How To Replace The Impeller On A Mercruiser Alpha One Sterndrive Outdrive

I show you how to replace and change your impeller on your boat with a Mercury Mercruiser Alpha 1 or 2 Generation sterndrive outdrive. You should change your seat water impeller every two years to be safe. If it goes bad you can overheat your boat engine and be stranded on the water. We use a kit in this video with the Mercruiser impeller, gaskets, and o-rings. We show you all the tools we used to change the Mercury boat impeller.
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*ITEMS MENTIONED IN THIS VIDEO*
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[@mikecicero6177]

This is by far THE best video tutorial on this process that I have watched. Absolutely step by step details with clear and simple explanations. Great video quality and easy to follow along. Great job!

[@RyanUrlacher]

Wow, thank you! Ride safe & Ride Often! Check out this KZbin Channel as we have a ton of free videos for you! Check out our useful for purchase videos: www.lawabidingbiker.com/buyvideos BECOME AN ECXLUSIVE MEMBER-GET BENEFITS: www.lawabidingbiker.com/patreon Leave a flat donation: www.lawabidingbiker.com/donate Shop in the Official Law Abiding Biker Store: shop.lawabidingbiker.com Subscribe to the Law Abiding Biker Podcast: www.lawabidingbiker.com/app Join our free email club: www.lawabidingbiker.com/emailclub

[@IrishHamRadio]

Hi Guys, Great video and myself and my father used it to do this repair including the big conical seal on the vertical shaft… Just to mention though that the video doesn’t mention the bolt at the very rear tail of the unit that is undone when the silver plate comes off… We were banging and shaking the leg for 30mins until I looked up under there and saw the extra bolt needed to be undone! Even so, still a great detailed procedural video… thank you!

[@mattlabrecque186]

I'm at this stage right now. The lower unit does not at all drop like they showed. I've been banging on it with wood blocks, but finally gave up last night as I was afraid to break something. Like you said, great video, but not complete without this. It's good to see this in the comments. When I get home from work tonight, I'll check it out. Thanks

[@IrishHamRadio]

@@mattlabrecque186 Hi Matt, Yep I was almost breaking it too until I found that bolt! Please let me know if it was your issue too.

[@colingleason4441]

This comment needs to be higher! The video is otherwise great, but the lower unit won't come apart unless the bolt under this plate is removed.

[@yfzrider729]

Gets me every time lol

[@Barryfamily1]

Are you talking about the bolt at 17:51 and 18:20 in the video when they are re-assemblying?

[@terrymcdonald3388]

An excellent step by step process for even the person with no mechanical experience. Five stars for the very definitive replacement from start to finish.

[@MattProfa]

Incredible job, I wish every tutorial on KZbin could Be this thorough but also to the point.

[@beofile7]

I have this exact same boat. 1999 Bayliner 1850 with a 4.3l inboard Mercruiser Alpha One MkII. This boat has been so good to me. Now get this.... I am changing the impeller.........for the first time since new! 25 years man!!!!

[@tedhall7643]

Excellent video!! 5 stars!! Your step-by-step instructions saved me hundreds of dollars. I can't thank you enough. As you mentioned, the toughest part of the job was reinstalling the lower unit. Getting the splines of the lower unit to line up the upper unit was difficult. To assist with the reinstall, I used bungee cords on the prop as recommended along with a heavy dose of masking tape to keep the drive shaft and splines from moving during the procedure.

[@jkgtexas]

With over 24,000 views, its evident this is one of the best tutorials out there. Very good work and much needed content!

[@RyanUrlacher]

Wow, thanks!

[@spustise6424]

@@RyanUrlacher hey Ryan so quick question I have to change the impeller and I also had a leak of gear oil coming from the prop which I believe is my shift shaft seal. Is it hard to seal the whole unit while doing this and having it apart and do you have a video on how to do that. Thank you

[@jimakerlund3816]

I am getting ready to start this very project. Great video with no BS yapping like so many do. You got straight to the point about the removal and installation of replacing of parts. Thanks guys!

[@jeffwebb8208]

Excellent video. Clear and precise. No rambling on. Just very clear instruction. I love videos like this. Well done sir.

[@WunKoolKat]

I have done this before and no bungee is needed and you can rotate shaft as much as you want. When installing, just don’t force it and gently work prop back/forth a bit to align splines while gently lifting. It’ll mate darn near instantly.

[@cheapme1850]

Thanks! Definitely don’t have to worry about the shaft turning, in fact, it makes it easier to align the impeller key by turning the shaft.

[@kristopherbuchanan974]

Thanks for this!! i noticed they said not to move it and they stressed this, but they didn’t address what to do if it is moved. Sure enough, doing mine the prop spun and shaft moved even bungee’d so i didnt know how to proceed from that point. Same with the linkage… although i didnt move my linkage, it would be nice to know what to do for folks when things don’t go just perfectly. “Best laid plans” and all that.

[@gregschmitt1391]

I've done this many times on my old boat, and need a tutorial every time to guide me. It's always an adventure. No more adventures...this is the perfect tutorial on how to perform this service. Thank you and great job.

[@pushintheenvelope]

Whole heartedly agree! Took notes while watching and feel like this is totally doable, even for a first timer!

[@joshlaubach8166]

I have done mine years ago but this by far is the best video on it.

[@lasvegasjer]

The detail is amazing on this. I fix absolutely everything myself (unless it's something I need to pull a permit on, like electrical or plumbing additions on a house) and nobody does this detail. Thanks!

[@RobToz2011]

Thank you for this tutorial! I just bought a 1999 Sea Ray 230 Signature. After watching a few videos, I realized it would be a good idea to change the oil, the impeller, and the gear oil to ensure I am ready to go. I was struggling with what kit to buy until I found out I had the alpha gen 2. I watched quite a few videos until I found yours. This one is the most detailed. I got a quote to do the gear oil and impeller at close to $500.00 at my local boat service center. I will be taking this project on myself now.

[@RyanUrlacher]

Right on! Glad to help.

[@tjapkosmits8500]

Overall a very good video but since the unit is looking fairly well maintained and not that old here some extra checks for older units. The bungee cord is a good idea but once you put the lower unit back on remove the prop to check the propshaft for things like fishing line. When pumping in new gear lube oil you can also pump until the ventilation hole, close it and pump some additional oil in the system until there is a little bit in the reservoir. Than fill the reservoir. Note, not all outdrives have a reservoir or monitor inside the motor compartment. Important is to check while doing maintenance the status of your anodes and lastly the levels of your power steering fluid. (Cold and Warm) It can be a sincere pain in the ... to get well corroded oil drain plugs out. Do NOT break them. Sometimes the old gaskets from the drain plugs do not come out. Always replace old gaskets for the drain plug and check for the old ones. Important thing to check is the quality and color of the lube oil that comes out. This, to check if you have any water leaking into your system. Hope this helps. Again excellent video.

[@shawnmcknight5960]

Great video gentlemen…very easy to follow & step by step descriptive. I think someone else commented about the bolt behind the round anode plate (above the prop)…that took me…oh…about 2 extra hrs to find! If kit didn’t come with the sling seal gasket tool, you can just use the plastic gasket tube…it’s the extract opening size to place over the rubber sling seal to set it in place.

[@harveyroad6]

My boat overheated Saturday. Almost 325 hours since the last impeller was changed. We run mostly deep water. Thanks for this video. We are gonna tackle this job this week. Really appreciate you going through this. Not rocket science but lots of good advice here. Need to learn to do this as its a regular thing. Cheers.

[@RyanUrlacher]

You betcha. Thanks

[@k0rc]

As has been stated many times, this is a great detailed video and should help many folks take on this DIY project. I would add one caution to the instructions, and that is to not run the engine with the outdrive trimmed all the way up in the trailered position. It has been said this will cause excess stress on the gimbal bearings. That may be an "old wives tale" but it's probably better to lower the unit from the trailered position "just in case."

[@edmurrey911]

THis is the Best tutorial ever made for this task!!.Thank You for sharing with everyone.

[@jamess3532]

I follow your H-D content and couldn't be happier that you guys just happen to have the same boat as me. Stumbled on your video looking for a how to and this is perfect. Thanks guys.

[@gusquintana8661]

Thanks for the video! Just have to add as a newbie you didn't mention in the beginning the additional bolt that was there one you take off the plate. I thought my lower and upper were seal together shut so tried rubber hammering it and broke the lower unit flat plate. Had to get it welded and fixed wish I had know as you mention that bolt t When putting it back on. Learning experience for me

[@sherrycook3581]

@@gusquintana8661 that's what happened to me too! I thought it was just because the boat is a 1985. I didn't watch this video first, but the stern drive is a little bit different with only 5 bolts.

[@ThomasT1976]

Best video on YT on this topic. Thanks a lot! I saw another clip where they used the oil pump to fill oil bottle in the engine room from beneath getting rid of the air in the pipes.

[@michaelking42]

Do you mean they kept pumping right up past the vent screw and continued pumping into the reservoir? That sounds like a smart move.

[@ThomasT1976]

@@michaelking42 Exactly. I did it and it works 🙂

[@michaelking42]

@@ThomasT1976 Awesome, thank you. If I remember, I'll do that too. I do want to flush my oil out when I get to doing the job.

[@AndrewMcGovern]

Great video, very helpful. There were a couple mistakes. Some of the gasket sealant was in the wrong place (not a big deal). But, DO NOT lube the face seal or shaft when installing. They should both be totally clean when installing as the friction fit is supposed to hold the seal in place. Only a little grase on the housing to allow the seal to slide when rotating.

[@macmac3770]

Man, Lurch and Scrappy doing it all! It’s a good thing Lurch has retired and can be the “wrench man” and allow those great video shots. Very nice. Be safe out there on the road and on the water brother.

[@RyanUrlacher]

Thank you!

[@Terry-7]

Fantastic video guys! Thank you so much for the in-depth explanation of this process, I feel much more confident in giving this a go myself now.

[@johnpost9524]

It took me most of the day but your step by step was successful.

[@RyanUrlacher]

Glad to be of help. Ride safe & Ride Often! Check out this KZbin Channel as we have a ton of free videos for you! Check out our useful for purchase videos: www.lawabidingbiker.com/buyvideos BECOME AN ECXLUSIVE MEMBER-GET BENEFITS: www.lawabidingbiker.com/patreon Leave a flat donation: www.lawabidingbiker.com/donate Shop in the Official Law Abiding Biker Store: shop.lawabidingbiker.com Subscribe to the Law Abiding Biker Podcast: www.lawabidingbiker.com/app Join our free email club: www.lawabidingbiker.com/emailclub

[@6mcampos]

Great video! Straight to the point and every step was right on. I got this done today in less than two hours because of this video. Thank you!

[@RyanUrlacher]

Great to hear! Glad we could help. Thank you for the positive commment. Ride safe & Ride Often! Check out this KZbin Channel as we have a ton of free videos for you! Check out our useful for purchase videos: www.lawabidingbiker.com/buyvideos BECOME AN ECXLUSIVE MEMBER-GET BENEFITS: www.lawabidingbiker.com/patreon Leave a flat donation: www.lawabidingbiker.com/donate Shop in the Official Law Abiding Biker Store: shop.lawabidingbiker.com Subscribe to the Law Abiding Biker Podcast: www.lawabidingbiker.com/app Join our free email club: www.lawabidingbiker.com/emailclub

[@supergenius112624120]

Awesome video! I use a plastic knife to remove the orings, but it is pretty low pressure, so metal is probably good too.

[@emagee7864]

Thank you, I feel confident about performing maintenance on my outdrive. Excellent work and narration.

[@TomO-rt3fg]

GREAT video - thank you. FYI - for the gaskets, it looks like the merc manual recommends Aviation form-a-seal gasket maker (e.g., Permatex 80019), *not* the Permatex 80007 you show in the video... And I also struggled to get the lower unit off before I figured out there's another bolt next to the anode above the prop... :)

[@Omovalley914]

Nicely done !! I just might try it now I've seen it explained so well. Thanks for no dumb background music!!

[@davidpettit2885]

ha! hate when so much background music is added. just show me what I came to see

[@kristoffscuba5466]

Excellent breakdown of the job. I have a question about the grease used at 11:55. It looks like you are using a waterproof lithium based grease. If so I would suggest that this is the wrong grease. Its fine for metal to metal use in marine enviroments, but it will eat away at the rubber impeller if used as you do here. I would use a red rubber grease instead or you could also use Evinrude tripple guard, which is safe for use on seals, o rings and rubber components.

[@bobatbilletcreations]

Wow, What a GREAT job on this video, Thanks for sharing guys! I will be doing mine tomorrow. Your video couldn't be any better!

[@RyanUrlacher]

Awesome! Thank you!

[@wphun]

Fantastic video, Ryan. Shoulda watched the entire thing without beer and I woulda had less trouble

[@EvolutionDIY]

Great Video. You make it look so easy. Just acquired an old 1991 Bayliner Capri that I have no idea when the impeller was last changed. Think I’m gonna tackle this soon. Thanks.

[@autoshotty]

Good video for reference. Please make sure your outdrive is in it's down position before running the engine. Your u-joints and coupler will thank you.

[@mgallegos1119]

Another great video man! I'll be replacing my impeller this weekend.

[@mikef4462]

Got it done using this video! First timer, Thanks.

[@roykalil6298]

Ryan, as usual the best tutorials on the web. Thank you for taking the time to share your knowledge to help your brothers and sisters accomplish these jobs and save a ton of money along the way. I also have a question about the orange "O" rings, is HD getting into the boating game now?? LMAO! Thanks again Ryan and Lurch!

[@H3STROU8LE]

Excellent detailed video. Glad I watched your video before doing the job.

[@LowkeyBuns]

Our engine had one “5/8th” bolt straight up from the anode (under the plate that was removed) at 5:16 in the video.

[@HermiloVega-g5l]

Im needing to replace my impeller and this video is excellent help, thanks boss 👍👍👍

[@larrypierce4333]

Great job on the video!!! Very detailed and easy to follow to do this task!

[@deep6predator1]

thee best video on water pump replacement, bravo bravo excellent

[@morpheusbug6358]

Great video. Love the step by step and commentary for explanation. Thanks so much!👊

[@johnmiller4553]

THE BEST QUICKEST INFO VIDEO …. EXCELLENT JOB BROTHER 🤙🤙🤙🤙🤙🤙🤙🤙🤙🤙🤙

[@bvb1132]

Very informative!!! Best video tutorial on this process.

[@oopydoopy33]

Great video! Everything explained with needed details and advice! Thank you!

[@dougringle262]

Best repair video ever!

[@rmag7760]

Love the video! Very easy to follow and made it very easy to understand.

[@juliopelca9385]

Man!!! great job 🎉🎉explaining everything I just got a 1989 old boat and I don’t know if they ever replace the impeller I my have to do it my self thanks so much for the vídeo it will help me a lot😊

[@christhomson5669]

Hey thank you so much,great video. You definitely saved me a few bucks. Big thumbs up

[@mikem9854]

Dude this is awesome I’ve never seen one of these videos so detailed. Thanks!

[@RyanUrlacher]

Glad it was helpful! Ride safe & Ride Often! Check out this KZbin Channel as we have a ton of free videos for you! Check out our useful for purchase videos: www.lawabidingbiker.com/buyvideos BECOME AN ECXLUSIVE MEMBER-GET BENEFITS: www.lawabidingbiker.com/patreon Leave a flat donation: www.lawabidingbiker.com/donate Shop in the Official Law Abiding Biker Store: shop.lawabidingbiker.com Subscribe to the Law Abiding Biker Podcast: www.lawabidingbiker.com/app Join our free email club: www.lawabidingbiker.com/emailclub

[@scatsam7566]

Great video. I forgot to put the face seal bushing back on when I installed the lower unit. How important is that bushing? Really don’t want to take this unit back off again. Thanks

[@jeremygellis]

Very helpful video thank you the only snag I ran into is I actually had an extra nut that was 9/16 that needed to be removed where the one anode was before the unit would separate from the upper.

[@ericdishington428]

Great video. I have Alpha 1 Gen 1. A total night mare reinstalling. The shifter shaft is loose up above, unlike the fixed L shaped shifter shaft on the Gen 2.

[@wolfsssantacruz5945]

Great video. Makes me more confident that I can work on a boat when I buy one soon. I would trust you more if you had snap on tools though.

[@georgelebel812]

😊nice job It was well done i will now feel comfortable to do it my self thanks guys

[@JeremyWaite]

Thanks for the perfectly detailed video from start to finish. This is the best one I have seen on KZbin so far. I am doing this project today so this video helps a ton!

[@RyanUrlacher]

U betcha!!

[@wernerostwald287]

Thanks for this excellent video. Professionally done!

[@350mphmedia]

Outstanding tutorial! Thank you very much guys!

[@jordanmcclelland816]

Great video well explained and very detailed

[@t0mmy91]

wow, what a great video, thankyou! im doing this today with your videos help.

[@davidpettit2885]

great video. perfect detailed steps and explanations

[@heavymetalpeterson]

Top notch video, thanks guys. Keep `em coming!

[@snowy3375]

I love the way you explain everything so clearly. Thankyou. Is there any chance you are gonna do any videos on Cleaning up or servicing the carburetor. 😊

[@franciscogomez5260]

Great video follow the instructions and you will have success.

[@tyrobinson7848]

Am I the only one that missed them taking the 9/16 head bolt that’s hidden under the anode plate off? My lower unit wouldn’t come off until I found that bolt. I didn’t notice them taking that one out on the video.

[@jakesdroidx]

They forgot it. I was fighting it for a few min trying to figure out. Then I went into videos of stuck lower units and found the bolt haha

[@oopydoopy33]

Excellent video! But, you forgot to mention the removal of the hidden bolt under the anode plate. I see that you mention putting it back, but not removal. The lower unit will not budge until that bolt is removed.

[@Arcturian1111]

If you accidentally move the prop shaft, is it a pain to align it back in? And if so what is the method? Do you spin the prop till it aligns again?

[@DigginwithSeven]

Great step by step tutorial

[@jw6353]

Thanks, Dudes. Since watching your video, I am now willing to attempt my lower unit. I have to agree with everyone else. Best and to the point. Just planning ahead, have you thought about a gimbal bearing change-out? I bet I could do it after you guys made a video. Thanks again for this vid

[@treefal2552]

Thank you very much for the video sir. Family can get out on the water now

[@RyanUrlacher]

Awesome!!!!

[@ShirleyAerial]

Great video. Now I can confidently do this on my own. Just got a new boat and I put muffs on it and no water is coming out through exhaust holes after 2-3 min running so I am assuming stuck impeller. Boat sat for 2 years prior to purchase.

[@TomOwenVids]

Excellent Video and highly motivational. I used the link, bought the impeller kit and awaiting delivery. 2 questions: I like the chalking of the prop so it goes back in the exact same way it came out. It looked like there was just enough wiggle in your setup to need slight adjustment to put back in. A) Would it make sense to wedge a block between the prop and lower unit and bungee/secure in that immobile state? B), even though your method was slightly out of alignment, it appeared the little wiggle wasn't too much of a problem or hassle. Perhaps A) is not as important if the wiggle is so easy? Thanks for the info! /to

[@onlydhufish307]

Excellent video. perfectly detailed, thank you very much.

[@RyanUrlacher]

Glad it was helpful!

[@-d-e-m]

THERE IS ANOTHER BOLT ON THE ALPHA 1 GEN 2!! I THOUGHT MY UNIT WAS SEIZED... BUT IT HAPPENS TO HAVE ANOTHER BOLT TOWARDS THE FRONT THAT YOU REACH FROM UNDERNEATH!!

[@estecks]

Excellent video! I have the same outdrive, approx how much 90 weight gear lube did you need to refill it? And does it have to be Mercury or Quiksilver brand? Thanks!

[@jodete987]

Thank you for sharing ,how do we notice when the impeller is bad?

[@michaeldavis1659]

Excellent video, thanks a bunch

[@lonniemaize6718]

Thanks for the video! Just enough detail, without having to hear about your granddaughters birthday party lol.

[@maciekmiskiewicz8704]

Best video, thanks, Why do you turn on the forward gear before replacing, I do at idle

[@tonyaudet6575]

Great write up. Really nice.

[@sthrallday]

Superb video. Thanks

[@jaredhardin5315]

Absolutely great video do you have one for rebuilding that lower unit. But this video is perfect 👍 thank you so much!

[@piazza1129]

Crystal clear gentlemen👍🏼

[@jessemidgett1648]

Note the removal of the 1/2" head lower screw under the zinc plate- it has to be removed from the bottom. You can leave the top screw hanging in the hole above it if you want as mentioned. If your unit is not coming off, get a deadblow and some putty knives and screw drivers and work it off. Kroil in the crack as you go. Mine was stuck on the forward aligment pin, but the lower unit came off after a pretty good fight.

[@jeremyinvegas]

I wish I had read the comments. This is a great video, but some models have the extra nut. My 1995 Searay has that extra nut under the zinc plate also. Luckily I didn't beat on it too hard before my nephew saw that nut. This could have been a catastrophic miss. Mercruiser 4.3 Alpha One Gen 2 lx

[@jeremyinvegas]

Ps. Thanks for commenting to help

[@Mihalyofficial]

Thanks, is the gasket sealer really necessary?

[@paulolson8690]

I made a mistake and moved the shift linkage and tried to line it back up but was off a bit and forgot to double check it. I bolted the two units back the together and caused an issue with two shift linkages. I dropper the lower unit a bit and realigned it back up but they would not go back together. One of them moved in or out. So, I used a pair of pliers to squeeze them back in place. Will I have in issues with my shifting? I would add, make sure these two are married up perfectly before tightening up the bottom unit. Other than that pretty easy job.

[@Oicu812b4y]

It's fine if the shaft rotates but you can only rotate it counterclockwise to line it back up or it will shift out forward and into neutral and your linkage will not line up

[@kristopherbuchanan974]

⁠@@Oicu812b4ythanks for this. Not totally clear exactly what ya mean but counterclockwise sounds key. Can you spin it all the way around counterclockwise? (Multiple times if needed because over shot the mark)

[@hollywood93c87]

Boat repairs awesome, I love our bay liner ✌️

[@RyanUrlacher]

Thanks!

[@ericr5561]

Thank you for this video! Cheers

[@ericb5147]

You mention there is a bolt under the plate to contend with but removing it isn’t in the video. I thought the paint was acting like a glue preventing the lower unit from separating but it was the bolt you mentioned but didn’t show removing. Otherwise this video saved me tons of cash!

[@johnhart686]

Please do one on changing bellows and shift cable gasket

[@Andyman21643]

Any chance you guys made a video for bellow replacement?

[@Arcturian1111]

A Greatly Detailed Video, tops on KZbin so far. It seems putting the lower unit back with the spline alignment is the hardest part. I have a Generation One Alpha which I'm going to do shortly. Question: , is it easier then the 2nd Gen to replace the impeller?

[@Arcturian1111]

And I subbed you guys.

[@eg6sivtec]

Very informative! Thank you sir!

[@FinanceMan]

Thank you for the guidance!

[@richardluce775]

When tightening impeller housing make sure it is centered on shaft it can in some instances actually rub on shaft. It will howl badly and damage housing and shaft. There are guide pin tools available but if your careful you don’t need them.

[@roberthughes66]

Awesome video guys!! 🤩🤩👍

[@aaroncovell3152]

Great video. From other videos I've seen after the gear oil starts coming out of the vent hole they close it up and continue pumping until its flowing into the reservoir to purge air. Do you think this is necessary ? Also should you trim the out drive down before starting it?