Fixing a four stroke outboard that is leaking oil

[@CessnaPilot99]

It's good to see you going back to your KZbin roots and doing some outboard repair/maintenance videos

[@wildwestcoast8095]

Yup that’s what I was thinking the entire video lol

[@DangarMarine]

Thanks mate. Planning to do a lot more outboard videos now Renko is up and running.

[@facilis]

My thoughts exactly!

[@lucasthomas6912]

@@DangarMarine oh thank god ive been having withdraws haha

[@gavinferguson]

@@DangarMarine loving the wild man look

[@facilis]

So good to see outboard repairs coming back, and good variety of brands too! There's so much good stuff for all of us running outboards.

[@DangarMarine]

Thanks mate, hope you find them helpful.

[@arciefan]

You're an excellent mechanic Stu, and I must say I have never seen Adrian stumped on anything, almost like he understands everything that is made, pretty amazing to me!

[@DangarMarine]

Thanks mate. I really enjoying working with Adrian, there is almost no problem he hasn't seen before so I always learn something!

[@michaelhill7471]

If you ain’t stumped on Detroit’s you ain’t stumped on anything. LOL Love watching these guys work.

[@ionracer24]

All internal combustion engines operate on the same basic principles. u can apply it to almost anything your working on. The worst part are the computers that run everything.

[@bassneckfishing2505]

I just want to thank you for all the Knowledge you share if it wasn’t for you my boat project would have never got done she is on the Water it took me 2 years

[@DangarMarine]

You're welcome mate, great to hear your boat is in the water!

[@dominaror5344]

The outboard repair videos are very useful, I'm looking forward to the Yamaha two-stroke as well.

[@DangarMarine]

Thanks mate, coming soon!

[@chrisbarker6797]

Gotta say I enjoyed watching you working on an outboard again. And having Adrian in a video is always gunna be a winner 😂👍🏼

[@DangarMarine]

Thanks Chris, glad you enjoyed it.

[@danielrobert7181]

I'd sure could benefit from having an uncle Adrian to bail me out of mechanical trouble. Kudos to the gentleman !

[@AdventureCD]

Back to your roots! Love the outboard and mixed content style.

[@facilis]

💪

[@DangarMarine]

Much appreciated!

[@Marine-Maintenance-Fife]

Great to see the outboard maintenance coming back!! Love it keep it up Stu.

[@DangarMarine]

Thanks, more to come!

[@mufuliramark]

Another lesson to learn about catastrophic oil leaks that I will never need. Why does my life go on hold when Stu uploads another epic..

[@dennisreeves632]

Great video Stu. Love watching you guys work, and the chickens too.

[@DangarMarine]

Thanks 👍 Glad you enjoyed it!

[@glenohara6563]

I think you find the main and con rod bearings are prevented from spinning by their crush fit in the rod/cap or main cap/block, the tangs are there for alignment. That's as I was taught many years ago. Love the content with Adrian, he is a true ledged on the tools!

[@DangarMarine]

Yes, they sit slightly proud of the casing which expands them and locks them in. Just one of those modern cost savings designs that us old timers can't fathom. ;)

[@stevenholton438]

Was Adrian stumped then?

[@georgehughes8698]

Great job explaining exactly why you were doing each step. Loving the video's you are getting better with them all the time.

[@DangarMarine]

Thanks George, glad you enjoyed the vid.

[@stco2426]

Good work and a pretty involved repair. Amazing just how complex a modern 4 stroke OB engine is with lots of electrical circuits on top of quite fragile castings. I replaced a lower oil seal on a 60hp M but thankfully it didn’t have the corrosion or the lipped-seal. On those there’s a very pricey crush washer underneath the flywheel. I couldn’t believe how expensive that was and the timing belt was astronomical, too. Looking forward to seeing more from the yard and the workshop. Thanks!

[@tyhaggard3536]

You're videos are always informative and entertaining

[@DangarMarine]

Thanks Ty.

[@scottbeattie6645]

I really love how all the people of the Hawkesbury work together and look out for each other. I hope they do well with the tour business till the oysters come good again. Always fun to see Adrian and yourself playing with big toys.

[@DangarMarine]

I hope so too!

[@wolfpackflt670]

I've had a bit of anxiety about how "nice" my boat looks but after seeing the array of boats on this channel it eases me up a bit. My boat doesn't look that bad...

[@motorv8N]

Fantastic repair there. Makes me appreciate fresh-water boating seeing what that salt can do.

[@iantyler4045]

I really enjoy watching your outboard repairs. My first boat had an old blue band mercury 70hp outboard on it. It had a lot of problems and I thought I was up to the task of sorting them out. After lots of time and money spent I realized I was throwing good money after bad. After watching you work on outboards I now realize how little I knew. Looking forward to your next video.

[@DangarMarine]

Thanks Ian, glad you are enjoying the videos. I can understand that feeling, when you start out you just don't know what you don't know.

[@makeitwork583]

I love this type of content! Be well.

[@DangarMarine]

Thanks Paul, glad you enjoyed it. :)

[@bishopkinlyside8477]

Hi guys once again just love you that banter that you and Adrian have together even though you’re working your bum off you still have heaps of fun together just fantastic and the knowledge that you guys pass on to others you cannot buy this , Adrian is very knowledgeable on most Motor, Thank you once again for your videos really enjoyed them Cliff from Logan City Queensland Australia, Sorry Queensland had to kick your butt in the State of Origin first I’d like next year not

[@DangarMarine]

Thanks mate, glad you have been enjoying the vids. You're fogiven for the rubgy. ;)

[@richardmurray6651]

Interesting repair Stu. A lot of work to strip down to replace that oil seal.

[@DangarMarine]

Thanks mate. It is certainly a tricky seal to replace due its design.

[@samwhitehead7695]

As always i enjoyed learning more about 4-stroke engine internals, Thanks to both of you, Regards from FNQ.

[@DangarMarine]

You're welcome, glad you enjoyed it. :)

[@elliotthaddrell3917]

Great to see you again Stu 🙂

[@DangarMarine]

Thanks mate!

[@TimsWorkshopTJY]

Awesome video Stu, So nice to see you in the shop again. That's a beast of a motor but looks pretty straight forward though.

[@DangarMarine]

Thanks Tim!

[@damodoesall6240]

Old school Dangar Stu !!

[@DangarMarine]

I am enjoying the outboards again. :)

[@dougcanning4524]

Great video Stu, well done with the resurrection, out boards are really made from not much for good reason ... an old friend used to use a belt sander too clean up cyclender heads on 25 year old units that should have been scrap

[@DangarMarine]

Thanks mate. Plenty of these outboards do get scrapped when they still have some life left in them.

[@Jacobtheunwise]

Love to see you've released a video on a rainy day like today

[@DangarMarine]

Hope you enjoyed it!

[@bobbebbington5356]

Another excellent job from the A team.cant wait to see the barge in the water. Glad you survived the flood,a shame about the oysters.

[@DangarMarine]

I'll see if I can film one of their tours.

[@bobbebbington5356]

@@DangarMarine Are you running a competition or is it a scam

[@JosephSmith-sg9yv]

This is why I loved 2 Strokes

[@HVASEA]

Back to bench work... Love it!

[@DangarMarine]

Thanks mate. :)

[@dket2571]

Really well presented. A lot better than most others I have watched. Looking forward to further episodes. D

[@DangarMarine]

Thanks mate, glad you enjoyed it!

[@tomhurley3938]

Good Job Stu! Thank you for bringin' us along and teaching us some great repair moves. BTW, your new "look" may qualify you as a professor at UC Berkley. When you get over here to California, walk onto the campus and see. BTW, do you still have real gasoline to run in outboards down there? Here on the left coast our automobile fuel doesn't have much petroleum product in it..... Wont even clean varnish from a paint brush...Wont run in an outboard either.

[@DangarMarine]

Thanks Tom. Last time I was at Berkley was to watch a Greatful Dead concert. Petrol here is still pretty standard when it comes to boats. Only car bowsers well fuel with ethanol in it.

[@Colt3854]

Stu, i always take a heap of happy snaps and video prior to a pull down of motors. Has come in very handy at times when the memory fails with what goes where. My memory is bad so these little aids work for me. I have used JB Weld for problems like what you tig welded. It has never failed, great product.

[@DangarMarine]

For sure. I took plenty of photos of this outboard as well as taking the video. I have used JB Weld to fix a hole like this before but it did eventually fail in my case. I'm hoping this lasts quite a while.

[@74nova36]

@@DangarMarine could you explain why the hole was even there? I’m not sure why you would the ports connected in such a fashion. Is it literally letting oil into a water jacket or vice versa? Sorry if it seems a dumb question

[@altacat9702]

...fancy engine breakdown and reassemble!! ...thank you and fun to see the guts of something that new : )

[@DangarMarine]

Our pleasure!

[@sanitymaintenance1585]

I have run into that before with small micro bubbles coming out of the weld . Pressure and heat building inside as you are welding .You are putting pressure on it to check the weld but you can put a vacuum on it as you are welding it and it will seal up . (a very small vacuum.. the liter the better)

[@DangarMarine]

Interesting idea. We were also talking about peening it with a punch to help close up any small holes.

[@sanitymaintenance1585]

@@DangarMarineI think that would work if you were brazing it after . Heating the aluminum by brazing and seal it off . Brazing has always been a little easier for me than welding. Just remember micro bubbles are from trapped heat or from the weld of brazing .

[@jamesa4124]

Thanks again Stu. Always glad to see your new vids. Stay well Mate.

[@DangarMarine]

Thanks James!

[@kankama1]

Thanks for that Stu. I always learn a lot.

[@DangarMarine]

No worries, glad you enjoyed it. :)

[@timvalentine7196]

Love your vids Stu been watching for years keep them coming mate!

[@DangarMarine]

Thanks Tim!

[@andrewking4885]

Great you tube channel where you can learn an awful lot about different subject matters. Love the jazzy music in the intro, the Benji dog. Has Adrian done a ''setting the rack on a Detroit motor''

[@marcobrian1619]

Fantastic, work on that outboard, was really interesting....... Like all industries different engines in different environments have different problems. IV used "speed sleeves" before on Perkins engines, but again was different, just warmed the sleeve up....tapped it home with no trimming and was good to go. But these engines you had about 3/4 goes at just moving the seal in or out a couple of mm to get afresh face to run on. Really like how you all work out faults the work out the fix.

[@DangarMarine]

Thank you very much, glad you enjoyed it. :)

[@nmccw3245]

Good work with TIG Stew. Tough weld all the way around. 👍🏻

[@DangarMarine]

Thanks mate, it was a tricky one to get 100%

[@darrylmcleman6456]

I guess if you are in the land down under you may want to run an upside down boat!!! CHEERS from Canadian Westcoast!

[@74nova36]

18:25 I agree with you and Adrian, what a mess of a design for bearings, no little cleft edge to hold it in place or anything? Sometimes I really *question* Yamaha’s engineering. Wish I was there, take care mate.

[@DangarMarine]

I think it is one of those modern less is cheaper things. Because the bearings slightly protrude higher than the housing they are held in place by their outward crush. It just feels weird not having anything to hold them in position while you bolt the casing up.

[@74nova36]

@@DangarMarine I believe they expect the average man to never see them these days as well, or to simply even…replace the power head?? 😮‍💨 You nor I would do such a thing unless absolutely necessary. Must’ve been a trip bolting the crankcase back together and assuming the best would happen. Stay safe, your content is still 10\10

[@michaelmcclure8673]

Stu you could've used a gas lense cup with a longer stick out if needed. Who ever owns that engine is lucky, up here most shops would've refused to repair it

[@DangarMarine]

I did push it to the limit but wasn't getting enough gas shielding in the end. It's tricky because the small cup makes the gas come out too fast and blow the puddle away unless you turn down the pressure in which case you get a black brown mess. It was definitely a tricky spot to weld!

[@ionracer24]

@@DangarMarine Aluminum tig is my nemesis. i have the worst time with it...

[@michaelmcclure8673]

@@DangarMarine All the cast aluminum I've messed with welded like chit. It has all garbage in it. But with the large gas lense it gets the argon where it's needed.

[@davidwindel8715]

Add a quarter inch flat bar 1 inch to 10 feet for the length of the boat and a resting depth of .25 with the full stern with motors. Don't forget to gusset it. About 2% down max on the turn down on the plate. Old Texas trick !

[@DangarMarine]

Good tip!

[@timjohnun4297]

ah, the good old salt water soluble 4 stroke Yamaha disprin motor. The temptation for JB weld and unload must have been strong ;)

[@DangarMarine]

The words "JB Weld" were said several times during that day. ;)

[@timjohnun4297]

@@DangarMarine after spending nearly a grand on the head of mine, repairing corrosion, overhauling valves, etc, only to find it had a hole in the block, that’s exactly what I did 🤣

[@BaadMotorFinger]

Uncle Adrian is the most Australian guy I've ever seen

[@DangarMarine]

LOL

[@bstiger6482]

Please show us more videos about your trawler and the barge you were going to build. Also, you repaired the boat to do salvage work, so when will that happen? I miss those videos.

[@rootsblowersanddetroits7419]

There coming cost u day of needle gun lol

[@alexjinks6172]

LOL ..... Hairy Maclary and Uncle Zachary Quack.. Kind regards Alex

[@DangarMarine]

That's pretty much us!

[@gordonagent7037]

Great content Stu

[@DangarMarine]

Thanks Gordon.

[@theteadrinker-143]

Good job Stu 👍🏻

[@DangarMarine]

Thanks Mike!

[@steveselvage40]

Brilliant video!

[@DangarMarine]

Many thanks!

[@soggybottom3463]

Great stuff. Anything with Adrian is good for an auto thumbs up..😅😅😅

[@DangarMarine]

I'll have to get an Adrian mask then. ;)

[@soggybottom3463]

@@DangarMarine 🤣🤣

[@shadetreewelding]

Also fork lift are good for testing the tensile strength for wiring harnesses as well... don't ask.

[@shadetreemechanicracing22]

Both you and Damion are getting shaggy.

[@DangarMarine]

It's a winter thing.

[@lpd1snipe]

You got yourself a good mate there in Adrian. Hopefully when you make it to the states again if you make it to Florida, I'd love to buy you a beer, but I'm not buying you a Foster's..... that stuff is crap!

[@DangarMarine]

Thanks mate. I'd love to get to Florida to do some diving, we didn't get down SE on our last trip. I agree, Fosters is terrible. No body drinks it in Australia at all (seriously)

[@dmplum]

Thanks for putting out these videos, it’s good to live vicariously through them. I didn’t really understand what happened to the oil return pipe that you had to weld it up and wouldn’t that affect the cooling?

[@DangarMarine]

The weld was just built up over the hole, it still has oil flowing through it beside the cooling water.

[@Tristanbirdyt]

Absolutely fantastic video hope you’re doing well thank you so much really interesting. Thank you so much

[@DangarMarine]

Glad you enjoyed it. Thank you!

[@tommyhanlon8012]

I luv these vids, thanks Lads.

[@DangarMarine]

You're welcome!

[@mikedougherty9165]

thanks, great as usual

[@DangarMarine]

Glad you enjoyed it

[@brooster87]

Hello there. I so enjoy your videos. I have a 1985 mercury blackmax 150hp that someone gave me. I tried it out and it idled fine at first but after going just a little way on the lake it would rev really high in neutral. Can you help with ideas to look for? Thank you so much.

[@fredflintstone8048]

I had an umbrella cockatoo, a female who seemed to enjoy pushing scraps of bread I would give her from time to time in her aviary out through the wire for the wild sparrows to come and feed on. they would flock on the other side of the wire gobbling up the bread why she seemingly joyfully kept pushing it through the wire mesh.

[@DangarMarine]

I think she was lonely and wanted to make friends!

[@fredflintstone8048]

@@DangarMarine Could be although she lived with another umbrella in the same pen, her brother actually. They were both hand raised babies from the same parents. It was funny. You could see she got very excited by the flock of sparrows.

[@cntsailing4552]

Loving the work Stu, You know anyone who wants a stranded 50ish ft wooden workboat? sitting in Adelaide at the moment.

[@DangarMarine]

I would love one but it's a fair way away. Any more details? Email me at [e-mail]

[@fairhall001]

Love the parrots, sitting here feeding the locals at my place as I watched your vid. 3 types of Cockatoos that are fighting each other for the seed.

[@DangarMarine]

Thanks Ben. It's funny watching how much they fight amongst themselves even though there is enough for everyone. :)

[@ionracer24]

U need more chickens stu! Hope ur givin ol adrian a piece of the utube revenue pie for all his hard work and comedic contributions😁Ya'll make a great team! Cant wait to see more! Too bad about the oysters. Feel sorry for those fellows. Its the opposite for us in tx. No rain for months here. Everythings drying up and blowin away.

[@DangarMarine]

We support each other's projects as best we can. Hope you get some rain soon!

[@ionracer24]

@@DangarMarine i figured..no rain in forecast for coupla months unless we get some sort of tropical low maybe. We'll see i reckon!

[@renem6441]

When is Sleeze coming back to the channel?? Great work on the outboard !

[@rootsblowersanddetroits7419]

We actually discussed it other day !!

[@jayrico95]

Any videos of how to do a regular oil change on a Yamaha 8hp? Thanks

[@danleicester6875]

Hey Stu As always love your channel and your cameos on others thus what’s the update with the LTD?????

[@DangarMarine]

LTD is registered now but I haven't even seen it since that day. Really need to find time to get back down to Mike's and do some more work on it one day.

[@terrydown5389]

Great job thank for sharing

[@DangarMarine]

You're welcome.

[@williammcdonnell3748]

does adrien have a youtube channel ,love your vids stu so informative & extremely interesting ,

[@DangarMarine]

Not yet, but maybe soon.

[@ruaraidhmcdonald-walker9524]

Nice fix!! What would’ve caused that? Just old anodes?

[@DangarMarine]

I think possibly a bad casting. This outboard has been serviced pretty regularly and all the anodes looked good.

[@ruaraidhmcdonald-walker9524]

@@DangarMarine Spot on welding too! 👍

[@kristoffscuba5466]

If I had Adrian in my garage with me I wouldn’t need a KZbin premium account. “How does this bit come off? I’ll just Adrian it and find out”.

[@DangarMarine]

Better than a KZbin search!

[@jp-um2fr]

I often wonder what DH thought of mixing aluminium and salt water. Any alternative would be I guess too expensive but some sort of coating perhaps. Either that or flushing every time you use it. I'll stick to my Rolls Royce CV12 (if I had one). Beauty is in the eye of the beholder.

[@handycrowd]

Me too. I flush my Yamaha after every trip. The thought of leaving salt water sitting in the engine in between trips makes me shudder. With the flushing port on the engine, it takes 30 seconds, or a minute if I'm not in a rush. I'm reassured by the 10 foot 'pee' and the sound of freshwater flooding out the bottom 🙂 But I'm the only one I see doing this in my marina, and I can tell that some of the other folks think it's overkill...

[@samgreer8596]

Nice. I can't wait to see it run! Also, what ever happened to the crank you were working on in several videos?

[@DangarMarine]

I needed the bigger press to put that back together so it is now up in Adrian's workshop, we'll finish it off soon!

[@ApprenticeGM]

Regarding grinding the corroded aluminium before welding - is it not worth covering the rest of the engine to avoid those filings entering cavities and orifices? Or does a good blow job afterwards and an oil change equal less work?

[@DangarMarine]

It certainly wouldn't hurt to mask it up, I agree. I think I'll tend to flush with a solution more than compressed air to make sure nothing gets driven deeper in.

[@steveshoemaker6347]

Thanks Stu.....Shoe🇺🇸

[@DangarMarine]

Welcome Steve!

[@christopherkise]

Have i missed something… whos workshop is this? Are you guys running a shop together now? :) love the video

[@DangarMarine]

The workshop is Adrian's new one.

[@christopherkise]

@@DangarMarine aha :) i am sure i heard about that , might just have forgotten. It looks very nice. Loved the tig welding of alu. Nice work.

[@MrEsco206]

Do you know what would cause oil or sheen coming from the propeller? I have a df140 03. Oil in the lower unit looks normal. My oil seems to have dropped a lil on the dip stick for the power head.

[@yannkitson116]

Wouldn't it be faster to braze/hard soldering the pinhole or is the temperature so high in that spot that it wouldn't last?

[@DangarMarine]

It's tough with aluminium. I think maybe with steel but TIG is probably best in this situation.

[@alan-sk7ky]

26:07 good man, VB

[@DangarMarine]

:)

[@alan-sk7ky]

@@DangarMarine sometimes, it makes it's way to the Uk ;-)

[@Combat.Wombat.official]

If Adrian's boat runs upside down, does he get wet feet when it planes underwater?

[@DangarMarine]

Very!

[@mattdog01]

Who took over Stu's Channel. This guy has a long beard and things on his feet. Who is this Stu-poster? Thanks for the video... whoever you are.

[@DangarMarine]

I'll find out who it is and take action at once!

[@hdrunk5]

Engineers: “Let’s make them split the case to install a simple crank seal….lol”

[@davidboscaljon3787]

great job on your video's. we have 90hp evinrude. the power trim works when the boat is going slow. It will not work 1/2 or full throttle. If we slow down it works, as soon as we start giving it throttle it goes back down. any thoughts?

[@DangarMarine]

Could be the bypass valve is partially open allowing the thrust of the prop to push it back down. It could also be failing seals.

[@rousy699]

Hi stu I am about to purchase a 2002 model Yamaha 4 stroke carby fed. Has 1400hrs and was wondering some tips for ongoing maintenance and future proofing it somewhat.. thanks mate

[@markbarker9213]

Do you think you should have installed the main bearing caps first ?

[@SteveMack]

👍👍

[@kdenyer1]

Running upside down is normal in Australia 🤪

[@DangarMarine]

Indeed it is!

[@kiiiisu]

brilliant video, was too short tho! :D

[@DangarMarine]

Thanks mate.

[@codylapoint]

I'm not sure why they stopped putting the little tangs on bearings, but it's not just Yamaha. I was overhauling a 20 year old 4.7 liter Chrysler V8 last winter and the original bearings had the tangs, but the new updated part numbers did not. I was told by a automotive machinest that (somehow) they are less likely to spin without the tangs on there. The only reason I can think of is that during the manufacturing process when they punch the bearings to create the tangs it potentially causes the bearing surface to become slightly distorted which would in theory wear them out faster. I guess if you run it without oil the bearings are going to stick and spin either way.

[@jgfyujiyyrfbhkjtrrvhujmbvfref]

You can use aluminum arc rods to weld corroded aluminum

[@DangarMarine]

I should try using some one day. I have never heard great things but it would be good to get some first hand experience with them.

[@jgfyujiyyrfbhkjtrrvhujmbvfref]

@@DangarMarine I tried Tig but 2 dam dirty in cylinder head arc rods hard to control so you have to do a lot of die grinding and planing very porous but managed to build up,very time consuming though

[@jgfyujiyyrfbhkjtrrvhujmbvfref]

@@DangarMarine used on 25d Yami still going strong,filled broken stud holes and tapped too

[@donwensil5027]

Awesome thanks

[@DangarMarine]

You're welcome. :)

[@_noname617]

Doulies.. v smart!

[@edwardcandlish3641]

Great informative video as always mate, wondering if i could get your thoughts on something? I recently purchased a stacer seahawk with a 2005 two stroke yamaha outboard, aint had it in the water yet but have run it on the muffs at home, it runs very well and i have just replaced impeller and thermostat, but i have noticed after i have ran it i am getting an oily black substance running down the skeg, i have had the prop off to check seals but it all looks as it should, i have noticed that the oil tank has been filled above the full line, do you think this could be the problem? Thanks in advance for any advice 👍

[@DangarMarine]

There are plenty of things it could be that aren't too serious. If it's coming out the propeller hub and running down it will be a combination of exhaust soot (making it black) and some unburnt fuel oil. It could be the prop seal too, a quick pressure test will tell you if there is a problem there.

[@edwardcandlish3641]

@@DangarMarine thanks very much for your reply, very much appreciate it and keep the great vids coming 👍

[@fixinanddoinstuff2134]

My yamaha 2 stroke 20sg also soots up. I tend to add a touch more 2 stroke oil than called for and I troll more than WOT

[@adamheazlett1179]

Look like old mate was growing pacific oysters.Heard people doing pearls down there thought it was still in Brisbane Waters

[@rootsblowersanddetroits7419]

Pearl farmers have shop down on river and do tours but no farming it up in Brisbane waters

[@adamheazlett1179]

@@rootsblowersanddetroits7419 15 Years ago undisclosed pearl farming in Brisbane Waters

[@herrakekkonen]

Did this corrosion leak something to do with internal anodes not changed regurarly?

[@DangarMarine]

Internal anodes were in great condition. It's weird.

[@bobjoncas2814]

good job...

[@DangarMarine]

Thank you! Cheers!

[@yuhaz]

thx

[@DangarMarine]

Welcome!

[@bobkam1761]

Since the powerhead came off the midsection, wouldn't you need to take the midsection apart to change the oil pan gasket. Along with exhaust manifold gaskets and so on.

[@DangarMarine]

There is a single gasket that goes under the powerhead to seal all those sections that we ordered at the same time.