How an Outboard Lower Unit Works | How an Outboard Gearbox Works | Boats.net
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- เผยแพร่เมื่อ 23 ก.ค. 2024
- 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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As a novice boater, this was an amazingly useful video. Very well explained.
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!
incredible well explained and produced video. Thank you for another quality product. I have no idea how anybody could "dislike" this video. Thank you!
Q0
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.
TH-cams the place to go
New to outboards. Great instruction!! I "saved" it for future maintenance.
Thanks
I am a marine engineer and I learns too much good knowledges from your channel. Thank you so much.
Brilliant. Very informative, precise and concise. Thank you.
Great job clear voice and nice detail. The cut away view is fantastic
This guy did an amazing job on this video! Well done!
Awesome video. Very detailed and informative. Thanks.
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
Great explanation of lower unit basics.
Thank you- very clear straightforward lesson, you are an excellent teacher,
Very nice video. very clear and informative.
Thank you for sharing.
Terrific video. Very informative and simple to understand. Thanks.
This video was so awesome for us novice boat owners. Great job!!!!
Great! It was awesome for us to cut it apart.
Clearly explain the lower unit. Awesome
Thank you for explaining this so well
I love your explanation sir. Thank you
Superb video, high quality content, thank you
Awesome video. Very informative!
This was a really great video. You guys rock!
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.
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
Excellent explanation, nice job!
Great vid. Thank you!
Thanks for the vid! Learnt heaps
You're a fantastic instructor
Very helpful, thanks!
Finally a video that actually makes perfect sense 👌
You guys are awesome. Thx for the education.
Thanks for sharing how the lower unit works. I was curious on how it really works.
Solid video thank you!
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
Super helpful, thanks!
Great video!
Such a great video bud. Well explained.
Thank you sir very informative and helpful video
Great video, thanks!
Thank you so much for this. I'm building an electric boat motor and this was so helpful.
Very good presentation.
Amazing video thanks!
This was fantastic.
Great explanation thank you!!
Excellent tutorial
Great video, lots of good information!
Good explanation!
simple and straight forward
AWESOME INFORMATION
Excellent video thank you
Keep teaching sir, it's great, class of mine
Well done!
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.
Very good information.
great video!
Man excellent video thank you sir
Very informative
great vid
great video.
Top gun marine mechanic, full of knowledge
Great video.
NICE JOB WELL SPOKEN
Wow. Great video and explanation showing the different components and functions! Thank you
Well done, mate!
Great video 👍
Nice job
Thank you
This was so helpful! Do it with a Verado someday?
Thank you for your love of sharing. Questions: any video for install inlet valve and exhaust valve spring valve and rocket arms. Thanks
Very very nice 👍👍👍👍👍👍
thank you.
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
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?
Very good and well explained wish to work with u
such amazing video that let noob like me understand things i wouldnt ever think i will be able to know
GREAT STUFF, MAN. JUST SUBBED 👍
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!
Tq bro....🤝
Extremely clear. Well done video. Would be good to know variances from freshwater to salt for seals etc given environmental factors for maintenance schedules.
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.
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.
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?
@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.
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 ?
Great video. TryIng to figure out why my Yamaha 4 stroke making a howling noise and bugs out once in gear in the water
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.
Yall are Outstanding !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :)
Very good video 😂
good evening Do you have a video explaining how to reinstall trim sender on a Suzuki DT85?
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 ?
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
Very good video, Garrett is a very good teacher.
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.
Hi.
My 09 etec 150 has about 1/2" up, down and 2" wobble which I noticed when checking water pump. Your thoughts
Question for you, hope you can help out. My 1990 mercury 40hp has been getting stuck in forward, I had to drop the lower unit and manually reset the shift rod to neutral three times last summer. Any ideas why this is happening? Usually happening while pulling kids on tubes.
Really great explanation of the system. Thank you.
Any tips on removing middle drive shaft housing thingy on a 9.9. Lower unit came off/apart easy. Seriously siezed together.
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
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
Is there a hose or something that hooks up to the tube. I’m new just trying to figure out how it works
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.