Replacing leaking prop shaft oil seals on an outboard motor 

I’m sure you know this but for those who don’t, remove one or both of the oil filler screws as these create a vacuum if in place and makes it much harder to remove the oil seal/bearing housing.

I own a Mobile Marine Business in Maine and have watched alot of videos over the years. Yours are balanced, focused, and extremely helpful. Thank you.

I know you put this up a long time ago, but I wanted to thank you for the info on the pressure testing! You've saved me a TON of money! Thank you, thank you, THANK YOU!!! I can't find anyone to work on the older engines, especially 2 strokes! Your channel had helped me out IMMENSELY!!!

Top videos Stu, keep them coming, you have increased my knowledge of outboards, particularly two strokes. As the previous person mentioned you have started a bit of an obsession. Being a boater here in the UK I have always paid someone else to do what I am perfectly capable of doing myself. Your videos show “the hows” perfectly and I now feel confident in tackling most tasks.

I'll tackle this with cautious confidence now Stu! Many thanks. Your videos are the best resource out there in my opinion. I haven't had a boat for 30 years and just ventured back in with a 'Project'. If only I had this resource in 1988!

What a nostalgic video for me! When I was a younger man, I had acquired a boat with a 1972 85 HP Evinrude electric shift motor. I made my own truarc pliers and home made pulley pullers to get the thing torn down just to adjust the electric shift controller. I spent many late Friday nights tearing the lower unit apart so I can make it to the lake for the weekend. Needless to say, Evinrude finally discontinued the electric shift and went back to manual shift. I would have loved to had a video like this back then! It would have saved me many headaches of trying to figure it all out. Keep up the good work!

great video Dangar. thanks so much. you helped me all the way thru a complete rebuild of my 1992 Evinrude 60hp 2 stroke. did it all myself and watching your videos. never did it before and the motor runs fantastic now. had to re-sleeve the cylinders, new piston/rings, re-build carbs, everything. set the timing, and it runs better than ever. now the oil seals leak, so no problem, i'll get right on it. thank you so much, your methods and instruction are superb. fyi....i bought this old 1992 bass tracker with 60hp evinrude, knowing it needed re-build on the motor, total purchase 1000 $, after complete restoration of motor, spent 1909 $ on re-building the motor, did it all myself. total cost for the complete boat restored 2909 $, that's it. its a 14,000 $ boat new or 7,000-8,000 used. too cool !!!

Great video. Thank you for taking the time to share your skills with us.

Excellent video! We're doing 'surgery' on the lower unit of our 70 hp '04 Yamaha. Got to get the Woodruff key out first...it's being stubborn. We're going to re-seal everything since it appears to have never been into, plus it started leaking oil out of the water inlet holes.

Hi mate, just some feedback that your vids are bloody awesome. Your a legend and thanks for taking the timeout to share them.

Excellent video Stu. Last time I had this done on a mercuiser out drive, I dropped the lower unit off at the dealer and had them reseal it. If my Yamaha ever needs it I'll now do it myself and use this video as a guide!

Another excellent video. I must comment on your patience and ingenuity in tackling this task. I think I would have exhausted a large part of my less-polite vocabulary when encountering such problems. I also appreciate the use of purpose built home tools in this application. Thank you for posting this.

You are so good and your videos are carefully explained. Me and some friends bought a boat with an evinrude 140 with practically little experience with outboards. However your videos are teaching us so much that we look forward to learning and maintaining our engine. Thanks so much for your efforts

Once again, a great help to me! Thanks for sharing all of your expertise! Your videos are making it a lot easier for me to service and fix my three outboard motors!

Good service to the boating community this channel is.

This was the first video i watched. It was the start of my obsession with This channel. 😂😂 Been watching since and love every bit of this channel. #teamdangarstu🤙

Where has this channel been? FANTASTIC! THANKS FRIEND from USA MICHIGAN.

Great videos great eye opener for people that own a boat but have no skills on repairs at least you know what your local shop is talking about and not getting ripped off thanks

Youre a legend ive learnt so much watching you. I found you a few weeks ago when looking for hesdgasket on a 2 stroke 15hp 99 johnson. Which i just completed the head gasket replacement with some help from a knowledgeable friend. But did the waterpump proudly all on my own . Thanks mate. Love the vids your style of delivery and always fun when adrian comes along 😄 ill watch any thing youve made. Must of watch over 50 videos since finding u . Thanks Stu

Hi Stu, Great tutorials :) Thanks for sharing youre time and knowledge,very generous of You :)

Great video and a wonderful summary at the end. I'm so glad I found this channel. You have a new subscriber. Thank you

Thank you. Great to see how this is done and even though I have a manual watching someone do it is terrific...have a great new year and thanks again

just started watching your videos. I enjoy them and find your procedures very helpful. Would like to ask you about a problem I encountered (years ago now). I purchased a new (to me) boat and outboard motor in 1997 to be used fishing in Florida. Boat had been used around New foundland. Everything about the boat was excellent except the stainless steel prop. When I accepted delivery I couldnt remove the prop. No problem, i thought, just get it home and use some proper tools to remove it. I couldnt. Many years later, and multiple dealers later, still unable to remove prop. So, finally I said to myself, I really should get at those seals now. This motor is a 75 hp Honda 4-stroke, and I love it. Out came my torch and big old rubber mallet. I applied heat to that pretty stainless steel hub, more heat, hit from behind with mallet, smoke and fire everywhere, more heat and then pfft a flame shot out and that rubber hub was a smoldering mess on my shop floor. Lower unit has been fully serviced and there is an aluminum prop on the shaft, which probably wont last too long in that sandy water the boat runs in. My question to you is about rehubbing that $400 SS prop I now use for a paper weight. Is this a DIY project, or is it best to send it out? If possible to DIY are you familiar with procedure?

Awesome video, very thorough. Learned allot. Thank you sir!!!

Oh the joys of salt water corrosion! Worked on these motors when I was young, we groaned every time a lower end job came into the shop! Good job Dangar Marine! :)

Thank you! This will help tremendously in looking into the gearbox for a Honda BF225, they look pretty similar. However, with the terrible grinding noises it made coming back into the slip and metal bits coming out with the water when drained, I may be beyond replacing the oil seals. (Heavy mono fishing line was the culprit)

Great vid, however, I would recommend when tapping in new seals place carrier on a piece of wood, not so good having the gear on the concrete floor and hammering down the new seals...ouch.

First, thanks for taking the time to record and share this video. My 1996 Evinrude 88 is leaking oil at the prop shaft. I'm going to pull the prop and take a look at the seals (as best I can) and make a decision on which way I need to go with this issue. This doesn't look to difficult, if I don't get in a hurry. Cheers.

Nice job. I purchased a boat many years ago that the lower unit leaked. I did the job myself and i still have the boat. I wish i watched your video first lol. I looked it up because i have another to do. The evinrudes I have worked on have a special sealant and not the small orings like the Yamaha you worked on.Wish me luck!

Excellent videos, very well done. Your detail is much appreciated unlike many of the others that don't take you through the compete procedure. I am about ready to replace the drive shaft on an old Mercury 9.8 that is pitted at the seal point, I may replace the other seals also after seeing your videos. Thanks

Thanks Stu! Another good vid, keep them coming !!!

your a gentleman and a scholar for what you do

You have the best marine channel....hands down. Can you make a video about setting the shift shaft to the proper position?? Often times, the lower unit will not get in or will be installed in gear if that shift shaft moves. Just seems to jump into forward gear. Then you need to find neutral (if removed in neutral). To do this, the shaft needs to be set in neutral to match the shifter. It seems you did this but it was not shown in the video. Great job with your videos. You explain tasks clearly and concisely.

Your videos have been helpful. Very helpful. Just did year end service and discouraged to find water in lower unit oil. This video is very encouraging will get on it with a lot more confidence. Thanks so much. Jay Bowdoinham Maine USA

my friend just thought I would feel you in I like to learn something every day .Today I learned it's best to leave one plug out drain or fill.Mine made a vacuum sound after she broke free ges seals was good ayy .live learn was a R&R man at a transmission shop yrs ago.never to wise..

Hey mate in the process now best video iv seen are you just heating with a blow torch

Nice work buddy..lots of info and delivered in a sensible way...no B.S.....love your work....

New subscriber here from Oklahoma. Thank you for all your time and effort you put into your videos it is really appreciated...👍

Awesome videos.. thanks!! I just replaced my impeller and the gears are not engaging. Guess I'll have to take it back down and check my alignment or the gear selector. Thanks for the Ratchet strap idea too. Heavy 115 hp lower unit .

Hi, thank you for your video. I had oil leakage problem few days before Greek vacation, so I did it without removing the end flange. I bought just one sealing, drilled hole to old sealing with 2mm drill, I screwed the wood bolt to this hole and pull the sealing out. It is quick way to repair leakage, when you dont have time for complete demontage.

Good job that happen to me ALL the time something so easy.Get so hard, patient is a venture. Just take your time 😉. Keep up the good work love the Challenge..

Terrific video Bud,, just as it happens with the odd gnarly thrown in. Very much appreciated.

Thanks you really helped us out man. Great lesson keep it up. Hi from TEXAS

Hats off mate! Cheers from Colorado

Ah ok is that it. Cheers. Brilliant videos mate, thanks for your help.

You can also replace the seals without removing the casting as you did. Tap 2 screws into the seal (opposite) then screw in the screws a turn or 2 then simply pry out~ do this with both seals. I would recommend using the right size PVC pipe to drive in the new seals to prevent damage. This is all done with the prop shaft in place, as well as the carrier (casting)

Great video, real to the way things often go with a salty outboard, the only thing I do different is I coat all the seals, O-rings and mate surfaces with RTV-black, just that little extra bit of insurance. I think it also helps things slip back into place. kodi

Love the vice grip hammer puller❤ cheers mate

just a fyi,at the factory when these are installed new,grease is applied to the inner lip to lubricate at start up,first rotation.it adds longevity to the seals.ive seen this at the mercury plant...thank you for the videos!

Good video. Like the way you kept your thumb over the broken edge of the bearing carrier when pushing new seals. If you have time can do a vid on connecting the gear rod to the dog on a Suzuki dt55 as you prob know they get pulled out when people remove gear box and drop it down without disconnecting rod at engine side and the ball bearings and springs drop in the bottom. Got two that need repair.

Thank you for sharing all your fantastic videos.. iv'e enjoyed them all and have learnt allot at the same time :)

Good work around. MONEY SAVER!

good video it was a pain in the ass but u did it. thank u for the time u expend showing us how to do it right...

Great vid, thanks man!

thanks for the quick response. it was a white can that had orange numbers on it I couldn't make out the first part but the last numbers were something -56. you sprayed it on the gear case housing to get the bearing carriage out after attaching the pully

G'day Stu. Great to see your sharing the info with general public. As we all know a little bit of knowledge can be dangerous. I've spent the 54 years working on marine engines , drives , installations, servicing, general maintainence and also running my own business in the last 28 years. I notice your having a bit of a problem removing the bearing carrier. Would you be interested in owning quite an assortment stern drive/ outboard McM , Merc, Omc, etc service tools. A fair variety actually. They do make life very easy. Negotiable

Thanks . Just mountet new lower unit gasket kit, on my 8 hp yamaha. Super video . Bedst regards from Denmark 🇩🇰🇩🇰🇩🇰

A Bench and a large vice will work wonders under a good light...

thanks for that boat engine knowledge course I knew that the escape was to and that I was

Another great video, thanks

Love your videos! Thank you!

I noticed antifouling paint on the lower and transom bracket. My lower is seriously corroded because the previous owner used a copper based bottom paint on my aluminum alloy lower unit. The dissimilar metal created an electrolysis condition that accelerated corrosion.

Any tips on removing lower housing in an 05 200 Yamaha 2stroke. Thanks. Great job with all videos

again great help, thanks for sharing

you were first a car mechanic. then you made money. then got a house and a boat, then you love tinkering. im the exact same! great videos. love the real step by step! lets see a video welding up dog teeth in the stripped forward etc and back filing with a little jig?

some great videos, Thankyou very helpful

thanks for the video.

Thank you once again for doing an excellent job in explaining everything, very, very helpful

I'm out trolling fishing and watching your videos while fishing and cruising along hahah and just have the danger shirt on speaking of

Love the content fella!!

Thanks for the videos. Very detailed and easy to follow. You know your stuff.

bonsoir merci pour tout ce que vous faites pour nous remettre a niveau

thank you for posting

Great video... needed to know what I was getting into. I haven't got the tools (gear puller/torque wrench et al) and will have to take it in. grrr....

Thanks for the video you explain so nice 👍

Thank you for sharing.

Your a champ Stue😊😊

oooooops you did it again! Best vids on the net...... you deserve a cold one. Thanks!

Damn your good enjoy your great help .take care Chris from Vandalia ohio USA

Good video mate👌

Brilliant!

good job

May have to try the hammer technique. Replaced my prop shaft. Noticed after some runs that the fluid in the lower unit was completely emulsified when I pulled it. Replaced it and ran some seafoam through the motor to clean out some carbon. Had one of the bolts on the bearing carrier pop off. When I torqued those bolts back down, the prop didn't spin easily at all when in neutral. So I took the gearbox and prop off and have been trying to remove the bearing carrier. Really really stuck! Guess it may be time for heat or hammers. Am already using wd40 to try to get it loose.

Thanks a lot you cut my guesswork

Great vid, thx!

Hi stu great thumb placement lol

my lower unit is definitely fried, grinding quite a bit in neutral. based of how it sounded i just ordered another lower unit when i looked at the parts list part are quite expensive.

Perhaps you could ask the Machinist that repaired the shift dog, if he could make a slide puller, that would slide just over the prop shaft and two holes on either side of the prop shaft.

I looked at the manual and the cups are actually supposed to be as you said, one with the cup side in and one with it out.

Thanks for the video! Would be great to see how to replace those 2 bearings as well while at it

I’ve got a Yamaha 90tlr, trying to replace all the seals. Got a hack for removing the bearing carrier retaining nut? Don’t want to tear up more than I’m fixing.

very useful

Great breakdown! How much pressure are you applying on the pressure test?

Great videos!! I have just inherited a lower end from a Yamaha 30 2 stroke that needs all new seals. Any chance you would do a video on how to reinstall all the gears and seals and shims ?

I mean just looking into the housing after I pull it out of water. Maybe it's the o-ring letting oil around to the outside? Been watching your videos. Great job. TY!

awesome. subscribed.

Hello Friend, very nice and complete videos. I just bought the exact same outbord a F50aet from 1999, im looking for this oil sealings. Could you give me the references or a link for a parts site or a link for a user manual. Thank you !

Love the vid mate, question do I need to put any oil, or grease on the seals before put them in.. Thanks for another great video!!! Thanks Robert

Great and well informative video. Quick question, at how many bar/psi do you pressure test the gearbox?

Thanks.