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

[@barrymullan6363]

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

[@1234Jaytay]

Huge help I just started as a parts manager here in Florida in Sarasota and I really appreciate all the videos they're invaluable and more useful than any video I've ever seen on this platform

[@cemyanikk]

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

[@4739-g9c]

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]

KZbins the place to go

[@allanthomson4639]

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

[@DAlilbigman]

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!

[@apackwestbound5946]

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]

Q0

[@brianl.3047]

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]

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

[@HotBiteKid]

Excellent walkthrough

[@roytaylor3857]

Finally a video that actually makes perfect sense 👌

[@stevew6141]

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

[@josephomalley6650]

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

[@davestavers-pj6el]

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

[@tman2172]

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

[@BoatParts]

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

[@augustinepora4436]

Clearly explain the lower unit. Awesome

[@JohnZamrok]

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

[@SalliKenrick]

Very helpful. Does the mercury drive shaft rotate clockwise or counterclockwise

[@jamesclark9510]

Awesome demo. Keep up the good work

[@frederickshandley5408]

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

[@globalfunseeker6733]

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

[@pawfan]

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

[@purplefurture6960]

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

[@Confidentialcomputing]

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

[@Whisbaby1Vr]

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

[@Jolly-bass-boy]

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?

[@Guerrero1187]

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 👍🏼🙏

[@Leblueskee]

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

[@russellfisher5710]

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.

[@tenexchikumba]

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

[@willysoriano4196]

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

[@15569903]

This was a really great video. You guys rock!

[@johnakagi1088]

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.

[@TheSevillap]

Such a great video bud. Well explained.

[@SolomoniSadranu]

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

[@RobertCowper-f3b]

Could you please show the replacement of the lock plate in the side control for a 2010, 60hp 4 stroke Yamaha. Hoping you can assist ... Bob

[@mrsmd4616]

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

[@LocalVideoAdvantage]

Great video... not many tutorials out there that explain it all. Thanks!

[@leesmith5419]

Excellent tutorial

[@clmb511]

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

[@jamesjannell8706]

You guys are awesome. Thx for the education.

[@charlesronk2989]

I have an 2012 Evinrude E75DPLINC. It is clunking in the lower unit when in forward and reverse, but doesn't clunk when in neutral. What would be the likely culprit.

[@antoniovelasco5675]

Profesional that is all o can say!!!! I have a 2002 Yamaha 225 4 stroke,they replaced the seals twice already and still talking water!it’s worth to keep spending money on it ?or is better just to get a new one…?

[@bentramell729]

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

[@kenlow4028]

Top gun marine mechanic, full of knowledge

[@nikkibiondo7399]

Thank you for explaining this so well

[@jeffehnes8167]

Got water in my gear box, looks like it's coming from the prop seal , will replacing the seals correct the problem and fix the knocking ,or is that more likely the shifter and throttle cables needing adjusting.

[@dylanlangston6668]

simple and straight forward

[@ryanm2585]

If you were to replace the original damaged gearset with new gearset would you need to re shim?

[@MassiahVermaito]

Thanks and very much helpful to me.

[@michealmentoor-yw4cy]

Hi there can you guy's make a video or explain how the gearcase system of clockwise and anti clockwise works,does the gears differ between clockwise and anti clockwise will much appreciate it

[@AlterEgoBand-q8c]

My lower unit came out of the winter, a particularly cold winter, with a crack, 3-4 inches long running horizontally about the same height as the prop shaft. Can I fix it w JP weld to keep the oil in, or is it messed up inside as well and the o ring seal will never hold out the water ???

[@georgeatallah1926]

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!

[@yellamamba4554]

Is it possible for the forward gear to get worn out before the dog clutch?

[@acetech9237]

You're a fantastic instructor

[@richardatyeo9903]

Very good presentation.

[@darrylwandrey7192]

Hello i am trying to put my prop shaft and gear assembly back together how can i tell when the gear selector at the back of housing is in the neutral position it is a 60 hp 4 stroke yamaha cheers Darryl

[@mrsensable]

Hi. My 09 etec 150 has about 1/2" up, down and 2" wobble which I noticed when checking water pump. Your thoughts

[@EasyBookReviewClub]

Superb video, high quality content, thank you

[@TheBluceRee]

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.

[@MrCharleswr]

Excellent explanation, nice job!

[@audreytoves6916]

How do you put the gear in neutral with the lower unit off? The shift rod is not catching, spinning freely. Please advise asap, ty

[@chrisminer5712]

any idea how a newly installed prop shaft can move in and out by a 1/4 inch after it was replaced?

[@jimmycoumanis7008]

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?

[@seandrake7534]

Can the shift dog actually kick out of gear ? I have noticed that I had a clicking. Noise it the shift box under load and you could kind of tell the boat would slow for just a instant I got a new boat this year and put my old motor on it the clicking is still there but now it is like a clutch is slipping also about the time it comes up on plane if I shift it to neutral and back in gear it will start pulling again until it does it again. I don’t know if it’s the lower witch still has the clic or if it’s the. Prop spinning thanks for any help

[@martinkoche4375]

Thank you sir very informative and helpful video

[@dkurth53]

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 ?

[@tracyoliver550]

Out board shifts fine and runs at lower rpm fine but as rpm’s rise, there seems to be slippage and humming noise. Could both dog and forward gear be worn?

[@pascualperrino4071]

Hello I’d to know how can I see the difference between a gearbox what rotate to the left and other what rotate to right

[@garyevora8369]

Not really grinding noise but more of a clunking noise when engaged in either forward or reverse. Any diagnosis is appreciated

[@sonus3306]

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?

[@jarredburns8421]

Awesome video. Very detailed and informative. Thanks.

[@wxmyjnsn]

This was fantastic.

[@danielboltz3635]

Great video!

[@JoseHernandez-kl2wg]

Great video 👍

[@leesire]

Where is your shop? I need mine fixed. It shits sometimes correctly but now hardly shifts right

[@KenH737]

Great explanation of lower unit basics.

[@alstonshipp9240]

Good explanation!

[@ΙωαννηςΒλαχος-θ6υ]

I have a question about a tohatsu m40c lower unit.when a put fwd gear and rotate the shaft clockwise the prop revs.when i rotate the prop the shaft dont move and i hear click noise.

[@davidstegemoller9460]

i see oil coming down shaft after pulling out of water...do I have a leak...tks

[@markdismang8550]

When changing impeller, what gear is should it be left in for ease of reinstalling lower unit?

[@Dirtbiker-guy]

It should be in the forward gear.

[@scottybear6265]

I could use your advice, my brother in law doesn’t do maintenance on his Honda 90 horse outboard I believe it’s around 2015 or 16 the lower unit filled up with water over a period of time when he was using it evidently and he let it sit over the winter and if it froze, you know what ice dose to a lower unit? Well, the ice broke the tabs off the housing of the carrier bearing housing retainer I got it back together and putting all new parts in I cannot get it to shift into forward. It does shift into reverse and work that way no I don’t know what else that ice could’ve done maybe there was more damage than I assumed you got any ideas give me a holler appreciate thank you

[@ProTurbo1988]

I have a 2011 Merc 40HP 4 Stroke, that the prop spin freely when i put in reverse or forward after I hit the prop, what could it be? thank you

[@coryboggs6247]

What could cause play in the lower unit road, about an inch or so? Shift and throttle cables are adjusted but are not able to solve the issue of shifting smoothly. I was told by boat mechanic that there is play in the lower unit but he doesnt have time to look into.it

[@DT-ob6ce]

I would love to see a breakdown of an '82 Mercury Outboard

[@kh2140]

When is there too much slop when engaging forward or reverse?

[@albertkofi9383]

I love your explanation sir. Thank you

[@38012shayes]

I have a 2013 Yamaha 50 t 50 lb. it’s making racket. Is this a common problem with these? No water in lower unit

[@nickeyhicks9288]

Left hand right hand lower unit, is the difference in the gear teeth angle??

[@wofaideal5312]

Very good and well explained wish to work with u

[@shaabankamel9176]

ماشاءالله تبارك الله عليك الله ينور ياهندسه

[@dennisluce2056]

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?

[@georgejordaan1951]

Please assist. I have an 85HP lower unit which does not engage the neutral position properly, meaning that to find neutral you have to apply constant pressure on the shift shaft ever so slightly and once you let go it either jumps into forward or reverse gear depending on the direction you applied force. When installing on the outboard after best alignment, you can hear, what I assume is the dog clutch grinding ever so slightly on the forward gear. I suspect the shift cam and shift plunger to be bad. Would this diagnosis be a fair assumption? Thanks

[@stephenburger7386]

What if you took your lower unit out but it was in neutral and now putting it back together it only goes in reverse when running? Should we be able to take it back out make sure it’s in reverse on the shift control on the boat and in reverse on the spline in the lower unit will that work? Thanks for all the help

[@joetart9905]

Awesome video. Very informative!

[@joseascensao4200]

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

[@benzlee8538]

I'm testing my motor out of the water using the muffs. Is the prop supposed to spin slightly when the motor is on or is it not suppose to spin at all? If its not spinning while in neutral n the motor running what do I need to check on?

[@guitarist0062]

Hello, I have a small gear oil leak. Is it something I can fix myself? I saw all the 6 spots that might cause a leak.

[@leonmaritz2598]

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 ?

[@markdismang8550]

Some say reverse because it leaves the pin in slope of cam shift. If left in neutral it's necessary to bump start it. ??

[@wazup3333]

Can someone explain the bearings? not really explained or shown in the video. If you have saltwater/brown oil inside are the bearing rollers, thrusts the only things you need to replace aside from seals?