How do I replace my oil seals in a Mercruiser Alpha one gearcase

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Please see www.sterndrive.... for tech support and exploded view drawing.
This video includes the following instructions:
*A1 Installing upper gearcase oil seal kit
*A2 Remove outdrive top
*A3 Grease u-joint
*A4 Remove u-joint clips
*A5 Remove u-joint
*A7 Remove retainer
*A9 Remove yoke shaft
*B2 Remove driven gear
*B3 Remove small oil seal
*B5 Remove large oil seal
*B7 Polish inside of gearcase
*B8 Inspect seal area
*C2 Drawing of Alpha One parts for upper gearcase
*D1 Coat with Loctite
*D5 Installed small oil seal
*D6 87500 Seal kit parts
*D7 Install large oil seal
*D8 Seal installer
*E4 Polishing the shaft
*E6 Take out yoke
*E9 Install carrier
*F2 Install bearing
*F3 Line the bearing up
*F6 Install on bearing and test
*F8 Check bearings and gears
*G1 Install yoke shaft
*G2 Install retainer
*G3 Install o ring
*G4 Install bolts
*G5 Test play in gears
*G7 Grease shifter
*G8 Install tube
*G9 Pressure test
*H1 Tools you may need

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Опубликовано:

25 авг 2024

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Комментарии : 122

@victorderus2417 3 года назад

"Grease the u joints first, that way you don't lose the pins in the bearing cup" genius! Thank you great tip!

@ericeiswerth6481 7 лет назад

Thanks - this video was a huge help. One note - according to the manual, if the bearings were assembled without the small spacer between the two bearings, there is a different procedure for tightening the nut - my drive didn't have the small spacer and following the second procedure in the manual resulted in about 40 ft lb torque on the nut to get the proper 6-10 in lb bearing resistance.

@braydenluciano4687 3 года назад

Instablaster

@stevewilson5502 2 года назад

Really good tips on this video. My seal kit came with a couple of o-rings that wasn't addressed in the video. I didn't have the plastic or nylon rings mentioned in the last part of the video.

@horaciomartinez2915 7 лет назад

Hello TC, Thanks for the detailed walk-through. One point I'd add is that on the later Alpha drives (and maybe on all) the spanner retainer nut does not clear the ujoints. In other words, Mercruiser says pull the entire bearing and gear assembly out to replace ujoints. Maybe, one might be able to remove the first ujoint closest to the spanner nut by filing the spanner nut edges into a "V," at the 4 corners in the way of the two ujoint pin caps coming out, as you mentioned, but that is a departure from standard procedure (which admittedly will save having to do the bearing preload torque setting at reassembly). If you try pulling it the way you show, though, most people (self-included) will be lost at trying to work with that big spanner retaining nut in the way and will likely snap off a tab on it. Thanks for sharing

@davidmitchell7075 Год назад

Fantastic Content. I'm way less worried about this job. Your time is much appreciated.

@williambrown9124 Год назад

Thank you Wayne one of the best on the Internet, RU-vid watch quite a few of yours. Thanks again.

@gaetanpelletier951 7 лет назад

Thanks a lot I could not have done this without all the good information you gave us thanks again.

@turdfurgeson517 3 года назад

Great video can’t say so much about the audio

@sirlancair 3 года назад

Excellent thanks for the video and attn to detail. If you had a video on the lower unit of the alpha 1 gen 1, I'd have bought from you in a heart beat. Though this helps a lot in terms of confidence, there isn't much on the tube about the lowers..and that's where most of my issues are. Shifting and sealing. Please do the lower next

@dkraft69 2 года назад

i second this

@johncraw6716 5 лет назад

One of the best diy videos in general I’ve seen. Issues w the camera as mentioned. Ask for a camera stand for your birthday. Certainly the best video on this topic.

@williambrown9124 Год назад

You’re good Wayne, another 10 years

@dustinfeigel5219 7 лет назад

Thanks for making this video. Going to be doing my seals soon and this video will be a nice source of info when time comes.

@TCElectronicsMarineToronto 7 лет назад

Thanks for watching

@cdgamer0415 7 лет назад

Thanks for all your time. really help people like me

@michaelmadayag2427 3 года назад

Great job and thanks for video. I'm looking to put together a new upper, due to mine breaking where the trim tabs attach. This video helped out tremendously.

@qkcrl1953 6 лет назад

THANK YOU. THANKS FOR YOU TIME AND YOUR KNOELEDGE FELLOWS LIKE YOU MAKE IT BETTER FOR MENNY

@josepeixoto3384 6 лет назад

What a great video, and it's even more amazing that you can do all that while holding the camera!!

@maz3549 7 лет назад

Many thanks for making this video. Helped me a great deal. Cheers

@Shorething109 6 лет назад

Thanks for such an informative and honest video!!

@irie4i 4 года назад

Thanks, for the video, definitely subscribed, look forward to seeing all your videos cheers

@coldspring624 4 года назад

gold just gold ...thank you

@JohnnyCab 3 года назад

Great video, you shure know your stuff. Good teacher too !

@joeltiru975 3 года назад

Great video. You explained everything I needed to know.

@peterruppert9067 4 года назад

Thank you very much for this video..I just finished doing this !

@tonyreyes678 Год назад

Nice video man!! Thanks for deing so detailed. Thank you

@nicholasvangreat260 4 года назад

Thank you so much! I got 2 sterndrives I need to do repairs and gasket replacement!

@daytonasunset 3 года назад

not the same obviously. I'm doing mine right now, and the replacement kits have other seals. Also the lower seal seems to be 1 thick instead of 2 seals.

@leonardrice2830 5 лет назад

Hey, hello!🖐 You definitely know what you're talking about.👌 I'm a newbie to the Mercruiser universe. Just brought home a 2002 Wellcraft Excalibur 26' w/496 HO Bravo X drive. 233 hours. My question; Why wouldn't one just disassemble everything, inside & out, clean & paint? 🤔 If my drive looked like that I'd either not bought boat or simply bought a new drive.🤔 Just asking, thanks!😃

@osbornes5 7 лет назад

Thanks for video. Its very helpful. question. I used a copper based gasket compound on the two little seals around the shaft that goes down into the lower unit. Will that suffice? Also, do you have to use 680 loctite on the big seal? Also, one of my spacers or shims seems to be split in one place, sorta like a snap ring. Is this how it is supposed to be?

@nelloagostini4389 3 года назад

Great video, only thing that could of made it better is if you were resealing my gear box and I was holding the camera. Thank you and I will be ordering as soon as i get everything sorted

@edbeeinnv 2 года назад

Great video, thank you for making it!!!

@stevengerhardt1221 3 года назад

I figured this is probably a long shot being that this is a three-year-old video. I'm having difficulty lining up the outdrive to the inboard motor. I removed the motor to replace the rotten wood underneath the front motor mount. That's where all my trouble began. I will look through your playlists to see if you have anything that can help me get back on the water. Any advice would be appreciated thank you in advance.

@jaredhardin5315 Год назад

Great job bro and thanks!

@davidjessee7701 2 года назад

Make a pressure tester with a guage with a automatic ac freon refill.. use one with the big can and a trigger.... cut the end off the hose and use the fitting that comes with your gear lube pump.... don't get the freon that has sealer in it...

@dannymatthews855 6 лет назад

Great video. I love the detail and explanations. Question: Can I do the bottom small shaft seal without disassembly?

@larrybelfield9860 3 года назад

This is such a great help thanks big hugs. Do you know what would happen if I left the vent screw off the drive. Mine has flooded with water I flushed it but it barley pushes

@johnwagner9192 11 месяцев назад

I want to replace the gear oil seal and you show tapping it out from the top. Mine does not look like it will tap out through the bottom.

@michaelcarroll4498 4 года назад

Why is the bottom seal spring facing down and the top big seal spring facing up should both seals be spring down ? Thanks nice video

@jasonhardage4459 6 лет назад

Great video but please back away so that you're not so close. It's blurry and it's great to be able to see the bigger picture of what you're working on. Thx!

@fredbinschus5893 3 года назад

Just what I needed....Thanks

@BlueEyeTableRockLake 2 года назад

Thanks, watching because I've got a drip drip drip of gear oil out the upper shift rod . I'm not sure where it's coming from, but I'm thinking one of these seals???

@davesmith8053 Год назад

Great video this sure will help when i do my first rebuid !! Thanks Also Did i miss what u used to polished the shaft with as to type/grit Thank Dave

@coldnnor402 7 лет назад

you were saying 15 lbs pressure test. isn't it 15 lbs vacuum? I did enjoy the video and I appreciate your DIY tips. keep up the good work.

@Bryan-de2gh 2 месяца назад

Would 609 work in this situation also? I have loctite 609. If i dont need to buy 680 id be happy!

@theyarddogs4100 6 лет назад

Thanks this help me out a lot. Carl

@onemoreboat Год назад

Not sure if this a gen one or gen two. I have the gen two and would this be the same procedure?

@dt9094 5 лет назад

Thanks very much. It is appreciated.

@matthickmott6143 3 года назад

Content was great! Thank you!!

@BlueEyeTableRockLake 2 года назад

Update; pulled the drive today and yes the seals are shot, but the bearings sound bad...Hoping to find your video on servicing the lower unit seals. Do you have one?

@daveg2712 5 лет назад

Just stripped the gen1 stern drive and need a full seal kit and new bearings, gears are good. Website please that will deliver to ireland

@jamespha9896 2 года назад

thank you

@cleanimag 2 года назад

Hey TC , loved the video! I have an old checkmate with a alfa1 gen 1 outdrive . Was winterizing it about a week ago and see gear oil leaking out of the weep hole of the lower unit that releases the water out . Alot of techs say just reseal the lower and your done . Please give me your thoughts 🙏

@boatyardboys1317 4 года назад

This is painfull to watch, .5 hour job explained in 1.25 hours. Good video for someone that is not a mechanic!

@myungjingo9528 4 года назад

Daniel Kratchmer oilgnh

@johnbristol1502 3 года назад

don't the gears have marks on them,how do you see to aline the gear marks up when installing the yoke bearing carrier?

@daytonasunset 3 года назад

I'm confused... what's the one and only correct torque to fit the yoke? Ones you said 4 and ones you said 70. And lbs ft or inch? I'm in Europe and have metric so i have to convert it... thanks

@bennyboy5642 2 года назад

Hi I'm working in my 5.7 ratio 1.47 kind of forgot which goes first spacer or shims tanks in advance

@oflores7457 3 года назад

Great video thanks

@sandromammi6483 3 года назад

Great video. Wish I found this before I paid someone to do this same job. While doing my upper he broke the bearing carrier retaining ring in my lower because he said it didn’t hold pressure. I’m left with an dead outdrive now. Do you have a video for a lower rebuild on a alpha one gen one also? I need to tell you though that my drive is actually a SEI 06 and yes I know they are lower quality.

@aaronmott818 3 года назад

I have a alpha one gen 2 is there anything different from this to mine??

@Alexander77745 Год назад

Какой длинны шланг подачи масла в колонку?

@Arcturian1111 Год назад

What would they charge for a job like this?

@jimtohmas898 2 года назад

without that spanner wrench you can'tremove it properly and you can't install itI always remove the upper bearing box when I'm doing U-jointsmuch easier to do and I also put a new front seal in you're right in there why not and you can look at all the parts close up after you clean them up to do a reassembly

@garycaradonna4323 7 лет назад

Can you use the same kit for a bravo 3.What are the 2 bearing number for the shaft?

@DesertRatFabrication 5 лет назад

Hi my 1994 alpha one which has 100 hrs. and is in very good condition is leaking blueish green oil on the right side down low just above the fin out of what I think is a vent hole, I think some seals might need replacing, what do you think, do I want to do the same thing you are doing in the video thanks mike

@richardluce775 5 лет назад

Early gen 2s were notorious for blowing the shift shaft seal. Replace with newer style ass’y. May have to change speedo adaptor also

@jameshoffman1190 2 года назад

Use 3/4 inch galvanized pipe to remove receiver. The OD will be a little over 1".....6 thousands.

@TMODCustoms 4 года назад

Thanks Wayne!!!

@CarlPrudeJr3 3 года назад

Good video. I'm subscribing

@DIGOLOGIST 4 года назад

I got gear oil leaking out my water intake holes on my Alpha 1 drive. Do I have to replace the internal seals like on this video or could there be another place it is leaking. Thanks.

@daveg2712 5 лет назад

Great video,

@AreAyQueue 6 лет назад

why not locktite on both seals? why do you use locktite on top and not bottom (upper seals)

@PatriotPlus179 4 года назад

Great video, but why didn't you have someone hold the camera?

@andya34 4 года назад

My upper drive oil seals have gone as its leaking oil from around the cavitation plate, I already replaced the quad ring but that did not work. My question is can I not just remove the vertical gears to get at the seals? Alpha1 bravo 2

@prevalenttruth 2 года назад

Hey buddy, My out drive lost it's oil and the gears ate each other. I am trying to rebuild it. I bought a new gear set but it is a different style than what came out of the drive. What is the process for shimming the gears when you have to start completely over with a new set? The housing and race all still appear to be ok because I shut it down immediately. Thank you very much.

@prevalenttruth 2 года назад

The drive is a alpha 1 gen 1 with 1.50 ratio.

@fstarockaburns425 7 лет назад

Hi - gr8 vid tx, quick question - replaced 2 seals on an alpha (one or two? doesnt have studs but thru bolts around lower/upper) today, but when we opened top both seals came out from above, nothing from the bottom. Kit came with 2 matching seals and one single one slightly thicker. We just replaced the 2 matching ones from the top, one with lip facing down toward the water/spline shaft and the 2nd seal on top of that seal with lip facing up toward upper gear case / gear oil. Did we muck sth up or miss something? I used permatex #1 hard/strong form-a-gasket instead of red loctite. held up 3-5 psi for a few minutes after the installation, just curious how you removed one seal from each side? At 24:16 - that ridge in the bore (after sand blasting) is where our 2 seals bottomed out from the top.. Thanks!

@philrazzi7782 6 лет назад

How do you remove the bearing? Mine froze up due to the oil leaking out through a bad seal.

@michaeldavies6814m 5 лет назад

Great movie!

@DevilsInBaggyPants1941 2 года назад

How much do you charge on a alpha one rebuild, on average if all is pretty standard sir?

@Chris-sx3he 4 года назад

I know you've offered up some amazing information but due to the camera not focusing and moving the camera around so fast I missed a lot of details. If you get a tripod please consider reshooting this video. It has to much good info to be wasted.

@libertyfinder4889 3 года назад

blurry af

@scottleasher5959 7 лет назад

I have a letter F stamped on my driveshaft that is bad. I do have another one with the letter D on it. I know the D shaft is off a V-6 engine. Is there a difference in these shafts? Can't tell by looking at them

@James-eq8fs 7 лет назад

The letter stamped on the Coupler End Yoke Shaft indicates the gear ratio of the Sterndrive assuming it is the original shaft and someone has not replaced it. The letter "F" indicates a 1.50 or 1.47 Sterndrive gear ratio usually found on boats with V8 engines. The letter "D" indicates a 1.84 or 1.81 gear ratio drive and is usually found on boats with V6 engines. Other that the letter stamped on the Coupler End Yoke Shaft all shafts are identical to one another. The only expectations are some MC-1 & R 1982 and older drives on inline engine applications used a shorter 8 1/8 inch yoke shaft. Other than that 1982 and older MC-1 & R drives on V8 applications used a 9 9/16 inch yoke shaft and all 1983 and newer MR/ Alpha 1 Gen 1 and Alpha 1 Gen 2 Sterndrives use the longer 9 9/16 inch long yoke shaft. The other expectation is most newer Alpha 1 Gen 2 yoke shafts now have an additional O-ring groove just behind the splines but the size and spline count are the same as other 9 9/16 inch shafts. See this link for a picture forums.iboats.com/filedata/fetch?id=7082896&d=1372098043

@sandyunderwood615 5 лет назад

I originally ordered a new seal and put it in the carrier and redid the two seals in the other shaft. My issue is that the new seals are double lipped and they make the shafts turn a lot harder. I can turn the shaft without a problem it just wants to grab that seal and I found the same with the new carrier seal. After putting it back together, it turns tighter than before but still has the right amount of play in the gears. Am I doing something wrong or can new seals cause it to be a little tighter? Regardless, I ordered new a new bearing set and had already replaced yoke, before I go crazy, if it is a little stiff with all this replaced could it just be some tightness on the new seals. I'm getting the metal casing seals with my new carrier that I ordered, wondering if I should just knock out other rubberized new seals that I have already installed.

@kubaSWAT 4 года назад

Hi Good video, where i can ger that graph with all the bearings seals etc ?

@reelnautee 5 лет назад

Great video. Wish you had a go pro.

@halitgunes5832 4 года назад

Tahnk you

@Phillv8 5 лет назад

Why did you split the uni joint? LOL made the whole job 10 times harder! Polishing up? lol

@joeschwenk4514 3 года назад

Easier to get to the nut to change the seal on the yoke pulling the u joint apart

@apollocreed2089 6 лет назад

Thank you so much for doing this! One question. When you torque the bearing nut to 70, I assume you mean 70 inch pounds.

@drizler 3 года назад

No way.🤬. ITS 70-80 FOOT LBS. I’m looking right at the factory book and irs spelled right out in letters so nobody goofs

@gunnerneikoify Год назад

That entire upper/lower unit is totally trashed with corrosion. I highly doubt it's mercathode system is hooked up or hooked up properly.

@bikeislife8405 3 года назад

Do you happen to have a list of all parts you used for this job? Thank you!

@libertyfinder4889 3 года назад

go to marine engine dot com , and you can find part numbers for all the items. then source them on ebay amazon, etc for best prices

@redflag5512 5 лет назад

Hi can you do this without removing the u joint in 2 different peace's instead taking off the whole thing out at once

@libertyfinder4889 3 года назад

yes, and it is not hard, if the u joints are good, do not remove them

@brentmcmahon8188 11 дней назад

Ball joint press

@pyrojoe1404 5 лет назад

Is there a way i can email or call you to ask a question?

@lawrence5017 4 года назад

Great vid. Question - i have gear oil leaking back into the bilge, do you think its the yoke thats bad?

@badbird8988 4 года назад

David, what did you figure out? I have same issue, I'm assuming it's front seal on the yoke

@lawrence5017 4 года назад

nick rigsby I did, it was the upper yoke seal. I also replaced the short yoke as it was corroded. Good luck.

@badbird8988 4 года назад

@@lawrence5017 thanks for the quick reply.. excited to get this thing back up and running . Is the seal you're referring to the one mentioned around 10:45

@lawrence5017 4 года назад

nick rigsby yes I think so. Mine was the seal from the upper outdrive where the short yoke enters the drive. It’s on the yoke that’s held in by the large castle nut that requires the special wrench.

@RxMixer 7 лет назад

Thanks for the video. Did you ever have to do the bottom end, or was the top side enough to fix all the complaints? Yeah, you really need a tripod and changing camera positions. I'll watch some of the COBRA videos although my son's boat has Mercruiser. Later...

@jsanchex5 4 года назад

take some Dramamine before watching!!!

@iThriveSeries 3 года назад

👍

@tommygreg8001 Год назад

He put the seal on wrong

@crisprtalk6963 5 лет назад

one word... tripod.

@boaterbil 6 лет назад

You need a tripod badly

@MattHagens 3 года назад

Camera shaking... need dramamine after 1 minute into video. I'll watch the rest when I get back from CVS.

@montanaior7714 3 года назад

I cant watch or I need to start drinking

@taffwoolsey9789 4 года назад

For the love of god, please stop putting everything so close to the camera! Nothing is in focus, great info but frustrating to watch

@dustinwooten3798 8 месяцев назад

Please invest in a camera stand before making a video.

@matress1 4 года назад

horrific camera skills.

@Mrgarrison151 5 лет назад

Really like your calibrated guns...... how about a torque wrench and a manual..... I hope you're not charging people for this shotty work...

@drizler 3 года назад

Corey Garrison I’m a torque wrench guy myself in certain applications. Still there’s only a few places that they are really needed if you’ve done a lot of wrenching . With 250 behind him he surely wouldn’t need one except as an occasional reference. Manuals really aren’t the end all be all people make them out to be. For actual work like this I get far more from a video like this than following a written procedure. Manuals are great for specs but omit much of the basic info they expect the mechanic to already know. That’s where these vids shine and manuals suck. Just my 2 cents worth.......