As an online unseize-engine video critic, I can say this definitely makes it into the top ten online engine unseizing videos I've seen in the last 20 years.

If you are restoring an antique outboard with a really stuck piston, you can fill the cylinder with old motor oil. Then, weld up, drill and tap a spark plug base to hold a grease nipple and pump grease into the cylinder to get the piston moving towards the exhaust port. The restoration guys do this and then they very carefully tap the rings with a plastic hammer all the way around and if you're lucky you can free the rings to run another day.

I primarily use youtube as an educational tool for learning about new things like outboards and building decks and such. This is the kind of video I wish more people would make. Great job on the engine AND the video!

some people I think should stay away from engines, I know I'd keep him away from mine.

I'd never use an impact wrench. Better to use a breaker bar and gently rock things. It would be easier on the rings and the cylinder walls.

I'm glad you got it freed up....Improper storage procedures will do this everytime…. Mix the oil a little heavy for awhile to help free things up gently...

Use diesel fuel to soak the cylinders with, let them soak a few days, then pound the flywheel carefully one way and then the other... it will break free

from an old ob mech. it it's still seized,remove the head and pit the shaved dow nend of a 2x3 aga the piston uppermost in the cylinder give it a medium whack with a small sledgehammer. this usually works if the engine 2 cycle was not run without oil

shake up a bottle of 1 part automatic transmission fluid and 1 part acetone. pour a little into cylinders through spark plug holes and let sit for a few days. I have two spark plug bases that are welded shut. One has a schrader valve soldered in it like the valve stem of a car tire. the other has a grease gun zerk fitting. To free lightly stuck pistons after soaking. Use the Schrader valve plug alternately and fill each cylinder with air to @130 psi. That will work with less stress on the fly wheel and connecting rods than an impact wrench. If the pistons are rusted in bad, the zerk fitting plug is used by pumping grease into the cylinder to hydraulically press out the piston. If using the zirk fitting, you need to unbolt the cylinder or unbolt the crankshaft bearings in order to not damage the connecting rods.

Marvel mystery oil or transmission fluid soaked in the cylinders over several days works well too.

good to see that bros frequent the same videos

using an impact on the flywheel nut is bad business. If the piston doesn't move u can do serious dmg to the threads on the crank. then ur in trouble. Best to use a long breaker bar and move it back and forth in both directions until it frees up. happy wrenching and good luck

Transmission Fluid works fantastic for this as well. FYI

PB blast and an impact gun works too. Can find PB blast just about anywhere these days

Dangar Marine - his vids are comprehensive. Trans fluid and a short breaker bar. Start it - just a thought.

Sure, it's unfrozen (although you didn't show that it was frozen in the first place, you just said it was), but it didn't start. No reason to assume it works. RichE

Ok this is my method, go to any auto parts store and buy wd-40 fast acting penetration oil (not regular), lift up motor til the propeller is facing the sky. Doing this makes the cylinder in a vertical position, next remove all sparkplugs and fill each sparkplug hole for 45 seconds each. Gravity will work its magic and free the locked up piston causing there to be no crank, leave it soaking depending on how long its been in this condition in my case it was only a month so it got freed up with one hour, so u know how bad mine was locked up I broke two ratchets and it wouldnt budge before buying a straight bar

ATF and Acetone. Much cheaper and use a breaker bar back and forth slowly. Once it starts to move let it set for a day.

hey mike, i just by chance watched this video in the preparation for the 3 bungled mercs im gonna get with that boat.

I was given a seized up mercury 9.8 110 outboard that was laying around for a couple of years I got some wd40 sprayed in cylinder and carb started tapping on prop and pulling on the robe in about 15minutes it loosened up and now it turns

good sales person in training....

Great information thanks ☺

I found a 1969 Merc 200, 20 hp on the boulevard but the only thing that's wrong is that the drive shaft wont turn the propeller when i took the lower unit off, since this an old motor i don't know if that's what it supposed to do any suggests?

Try to break it loose with a breaker bar easily back and forth, not a impact gun you could snap the rings.

Lol that motor was not stuck

So you broke it free. So now you just run it with the rust in the cylinder? That'll do your rings a world of good. Yeah, Buddy ! ! !

do they still make this stuff?

your are correct ( Gogle ).., but its not his engine so I guess , it does not ( matter )...!!!!

I like Marvel Mystery Oil, just did a 4hp Johnson.

Word of the wise, Don't let engines sit dry for more than 6 months. Put marvel mystery oil in each cylinder, bag intake and exhaust. Roll over every couple of years and repeat oiling. You will NEVER have this issue.

hey man wow where in the hell you get stuff to unseized that evinrude if my evinrude comes across to seizing up maybe you can tell me how to get that stuff so I can unseize my evinrude mine is a evinrude 15 hp i'm going to get another one hear in a few week and just incase my evinrrude 15 hp seizes up on me I can use the other one until my 15 hp evinrude gets unseized so i'll have a back up evinrude that same design like I said how can I get my evinrude unseized what do I use to get it unseize d tell me a little about hey man thank

.....or just push the engine release button.

Just use any lubricant diesel, motor oil, Trany fluid, I don't believe the impact is a good idea though it may break a ring on the piston. I use a cheater bar and feel it buy hand. That's the best method. And you might want to take the head off to inspect the cylinder, because there might be a rust ring left from the rings and cylinder wall. Then a good deglazing stone should be used. There's no quick fix for a seized engine. Js

seems like a load of crap

I was worried he hydraulic locked but luckily he went horizontal on the cylinders, me personally, I would of rotated the flywheel twenty times before putting the plugs back in, dude

1:34 lmao tounge noise*

It didn't even start

Not seeing where that engine is mounted and looks like it is simply sitting on the cart and balanced on a thin piece of wood. If there was an ounce of tension in that flywheel that engine would have moved. I call BS and can't imagine he had a locked engine in the demo.

You cant just not show it running.

Didnt even Start

Didn't even run

Infomercial. Corny. Sales pitch.