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Mercury Outboard Lower Unit Rebuild L4's & L6's
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- čas přidán 10. 06. 2018
- Had 3 bad lower units for the 66 cubic inch blocks. Took the best parts from all 3 to make 1 strong fully operational one. I used a lot of basic tools to get the job done as seen in the videos. Some techniques orthodox and some not so much. Enjoy.
Best camera girl EVER!!! Thanks for the info!!
Luckily she accepts payment in the form of cheetos and gummy bears. 😅
@@MerCSonL6 LOl. She was great!
@@MerCSonL6 i need mor info of mercury 850 850 85hp engine
@@josemendez6355 what info?
I’ll tell you what sticks out to me the most is dad and daughter working on the boat motors! That is awesome man! A lot of fathers don’t spend time doing things with their kids and they grow up resenting one another. Better believe my two & threeyear olds are already trying to stay in the garage with dad doing any kind of “work”!
Love it my friend. Thank you. Son
Interaction with his daughter is awesome! There should be more Dads like that. Great info as well.
Thanks 👍
By the way I do want to thank you for the video's they make life so much nicer being able to work on things myself an saving money doing it myself. And your camera girl well she"s by far the best camera person ever. Give her big hugs for the awesome job she did. Have a wonderful and blessed day. Trooper
Nice straight forward tear down and assembly. Your little camera operator was spot on too!
You need a boat parts sponsor to this channel.
Love to watch you rebuild the whole gear drive from scratch using all new parts..
Thank you! I appreciate ya!
Getting ready to tackle this project on my 1990 Mercury XR4 150. Your video is very helpful! Liked it and now a subscriber! Thanks so much!
i have a 1970 1350 that no one is interested in working on in the uk, so your videos are important to me .. your awsome . thanks for the help
Thanks for the info and camera work on the shift mechanism for neutral, forward/rev. I pulled mine apart and was having a hard time getting it lined back up correctly.
Patience. Son
Your Lil one stole the show so cool I like it good job dad better get her on pay roll for sure
I don't know what's better you fixing that or her doing her thing so so cool
Great video, the end made me smile, best camera in the world right their.
storing an outboard outside in the winter in the trimmed up position, they can fill with water from rain, freeze and crack. I try to remember to dump a little antifreeze in them or cover the lower unit from weather.
Great video and so glad I found your channel. I'm somewhat new to outboarding and I just purchased my first "project boat" with a 1975 Mercury 850 outboard. When I took possession, the prop and the prop shaft and carrier (as well as the clutch dog and reverse gear ) were totally separated from the lower unit (in one piece) and lying in the hull of the boat. Upon examining it, I noticed that there were cracks in both the carrier and the carrier retaining nut as well as a large chunk missing from one of the prop blades. I don't know what happened here, but at least I'm hoping that I might be able to fix it myself after watching your video. Thank you so much for uploading it!
Looking good..
Better than new.
Oh man ur the man I'm still watching
Hi my name is Jose Mendez I learned from your work
Man you daughter made my heart smile!
Thank you. Ditto my friend. Son
thank you for your help your vids are awesome
Bilginize teşekkürler
The only portion of the procedure I’m having trouble doing is the part you completely skipped over in your video 😂 From viewing the empty foot to installing the nut. I’m going to assume because like myself, it’s taking forever to wiggle back in place and it was carried out during little girls nap lol cute though. My twin 4 yr old boys want to help with everything daddy does to our boats and motors too 👍
Lol, I tried to multi task my friend. Obviously, it didn't work out 😅
Nice shimming gears, and tightening bearing carrie nut which is tighten to 200 foot pounds
Thank you sir
Lil' Miss, Dad's shirt says L6Outboards.
High five!🖐🏻
Hi come to Greece and you will have so mush work on lower units if you prefer that will make you rich. GOOD WORK.
I sure didn't know you did this! Amazing!!
It would be great to get also your setting for backlash. but thanks for the video. very backyard do with what you got and get result. I can appreciate that. Please video of it running.
It's been on my fishing boat now for several years. No issues. Backlash was already set as the shims came out during the rebuild. Thank you. Son
Can you do a video on how you used the torch to take that prop off? I have a prop in the same situation.
Looking to hopefully start working on my dad's 1971 1150 Tower of Power. I have the book, but need a good resource for tools, parts, etc. Figured here would be a good start!
I'll help in anyway I can. As for parts Oldmercs.com and Ebay are good resources. Let me know.
Teddy Tiger.
Great way to fix your motor and I have the same issue my clutch dog is not engaging in reverse my motor is 1983 70 HP if you can tell me where can I get one to fix my motor I’l appreciate it thanks
1983 70hp should be an L3 if I'm not mistaken. Does the engine engage in Forward and Neutral?
Hi, I have pulled my 115 HP straight 6 merc 1987 model apart.. Is was stuck in forward gear.. FOund the drive shaft bearing no good with a wobbly drive shaft. It all came apart rather easy. I did how even find 3 ball bearings which i presume come from the gear shifter... when i turned the shifter shaft it did not click nor lock into place... Any sugestions
Hey Son, What prop would you use on a 1985 T of P 115hp that is on a 18ft center console cuddy cabin fishing boat? What pitch would you use.
I have an 87 mariner 115hp in-line 6. I cannot get the prop shaft out. Bearing carrier is out, but prop shaft won’t come out. It rotates easy but won’t come out. Any ideas ??
It's gotta be rusted in there. Try soaking it in vinegar for a few hours. Son
Hey how did you put the carrier back in? Does it slide in or do you just tap it in with a hammer?
Slides in..... don't use a hammer. Son
thanks for the video. how much needs to be disassembled to reinstall the shift cam on the shift shaft? i pulled the shift shaft not knowing i would loose the cam on the end. i am working on a 1988 mercury 100 2 stroke that looks slightly different as mine has two nuts holding the carrier to the housing.
The shift shaft is splined. You just have to line it up. Son
@@MerCSonL6 thanks. I got it back in. Drained the oil so I could see and moved the whole unit to get gravity to move the cam back in place
My l3 I just replaced the impeller in it. And then removed one day on the lake because it picked something up. I had yellow oily substance all in the neck, on water pick up tube and everything. Is this caused by the seal way under impeller or on prob side? Than you, have helped tremendously. Also when I take the lower off at the front there is what I think it to be a breather. Is there supposed to be something on that?
Sounds like gear lube is leaking up from somewhere. Only 2 areas are the shift shaft seal or the water pump pump base. May need new seals. Let me know. Son
I guess The question I'm try to ask with a cam flower is at is there a cross pen and compression spring behind it look like it was just a can flower sitting in the prop shaft
There is a spring that pushes the cam into the shift cam. Best to keep the shift cam in neutral and manually adjust as needed. If I recall correctly the torque on the carrier is around 200lbs. Son
So wait there's not suppose to be water? What seal prevents that. I need a full breakdown of the lower unit please
Enjoyed the video just had a question when you put the bearing case and out the pin that's in the front the cam flower I noticed it was still in the prop shaft was there a cross pen or a compression canned flowers spring in there
I'm not sure what you asking. Son
i am doing the same right now, wondering if you can lead me through this with some manuals especially parts names and sequence of rebuild please.
Your camera person is awesome 👍 I do however have a few questions that weren't really explained, can't you just use a dent puller to remove that whole shaft with the bearing and gears attached?
Which way does the shift cam face? I know which slots are forward, neutral and reverse but which side faces the top? One side has a stamp from Mercury. This is a 96 Mercury 115 ELPTO 2+2. I already installed it but I’m sure the cam is upside down because I’m struggling to get it to work. Does the slide linkage have to be pushed all the way back when lining up the upper shift shaft in forward?
It has to be torque to 200lbs into neutral. Son
hey man finally got my motor running great! went out for a ride day 2 the forward gear broke a punch of teeth, bad clutch and reverse doesnt look great either. Do you have a good person for a lower unit thats already rebuilt. or is it better to just replace the parts and re seal it up. never rebuilt a lower unit wondering if i do go that route do i have to buy all new shims too or can i just throw the new gears in. also the pinion looks good should i also replace that cause id be putting all new gears in? Thanks for all you help.
That's unfortunate. Your gears will need replaced. Probably cheaper to buy a whole new lower unit. Son
This video is super helpful - What does it mean if your lower unit has a VERY short throw between forward and reverse? In the process of a impeller change and finding its not going back together all too easy. I am also noting that the prop shaft will *click* and rotate in forward direction but give resistance in reverse in both forward and reverse, is that normal clutch dog action?
No, perhaps the torque is incorrect or you have a worn clutch dog. Son
@@MerCSonL6 putting a wrench on the clutch dog and rotating through the gears a few times loosened it right up 👍 now onto fixing a rough idle !
I have a 68 1250 thunderbolt and I’m having problems with the setting for the shift cam selector. Anyone have a video about installing the lower unit with the proper cam position?
The only video I can find was for a different motor and when I followed his instructions it made my forward and reverse backwards.
czcams.com/video/lvfAWrE7xv8/video.html
This might help. The shift cam spins universally. You just have to determine the forward, neutral, and reverse settings. The cam pushed down on the spring. The prop spins freely when in neutral. Hope this helps. Son
Ok I did what you told me when I put the gear in reverse I can turn the prop by hand in both directions so this means the clutch or the reversing gear is bad also the crown Burt is made of fiber not metal and when I tried to tighten it I brook one teeth that where the locking tap sets in between so what do you advise get the clutch and reversing gear or get the whole lower unit from whole sale marine or buy a whole used motor there is one in Florida and one in California for about 2000$ plus shipping
I'm sorry to hear that. It was worth a shot. There are 3 options:
1. Take the lower completely apart to properly diagnose the issue and rebuild it.
2. Replace the entire lower unit
3. Replace the entire motor
The top 2 are the best options. Option 1 will be the most economical. Option 2 is the easiest. Option 3 I dont recommend unless you really really want to spend $2,000...... Let me know.
Are the lower units interchangeable between the 850, 900,1150 and 1500 mercury L6 motors?
Yes. Gear ratios are different but can be configured with the correct pitch. Son
I have a quick question that maybe you can help me out with. I have a 74 or 75 mercury 650 3 cylinder and the carrier bearing retaining ring threads are stripped on the lower unit. I looked into a fix but haven't found one so now I'm looking into a replacement lower unit. My question is what lower units will interchange with mine ie years, 650,750,850? all the parts are fine so I should be able to swap them over to the new used lower unit. so does shaft length, and gearing matter?
They are all interchangeable. Son
@@MerCSonL6 Thank you for you your help.
Son, love all your videos thank you!!! I have a 71 800, was wondering I have my metal shifter cam out and noticed there is a rounded and a flat side. Do you know which way goes down or up on the shifter? I bought a kew shift cam but am afraid to use it because it appears different from original... thank you....Gabe Canon City Colorado
It's positioned exactly how it is in the video my friend. Son
Son, You're the Man!!! Sending the video I can see what side needs to go down.
HI, excellent video. I have a problem, maybe you can help me figure what it is. I have the lower unit of a Mercury 90 Hp 2 stroke, pulled down, and no matter what rotation I do to the shifter, the prop is stuck in forward, no nuetral , no reverse. What do you think the problem is?
Are you able to do a 360 with the shift cam?
@@MerCSonL6 The shifter turns 6 turns to the right and to the left, but definetly not 360 degress. No matter where it is, left, right , center, the prop is stuck in forward.
Your shift cam is likely out of alignment. There should only be 3 turns: Forward, Neutral, and Reverse. Each turn you should hear the cam follower/clutch dog pop into place if it is doing what its supposed to do. Only way to truly verify is to disassemble. Son
You need a bearing carrier tool. Not to expensive on eBay. The bearing carrier nut needs to be torqued to 210ft/lbs to keep the carrier from moving when assembled.
I agree. Could not afford 1 at the time. Had to make due with what I had. Thank you for your input! Son
@@MerCSonL6 Agree, at 150 bucks for a tool Im only going to use once is unreasonable.
Do you need to silicone the flange nut? That's the one you were tightening up with screw driver and hammer. Or can you just screw it in and pull the tabs up? I'm there right about now on my mercury.
It is recommended to use a Perfect Sealing Compound. I used ultra copper by permatex and haven't had any issues. The idea of the Compound is to provide a perfect seal in which the crown nut will not come loose. The tab washer also provides the same. Hope this helps. Let me know.
Thanks! Did you do the same thing to the seals too?
@@PacificNWfishingadventures on the O ring inside I only lightly coated with lower unit gear lube. As you tighten the crown nut it compresses the seal and expands it. Is this the seal you are referring to?
Sorry, I meany meant, yhe seals that you tap in.
@@PacificNWfishingadventures Yes sir. If I am understanding your question correctly.
How do you remove the drive shaft out of a 96 60hp mercury
Remove the drive shaft from the lower? There is a pinion gear ⚙ and and nut that holds everything in place directly beneath. It's torqued so it will take effort. Son
I have the 87 mariner 115.
What lower units are compatible with it ?
Anything from the early 70s to 88. Gear ratios are different but you can work that out with the prop
Awesome Video! Thank you!! Ive got my 1500 150hp taken apart. Starting to put it back together. The Cam Lobe and Pin were worn down so I replaced them. I have all the parts in correct but there is 12mm of movement on the Prop Shaft going in and out. The bearing carrier looks like its all the way in. But maybe not. The key appears to be at the bottom of the cutout, odd. The Retainer isn't on yet - need to but a new one. Im getting worried something is wrong. Bought the motor recently, Runs good. But I never checked FWD/NTL/RVS on it. GRRRR. Any ideas" or is this normal without the retainer in yet? Bearing Carrier doesn't move.
Thank you sir. The retaining nut is what pushes the carrier into the correct position. Their should be not be any play on the propshaft. Install the retainer incrementally and check the functionality of forward, neutral, and reverse. Hope this helps. Let me know.
Dr MercSon L6 Outboards THANK YOU SIR! WILL DO!
I thought I tapped the bearing carrier down all the way. Maybe not. Lol. I'll check it tomorrow though. Thank you!
Thank you Sir Doc!! You were correct (as if I questioned it) lol. My next issue is on the shift shaft parts. Three plastic parts on the shift shaft to (I guess) prevent the reverse from either over driving the reverse pin? Or keeping the reverse gear engaged. The parts list manual I have doesnt even show them from what I can see but every video I've researched doesnt explain their orientation or describe the correct installation of them. I have all 3 plastic parts and tried many different ways of putting them in and i cant seem to figure it out. Lol. These go on top of the shift shaft seal. Any help would be GREATLY APPRECIATED :)
Dear, your video contents are very good but why you are not getting your expected views?
I don't do this for attention. I do it to help people. Thank you for the kind words. I'm no director by any stretch and get heckled for it. Buts it's alright. I am still going to produce and make videos regardless. Son
Hi it’s me again when I get the lower unit out can i rebuild the old clutch dog and or the reverse gear if I have someone that own a machine shop I wants to help me doing that?!!!
You can.... it would be extremely difficult but not impossible. I can likely find you the part you need. Firstly, we need to properly diagnose why it's not shifting properly before beginning the search for parts. Take it apart and email me pics to DrMerCSon@gmail.com... I will help you and tell you what you need.
Thank you so much I will let you know and work with you to get this fixed.
i am replacing the forward and pinion gears on a merc 800 lower unit. every time i tighten the crown nut the drive shaft begins to bind until i back the nut off. any idea what could cause this?
Bind up as in the crankshaft doesn't rotate? Check to make sure the gears are lined up. Also, there's 2 types of gears for these lowers. One for the preloaded pin at the top of the crankshaft and one without. They are not interchangeable. Also check to make sure the shift cam is in the correct position. Let me know. Son.
@@MerCSonL6 it sounds like i have the wrong gears. As the bearing orientation on the 2 drive shafts (the shaft that goes from the lower unit to the crank) was different. If i use a matching set of gears from the preloaded type will they work in the gear housing from the preloaded?
@@billkrummel8590 that is correct. Son
@@MerCSonL6 are the gear housings different? or will the gears work in either if they are a matching set?
@@billkrummel8590 gear housing is universal for the L4's and L6's (4.25 gearcase). Only difference between L4's and L6's are the gear ratios. Let me know if you have any more questions. Son
Why do you put silicone on thread just wondering
To seal it. Son
I have the same problem. It won’t engage to reverse. Where are you located?
25401
Is there any kind of part number for the bearing carrier assembly and crown nut? I can't seem to find anything for the mid 80s 115 TOP
I'm not good with part numbers. The L6 bearing carriers where all exact depending on where you got it from. Company's switched serial numbers so we would go to a dealer and shell out cash. As far as I know, with the exception of gear ratios, all intermediate lowers used the same diameter till 1988. Son
@@MerCSonL6 I appreciate that. Luckily I found one thanks to some members in the enthusiast group on Facebook. Been watching your videos and scrolling through the group and yall have helped me tremendously with my TOP
Add me to this Facebook group you speak of. I have an 87 Mariner 115hp. I have lower unit questions.
@@rickbokern4179 Mercury Inline 6 Enthusiasts
my lower clicks at the prop in the neutral position you have to turn it slightly toward revers. is my shfit cam to worn out?
I would pull the lower and manually shift it into N. If it clicks either your spring or clutch dog is worn-out (supposed to look like a sharp bullet which pushes into the shift cam). In my experience i have never seen a shift cam wear out. Lmk. Son
@@MerCSonL6 yeah clicks even off the engine.
@@eagerweaver lower needs rebuilt or replaced unfortunately.
@@MerCSonL6 can you please come tell that to these people in this L6 enthusiast group they are convinced the shift shaft is misaligned 😂 thanks, buying a known hood one now
You can try loosening the carrier by turning the crown nut counter clockwise until it does not click as a bandaid. (That will move the clutch dog back). Eventually it will need repaired tho. Son
Got a Completly bondo cracked up lower that is stuck i need to find good lower case and i want to rebuild or seal if good... your video did skip the seals part ...good video tho..im working on a 1986 Merc 115 ToP
czcams.com/video/lvfAWrE7xv8/video.html
I go over seals in this video. Son
I am not sure if it’s L3 or not how can I find out. And yes it engages in forward and in neutral
I'm pretty sure it's an inline 3 cylinder. It should have the "clamshell" cowling. It has the smaller gearcase when compared to l4, l6, and v6's. If its shifting from forward to neutral then the shift cam is likely doing what it is supposed to be doing which is good. The clutch dog could be worn, reverse gear worn, or bearing Carrier is off by a fraction. I suggest loosening the tab washer that holds crown nut in place and tightening (clockwise when looking into the gearcase) an 1/8 of an inch at time checking incrementally if/when the reverse gear engages (be sure shift cam is in reverse position). Use a wrench to shift the shift shaft. Note: it only turns about and 1/8 inch and should "pop" when the shift cam goes from Forward, neutral, to reverse. Hope this helps. Let me know.....
Thank you for taking the time to reply I will try this on Saturday and I will let you know and if it did not fix it can you let me know where can I get whatever it needs to fix the motor to do what it supposed to do?!
@@homarkbeer absolutely. I would try that first before taking the whole lower apart. If you take it apart you would have to try to locate a clutch dog and/or reverse gear which can be pricey new or difficult to find used. You would also have to potentially replace the crown nut, prop shaft seals, and carrier seal as well. It's hard to diagnose without seeing/hearing exactly what your lower unit is doing while shifting. It is common for the reverse gear and clutch dogs to wear from slow shifting. Hopefully in your case the Carrier is just off by a few thousandths of an inch. Ideally, that would be the best case scenario. Good luck and let me know. Son
The unit that you blown off the prop from. It's the one on the table. What is that rubber thing on the shaft and does it come off? For I have a 64 Merc 650, and I took off prop and have the same rubber thingy and need to know how to get it off for it looks like it is all ONE CONTINUESS CONNECTED THING to the gear housing. It's the part your palm of your hand is touching. ???
I said gear housing, it's called bearing carrier.
@@noriccrome6251 it's the pressed in rubber hub. You will have to cut it off. Hope this helps. Son
@@MerCSonL6 Son??? Thanks! I tell my College age granddaughter that one.
That's his you tube name. He didn't call you son. Smh
Were the cracked caused by not lowering the engine and lower leg holding rain water that froze?
Any chance u can show how to re align the shift rod without pulling front gear out
Aligning has 2 definitions: Aligning the shift cam on the clutch dog or Aligning the shift shaft on the shift cam. Which one are you referring to?
@@MerCSonL6 well right around the 9 minute mark u start talking about forward nutrual and what not and the rod that shifts it into gear well mine is free spinning because I'm a idiot and took it out now I got no gears when I try shift
So I need to align my shift rod to what ever kicks the gear into forward nutrual and reverse
I have a 96 force 120 BTW not same motor u are working on but the lower ends look identical
@@michaellivingston4084 sounds like the carrier needs to be torqued more. The cam should not be able to do a 360. Turn in the crown nut more. It's best to have the shift cam as close to neutral as possible. Let me know. Son
Great video, I’m having trouble getting my crown nut off mine, any other tips that’ll help?
I heard mention some folks make the tool using 4" exhaust pipe and cutting the tabs needed using die grinder. I would keep hitting it with good penetrating oil.
I can't even get the trim tab of my 110hp. The hole to access it is only around 3/8" in diameter. Unbelievable
Mine is an Allen key but I’ve seen a lot of guys break a piece off the hole to fit their socket or extension in then jb weld it. Lol
Drill it out. Son
@@MerCSonL6 thanks little boy . I got it though
Do you have to check the lash?
Lash is determined by the shims. As long as you replace the shims you'll be good. I'm not good enough to do it by hand. Son
@@MerCSonL6 thank you for your response. I’m moving gears from a busted gearbox to another. I’m sure I’d have to shim it differently? Or use same shims but check lash?
@@jasonwthompson5003 same shims and definitely check lash. Son
@@MerCSonL6 thanks man!
I buy fishing boat it have 850 850 85hp i need rebuildthe carburator or buy
Rebuild it. Much cheaper. Son
I Know That This Is Probably A Stupid QUEE estion..and we love your little camera girl! but if my propeller is turning to go forward, the impeller is swishing against the inside chamber tabs back! Right? >and I suppose that that Is always a checkpoint..>gear oil..en what grade or what! Thank You! GOT! an 80hp4cyl(83)..50hp4cyl(68) we're working on! Like!
That is correct if I am understanding your question correctly. The gear lube I use is quicksilver.. which is manufactured directly Mercury's.
@@MerCSonL6 way cool..Love ya man..Peace! quicksilver!
Man i wish you guys could help me with my merc 115
It can happen. Son
@@MerCSonL6 one prob im in utah
What help do you need?
Rebuild tossed wrist pin bearing
Hey I hope you don't mind I am sending people on Facebook on merc page and outboard repair to watch I tell them wht I know but send them to this source source ytpage Miguel is my name hope ya don't mind me copying your page video links to issues I'm trying to help fellow boaters
Don't mind at all my friend. Son
You don't take pride in your work I notice
You could not be more wrong. Thanks for trolling. I appreciate ya! Son
Butcher