B&S seized 5.0 on push mower

Great that you got it to move, never seen a new motor locked up, maybe 1st owner tried to start it without putting oil in motor because motor does not come with oil in it from factory but will be in box.
 
It sounds as if the mower was purchased and started without oil, after it stopped the owner then added the oil he was supposed to have put in before starting it. If that is what happened the connecting rod seized to the crankshaft, the connecting rod overheated and deformed causing the bolts to loosen. If this is what happened the bolts will backout after a few hours and you may have an inspection hole in the crankcase.
I explain this because I have seen this happen. By the way it will also scuff the clyinder/piston.
I do hope I am wrong but be aware it may happen.
 
Safehorses said:
I picked up a Murray push mower with a B&S 5.0 motor. Mower looks like it's never been used. However the motor is seized. Can't pull the cord at all. I have no idea what to do. Any suggestions would be great.
Thank you
Brenda
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First I'd suggest you don't use the pull cord for all of these attempts at starting it. Simply reach under and try to move the blade by hand so you don't get the rope unnecessary tight or worse break the pull string or the assembly itself. That said, it might sound silly but have you tried to spin the blade by hand? If it doesn't move then pull the plug and try again. If still no then pull off the starter string assembly. Should be 3 or 4 screws right on top. That'll make sure it's not an issue with the pull cord assembly binding up.
So now this is where I say you would do best by looking at it for what it is, a possibly blown mower you got for cheap and do the following. Assuming it's still not moving I would say put a small amount of oil in the cap from a quart of SAE 30 and pour it in the spark plug hole. Put the plug back in finger tight and leave it alone for awhile. Then pull the plug back out and try to move the blade if still no go then you probably have your answer but if it were me and it was my mower I would take a small wooden dowel rod as big as you can fit into the spark plug hole without binding and simply apply pressure as you're simultaneously trying to move the blade by hand.
 
Mezman said:
First I'd suggest you don't use the pull cord for all of these attempts at starting it. Simply reach under and try to move the blade by hand so you don't get the rope unnecessary tight or worse break the pull string or the assembly itself. That said, it might sound silly but have you tried to spin the blade by hand? If it doesn't move then pull the plug and try again. If still no then pull off the starter string assembly. Should be 3 or 4 screws right on top. That'll make sure it's not an issue with the pull cord assembly binding up.
So now this is where I say you would do best by looking at it for what it is, a possibly blown mower you got for cheap and do the following. Assuming it's still not moving I would say put a small amount of oil in the cap from a quart of SAE 30 and pour it in the spark plug hole. Put the plug back in finger tight and leave it alone for awhile. Then pull the plug back out and try to move the blade if still no go then you probably have your answer but if it were me and it was my mower I would take a small wooden dowel rod as big as you can fit into the spark plug hole without binding and simply apply pressure as you're simultaneously trying to move the blade by hand.
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At this point what's the worse that can happen right?
 
Safehorses said:
The hammer and wood worked! It's free! I'm so excited. Thank you all so very much!
I'll have to run out and get fresh gas and see if it will try to start.
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The one thing not mentioned often enough is the TYPE of gas used. I've been using ONLY premium 91 or 92, ethanol free if you can get it in your state! Using this high octane fuel utilizes the additive package best, which is 10x more than in regular unleaded!
 
Brenda,
You have received advice from several people on the forum. I am not going to tell you how to start your engine ,BUT I do want to give you a very important warning. You are not a mechanic and you are probably a novice around mowers. DO NOT pick up the wheels off the ground until you have pulled the wire off the sparkplug. Double check yourself ! If not, turning that blade is like cranking an airplane. Should it start you have a meat slicer in front of you. BE SAFE. We don't want anyone hurt.
 
Hi from what I read not one person said to put a penetrating type oil in cylinder. setting it up so the spark plug hole is strate up with like marvel oil or gibbs penetrating oil And let sit over nite before trying the medfords others subjected all needed to free it up ! if it turns it should run But the damage has been done so it smoke till it burns off the oil that freed it & will use oil going forward ! so just keep an eye on oil level ! enjoy till it breaks
 
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