to stop, hit neutral and let the boat spend its energy, so you are virtually stopped by the time you you reach the dock, buoy, or whatever you wish to get along side, or moor to.
Always operate your boat with the utmost sympathy, and it will pay you back handsomely. That doesn't mean you can't work it hard, but think ahead and don't subject it to any unnecessary strain, which could be avoided by anticipation and intelligent boat handling.
Changing gears decisively is definitely a good way to keep the dog clutch in good condition. I had a similar problem with this gearbox but just had the clutched machined for only about $20 th-cam.com/video/B4acSf_BgP4/w-d-xo.html
Hi Stu, all of the wear on the Johnson was on the gear, not the dog clutch. I had the dog on the gear machined, as you did, but it soon wore out again, despite lecturing operators to engage gear decisively. I assume this was due to the original gear being case hardened, when the gear was machined, I think it removed the case hardened layer and the material underneath was soft.
The fact that yours lasted after machining may say something about the quality of Japanese components ;-)
Excellent advice. I think the following also applies to cars and all machinery, paying off in the long run in reduced maintenance/costs/profanity
Always operate your boat with the utmost sympathy, and it will pay you back handsomely. That doesn't mean you can't work it hard, but think ahead and don't subject it to any unnecessary strain, which could be avoided by anticipation and intelligent boat handling.
Great Video! Straight forward and easy to understand.
+Andy Niebel Thanks Andy, glad you liked it.
good vids muka
Thanks mate. :)
Wow! Excellent video! Thank you.
Welcome. :)
good work...
That is great Stu, I have pulled a few apart and great to see the side cutaway version. Ross
Well done. Love the cutaway!!
Thank you very much sir .u a good teacher.i learned alot alot from ur video's especially this one .great work
Very cool. Wondered how that worked! Good job. Thanks!
Many thanks. Really informative and presented simple for great understanding...
Thanks Simon.
Thanks this really helped better to see what's in there befor start to hammering. Had to wop on it and found lipping it over never rinsed with fresh water thank God 2cycle oil saved me more work.Haate to see the inside of this Saltie motor ..
Thanks Derrick, glad the video helped you. Good luck with the motor!
Excellent! Well Done! Thank you
Many thanks!
SUPERB...Highly educational. Thank you.
Great video, excellent explanation
Really great educational video -- nice job on the cutaway
Thanks John!
Excellent video. Very informative
Great video thanks. I knew that was the gearbox, but had no idea what was inside!
Thank you so much! This is the way to teach, simple, quick, easy. THANK'S
Great video. Lots of useful information
Fantastic! Thanks!
Thanks for your hard work for us!
thank you for the great info
Glad it was helpful!
great video mate, thank you
Thanks John, glad you liked it.
Another great video. Great work! thank you for sharing.
Thanks Jimmy. :)
Excellent explanation….thank you.
always wondered what was inside...thanks
You're welcome. :)
Thank you, your VDO very clear. A++
+simpsonfishing9 Thanks mate, glad you liked it.
Many thanks. Well done!
Thanks for this. Really helps to be able to actually see the inner workings. Keep it up!
Thanks very, very much! Awesome video!
Glad you liked it!
Thank you
You're welcome. :)
good show
great video
Thanks for the visit
Very interesting, its great visualising how they work