How an Outboard Lower Unit Works | How an Outboard Gearbox Works | Boats.net

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How does a boat transmission work? In this video from Boats.net, Garrett will use our lower unit cutaway to show you precisely how the gearbox works in your outboard. He’ll take you on a tour of the lower unit from the drive shaft, through the water pump, and into the gearbox where you’ll see how power is transferred from your motor to the water.
See the lower unit diagram for a Yamaha F225 here: www.boats.net/catalog/yamaha/...
Read more here: www.boats.net/blog/outboard/l...
VIDEO HIGHLIGHTS
Drive shaft - 0:30
Water pump - 1:00
Shift shaft - 2:40
Gearbox cutaway - 3:00
Lower unit seals - 7:30
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6 июл 2024

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Комментарии : 228

@barrymullan6363 3 года назад

As a novice boater, this was an amazingly useful video. Very well explained.

@cemyanikk Год назад

I am a marine engineer and I learns too much good knowledges from your channel. Thank you so much.

@user-cl2ls7kz7o 3 года назад

Very nice. I finally found a video the actually teaches me something about something. Every other channel is about selling something with only pointing out the obvious.

@yam9635 2 года назад

RU-vids the place to go

@DAlilbigman 4 года назад

Very detailed n thorough! Thanks I love the way you have the areas cut out so I can easily see n understand all working parts. Awesome!

@allanthomson4639 4 года назад

thank you - any chance you could consider showing the basic steps+using the "setting plate concept" to setting/inserting the correct shims to take up the pinion+F+R gear for optimum tolerances, good clear explanation - watched from South Africa

@ipuketshirts 21 день назад

Extremely clear. Well done video. Would be good to know variances from freshwater to salt for seals etc given environmental factors for maintenance schedules.

@roytaylor3857 2 года назад

Finally a video that actually makes perfect sense 👌

@apackwestbound5946 4 года назад

incredible well explained and produced video. Thank you for another quality product. I have no idea how anybody could "dislike" this video. Thank you!

@jenniferday1481 5 месяцев назад

@Leblueskee 4 месяца назад

Thank you so much for this. I'm building an electric boat motor and this was so helpful.

@joseascensao4200 3 года назад

Brilliant. Very informative, precise and concise. Thank you.

@markmurphy137 18 дней назад

Man excellent video thank you sir

@JohnZamrok 9 месяцев назад

New to outboards. Great instruction!! I "saved" it for future maintenance. Thanks

@KenH737 4 года назад

Great explanation of lower unit basics.

@globalfunseeker6733 Месяц назад

Terrific video. Very informative and simple to understand. Thanks.

@augustinepora4436 Год назад

Clearly explain the lower unit. Awesome

@brianl.3047 4 года назад

I've always been automotive-oriented. My wife and I inherited a 1963 Starcraft a couple years ago with a 1994 Johnson 48 SPL. After a comprehensive online boating class, we became boaters. I'm trying to get up to speed on outboards, particularly in regards to routine maintenance. This video was VERY educational. Outstanding presentation.

@jimmyadams9257 4 года назад

Installing new lower unit on a Yamaha 70etlh 1986 having trouble with shifter going in reverse on in forward very quickly. The shifter is in natural and the lower unit is also in natural what am I missing with the reverse problem

@dylanlangston6668 2 месяца назад

simple and straight forward

@purplefurture6960 10 месяцев назад

such amazing video that let noob like me understand things i wouldnt ever think i will be able to know

@frederickshandley5408 4 года назад

Great job clear voice and nice detail. The cut away view is fantastic

@jarredburns8421 3 года назад

Awesome video. Very detailed and informative. Thanks.

@phillipesch7556 6 месяцев назад

Amazing video thanks!

@josephomalley6650 2 года назад

This guy did an amazing job on this video! Well done!

@davestavers-pj6el Год назад

Thank you- very clear straightforward lesson, you are an excellent teacher,

@acetech9237 2 года назад

You're a fantastic instructor

@nikkibiondo7399 Год назад

Thank you for explaining this so well

@stevew6141 3 года назад

Thank you for this informative video! The cut away leg is brilliant👍🏻 It explains visually how a gearbox works and operates I recently bought a boat with very old unknown twin stern drives and twin 1.8 diesel Ford engines- so far I have found that engine 1. Crankshaft turns with prop In drive. engine 2. Crankshaft seized but prop in Neutral and turns! Both stern drive gear levers are stuck so do you think I’m looking at a loss or a project worth investing in? Are stern drives gears easy to unsieze? Thanks in advance for any advice

@grcooley 3 года назад

Very helpful, thanks!

@alstonshipp9240 7 месяцев назад

Good explanation!

@tman2172 2 года назад

This video was so awesome for us novice boat owners. Great job!!!!

@BoatParts 2 года назад

Great! It was awesome for us to cut it apart.

@albertkofi9383 2 года назад

I love your explanation sir. Thank you

@octane_6327 3 года назад

Thanks for the vid! Learnt heaps

@hamnchee 3 года назад

Solid video thank you!

@pashkoskoda3862 3 года назад

Very nice video. very clear and informative. Thank you for sharing.

@clmb511 Год назад

This was so helpful! Do it with a Verado someday?

@bears198542021 Год назад

Great vid. Thank you!

@grndhg86d Год назад

Excellent video thank you

@ImFishHead 4 года назад

Well done!

@MrCharleswr 2 года назад

Excellent explanation, nice job!

@WalwRafii 3 года назад

Great video, thanks!

@pawfan Год назад

Thanks for sharing how the lower unit works. I was curious on how it really works.

@cooperstownnyrealestate 3 года назад

Great explanation thank you!!

@rossnolan5659 3 года назад

Super helpful, thanks!

@joetart9905 3 года назад

Awesome video. Very informative!

@kenlow4028 2 года назад

Top gun marine mechanic, full of knowledge

@danielboltz3635 Год назад

Great video!

@jamesjannell8706 Год назад

You guys are awesome. Thx for the education.

@tenexchikumba Год назад

Keep teaching sir, it's great, class of mine

@martinkoche4375 2 года назад

Thank you sir very informative and helpful video

@carbide72 Год назад

Superb video, high quality content, thank you

@15569903 Год назад

This was a really great video. You guys rock!

@TheSevillap 6 месяцев назад

Such a great video bud. Well explained.

@robertmalvarez4582 3 года назад

AWESOME INFORMATION

@richardhealey9399 2 месяца назад

Great video, lots of good information!

@richardatyeo9903 3 года назад

Very good presentation.

@wxmyjnsn 3 года назад

This was fantastic.

@Patriottoo2 3 года назад

Well done, mate!

@johnakagi1088 Год назад

Great video that explains the seal points and the maintenance. I would be comfortable replacing the 6 seal point seals on the lower unit. Certainly replacing the water pump. Thanks.

@leesmith5419 Год назад

Excellent tutorial

@jameshalstead237 4 года назад

NICE JOB WELL SPOKEN

@user-qy8xq3gv1w 9 месяцев назад

Thank you for your love of sharing. Questions: any video for install inlet valve and exhaust valve spring valve and rocket arms. Thanks

@Guerrero1187 3 года назад

I don’t understand how people dislike these informational videos?? Some people just hate their life. I think it’s a great video,keep up the great work and content 👍🏼🙏

@stevenstreet9754 3 года назад

Very good information.

@TheBluceRee 3 года назад

Before watching this, I barely knew the word lower unit meant. Now I feel like I could confidently tear a lower unit apart. Also am now able to diagnose many problems.

@hobiehollister951 4 года назад

Very informative

@geraldlacasse7986 3 года назад

Great video! Since the reverse and forward gear are free on the prop shaft how can you hold them steady whille measuring the backlash? The clutch dog does not do that since the tooths are smaller than the ones they mesh on the gears. Thanks for your help..please help ! GL

@trevortaliana5944 3 года назад

great video!

@dennisluce2056 2 года назад

Such a great video for a novice like me! I hit a stump recently with my Merc 90 - and I have a little water leaking out just above where my Transom saver holds the motor - If there's no water in my gear lube I should be able to JB Weld that spot right?

@matthewbudlong9813 2 года назад

Nice job

@dkurth53 4 года назад

My Yamaha 2011 175hp, I bent my prop shaft.With the bearing housing out can I pull the prop shaft out and preplace with a new one ?

@georgeatallah1926 3 года назад

Great job very clear video and voice.my Yamaha 115 four stroke 2002 model has a whining noise when travelling about 15-20 kmh noise goes away at higher speeds.otherwise motor runs perfect,can you suggest anything thanks!

@nicholasm2239 2 года назад

great video.

@AutoDiag_ 3 года назад

Thank you

@pino_7428 3 года назад

Great video.

@TheDuffman1986 11 месяцев назад

Brilliant information, my engine wasn’t going forward, just into neutral and reverse, took the gearbox apart n fixed what I thought was the problem but after assembling it back it now goes into neutral and forward but not reverse, I’m starting to think it may be something todo with the shift shaft?

@williamlillie9309 3 года назад

How do you keep your shims in place while installing the bearing carrier? Could I use a thin coating of grease or oil? I own a 1970 mercury 40hp 400 and I am in winnipeg Manitoba Canada watching this video. Great explanation and video.

@ash.133 3 года назад

Very very nice 👍👍👍👍👍👍

@abrahamu5544 2 года назад

thank you.

@Whisbaby1Vr 2 года назад

Great video. TryIng to figure out why my Yamaha 4 stroke making a howling noise and bugs out once in gear in the water

@willysoriano4196 8 месяцев назад

good evening Do you have a video explaining how to reinstall trim sender on a Suzuki DT85?

@leonmaritz2598 3 года назад

I enjoy your video's....I would like to know if the gearbox drive shaft must be shimmed? Must the drive shaft have a play up and down ?

@JoseHernandez-kl2wg 2 года назад

Great video 👍

@chrishampson1394 4 года назад

Wow. Great video and explanation showing the different components and functions! Thank you

@Pre-Unit_Triumph 3 года назад

@Boat Parts Thanks, got it great video. Does the older (1974 Mercury) gearbox shifter work the same? i.e. To select reverse shift splines "clockwise & forward counter clockwise"?? The older Mercs have a sloped cam that goes over the splines. In which position must the spline selector be (forward, neutral or reverse) and at what rotation must the sloped edge of the cam be when fitting the cam? Not sure if this makes any sense. Your help will be greatly appreciated, thanks. Forgot to ask if the cables should be disconnected & if the power dead throttle cable position should be in the same position at the spline selector i.e. forward, neutral or reverse?? NB. This is a replacement motor. Thanks.

@TheFrank1423 5 месяцев назад

Very good video 😂

@wofaideal5312 2 года назад

Very good and well explained wish to work with u

@edy7951 4 года назад

Tq bro....🤝

@jordanking905 4 года назад

Is there a hose or something that hooks up to the tube. I’m new just trying to figure out how it works

@marconunes2340 4 дня назад

There’s not many videos on 80’s Mercury lower units tower of powers

@xelintuttle7581 4 года назад

i would like to see a video on replacing the shift cam

@russellfisher5710 Год назад

Great video, so I have replaced the impeller and now when I put it back together I cannot select the forward/reverse neutral properly from the control. I have selected neutral and put the lower unit back together but when I then try and select the gears via the controller it will go from neutral the reverse and back to neutral but not into forward. I did not touch the gear selector when I replaced the impeller and it was all good before the impeller change. It s a good engine in tip top condition and been well maintained and also not thrashed as it was a sailing club engine that a won in a sealed bid auction.

@bentramell729 2 года назад

Great video but I need help with gear alignment. Just replaced water pump and cant get the drive shaft back up into the power head. Ive put the gear shifter in forward and turned the gear selector on the lower unit to what I think is forward but im not sure

@SaltyMechanicsJunior 2 года назад

GREAT STUFF, MAN. JUST SUBBED 👍

@bouldernelsonbigfoot 2 года назад

great vid

@ihahahuhu3159 4 года назад

good video bro.., what is the gear ratio ?

@markmarks9691 3 года назад

Where on the site can I locate a clear assembly diagram and parts list for the lower casing assembly on a 2003-2006 Mercury 25hp 2-stroke outboard motor? Please provide a specific link for this diagram. Thanks.

@mrsmd4616 2 года назад

Any tips on removing middle drive shaft housing thingy on a 9.9. Lower unit came off/apart easy. Seriously siezed together.

@sonus3306 3 года назад

I would like to know how the thrust from the prop is transferred through the drive shaft to the body of the boat? Is there a thrust plate somewhere in the system as there is in ships?

@sgray1906 3 года назад

Yall are Outstanding !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :)

@jimmycoumanis7008 2 года назад

Two questions. When greasing the drive shaft splines, why is it important to not grease the ends of the shaft. Also, is it necessary to go back into the lower unit to connect the speedometer tube if I forgot to reconnect it?