way to unseize a seized engine? please help!

I jsut got my new engine put into my cb750.. and it may be seized, when i turn the jkey and try to turn it over, i can tell the starter is trying to move... what do i do to unseize it? can you put a tsp of oil in each cylinder and wait over night? isnt that what alot of people do? I have some 20w-40 oil that im ready to pour in. maybe ill try and crank the engine by hand, if i can produce more strength than it

 

i'd try by hand first, pull the plugs to make it easier to spin(no compresion) other than that i'm not sure what it would do to the clutches, ect. but i've seen people use PB blaster before. but i'm not sure what it could damage.

 

go get a pint of Lucas De-seiz-it, put a quart down each plug hole then put the rest in the crankcase, change your turn signal fluid to strawberry then push the bike backwards 50 feet with it in reverse
then press the Pkey
nothin to it

 

What happened to Mouse Milk or Kroil ??

And what happened to your old 750 motor, that I asked you to compression test months ago??

You painted a bike that did not run? Am I being too hard on Ol' Schoot?? the XJ Wizard?

 

damnit polock, you actually had me going, thinking there was an easy way to it..
and yes time to ride, im a moron... never did a compression test cuz i dont have a guage... uuugghh, i drove my truck around for an hour really pissed off, jsut ring to blow some steam ,the i walked around walmart for a half hour, came home, and put some oil in the cylinders... i think ill try and put the bike in 5th gear and turn the rear wheel.

 

Polock left out the part about putting seafoam in the muffler bearings over night.

 

Schooter I have never tried it with a motorcycle but have used liquidwrench in the cylinders on a couple of old truck with good results.

 

I've heard or brake fluid used before. If I was going to try something, I would give ATF the first shot though.

 

atf? is that a kind of brake fluid, lol damn.
anyways, im writing this rite before i go to bed, i tossed some oil in the cylinders again, tried cranking it, and it moved a bit!!! though its stuck again.. so im gonna let it sit over night and when my dad wakes my up at 7 am, im gonna rush out into the garage and try it again.
i have a nice medly of 20w-40, some mystery oil in a squirter, and john deere multi purpose spray lube... that stuff is useless...

 

well after searching around.. brake fluid or marvel mystery oil helps....
anyone wanna spray some kroil in a little container and mail it to me? i dont have a credit card to do the google offer.. that stuff may work

 

You shouldn't have bought the engine without performing a Compression Test.

Put the Engine on cardboard, fabric or set it in a small tire.
Pull the Plugs.
Use a Tool to get the Cylinder Readings.
Run the Starter with Jumper Cables and a Car Battery.

Look at the Readings.
If the Engine don't spin or the Readings are below specs ...
Say "Thanks but No Thanks" and leave.

 

My dad ran his two cyl tiller when had no oil and seized it up. I pulled the heads and applied liquid wrench over night. The next day I took a 2X2 and gently tapped the pistons one after the other. After about 4 raps on each it freed up and has been running for 2 years since. It all depends on how bad the damage inside is though. This was a brand new motor.

 

Shooter,
How much are seized motors going for these days :-O>

 

approx. $248

i may call the guy.. if he's honest... he may have f'up when he looked inside the engine and stuff, and maybe he'll refund the money, if not, I think I'm gonna go to emc cycle in yale and buy one...
I have about 4 different things sitting in the cylinders right now.. hoping it will work.. and what i though was the engine turning over before, may have been the starter making soem kinda noise..

 

before you do anything drastic, are you sure the clutch is disengaging ?

 

well, the wheel spins in neutral if thats what you mean... i'm gonna pull off a cover and try and crank it by hand..

 

i'am sure it will but will it turn with the clutch in while in gear, that means the tranny isn't jacked and the clutch does something

 

alrite heres tyhe scenario, took off the magneto/ stator cover, and i can go backand forth about 1/2 crank, what does that mean?

 

"1/2 crank" as in 180 degrees, well either the pistons arn't stuck or you have the worst bearings in the world
maybe something is jamming the primary chain

 

I cant say this is what your issue is:

my motor would only rotate 350 degrees when i becan my project - someone had dropped a screw into cylinder 1 and 4. More or larger foreign items int he cylinder could limit movement to 180 degrees.

One tool I still want is fiber optic scope to look inside stuff like that.

 

Hard to diagnose without the bike in front of me,but I encountered a similar dilemma. I bought a CB550t with a locked up motor. I sprayed some penetrating oil (the name escapes me,but I can do a deep inner cranial search,if you are interested) in each cylinder,and toted the bike around on the back of my truck for about 2 weeks. The constant agitation of road irregularites (and the fact that my truck REALLY needs new shocks) did the trick. 120lbs in one cylinder,125 in the other. But now I have to find something else to use as a boat anchor.

 

What have you bought there, Schoot', is it a compleat bike, a rolling frame, or just the mill?

 

The oil in the cylinders should help and try to "bump" start the bike. Try her in 3rd gear and get someone to give you a good push. That may break her free.
I rebuilt an old 871 GM "screaming jimmy" that was seized up, turned out that the PO had installed one set of connecting rod bearing sleves in backwards and the the friction on that one journal was enough to prevent the engine from turning over. May be something simple like that??????

 

Don't try to bump start it if it's stuck. My bet is on a valve being stuck open (probably exhaust) and it's hitting the piston.

Take the rocker cover off and see if there is an overly loose tappet. That will be the one.

Come back if you find this and I'll run you through how to free it.

 

Thats what I'd do. Visually inspect EVERYTHING first man.

 

I second that. You need to inspect and find the problem. Don't force it you'll make more work for yourself if you do.

 

This motor is currently in the frame, I guess, so it would be a bit hard to invert it upsidown and gently try to turn it over by hand, maybe some object got jammed in whatever chains are in an old CB.

If you then can turn the engine over, you have to go in and find the "object". Maybe laying the bike completely over would have the same effect.

How about buying a running bike?

 

I have used Automatic Transmission fluid in a couple of old inline v-6 truck engines. Put a couple of ounces in the spark plug hole let it sit overnight. It would smoke like hell for 15 minutes or so after it was cranked but it worked everytime.

 

QFT

ATF is the way to go.

 

but my engine isnt seized i htink, theres just fomr foreign or lose thing bloacking something from moving

 

OK Schooter... it's time to prove to us that all the sage advice and wisdom bestowed upon you has not been in vain...some of it has GOT to be sinking in 8O
These guys have given some good advice... when something is wrong with a motor you have to be methodical in your approach. It seems to take longer, but in the end you find the problem and you only have to fix what's broken, and only do it once. You can either be a shadetree mechanic who diagnoses the problem and fixes it.....or a parts replacer who throw a bunch of new parts on hoping one of the new parts solves the problem...after all...even a blind squirrel finds a nut every now and then....

 

Which is more than likely a stuck valve. Either take the rocker cover off and see if there is a loose tappet, or pull the spark plugs and shine a torch in each cylinder while you try and turn the motor. If there is a stuck valve touching a piston it will be pretty obvious.

 

It's been over a month. Whats the verdict?

 

Changed the Flux Capacitor, works fine now... ( No clue honestly, Hope it's running )