Nothing to lose by taking a look inside the engine. Hubba has to remove the engine in any case, so taking a few more bolts out is not adding much work. I would do it with grandson’s participation so he can see what oil starvation does to an engine and so he can see how an engine works. Could be a nice project for the boys.
Craftsman lawnmower B&S engine replacement.
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MyGrassHasCrabs
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I replaced a worn-out B&S engine on a MTD edger with a Predator from Harbor Freight. Been working great for a few years now, although it takes a few pulls to start.
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That is a push mower... Is this really worth the time or are you looking for a project with your grandson? Check your local repair shop and see if you can get a motor off a discard /abandoned unit.
Vic bellan
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Don't give up on engine yet, put some oil in and in cylinders , and use breaker bar and socket to loosen up & turn, sometimes they can be saved ( I just did one )
Sorry - can't help with engine replacement. But your grandson's mishap reminds me of a similar issue I had.
A friend from work (single mom, new home owner) called to say she got a new Craftsman snow blower and asked if I could show her how it works and get it started.
It was assembled and delivered by Sears to her home. This was quite a few years ago - the first AC starter I had seen. So I looked it over and out of habit, pulled the dip stick. That machine was delivered without an ounce of oil in the engine. I was so glad the owner called me - if she had read the manual, plugged the machine into AC and tried to start it - instant seize.
Like a firearm, always check to see if it's loaded. An engine, always check the oil. I know most on this board would have check the oil in that snow blower. But it's just a reminder.
A friend from work (single mom, new home owner) called to say she got a new Craftsman snow blower and asked if I could show her how it works and get it started.
It was assembled and delivered by Sears to her home. This was quite a few years ago - the first AC starter I had seen. So I looked it over and out of habit, pulled the dip stick. That machine was delivered without an ounce of oil in the engine. I was so glad the owner called me - if she had read the manual, plugged the machine into AC and tried to start it - instant seize.
Like a firearm, always check to see if it's loaded. An engine, always check the oil. I know most on this board would have check the oil in that snow blower. But it's just a reminder.
Call Equipitron, Floyd in tech support will give options, he's great!
cleverlever
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You might get lucky and find a mower being junked by a neighbor, friend, coworker or? that you can cannibalize for its long block. It would have to be the same OHV engine with the same shaft dimensions to work. It would just be a case of transferring the working parts from the blown up motor onto the one you found. Just check the one you found to make sure it is not seized and has compression. Good little project for the grandson. Good Luck!
cleverlever
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My experience on seizures not preceded by knocking is the rings seize to the bore. Some times they will free up if you whack the crank shaft bolt or the blade.. Wise to squirt some lubricant in the cylinder first
I have a Snapper 21” self propelled walk behind that is at least 20 years old. About 17 or 18 years ago I replaced the Briggs engine with a Harbor Freight Predator 6 hp engine that cost me $99 at the time. I change the oil every year with full synthetic. It always starts on the first pull (for all these years). Supposedly a Honda knockoff. I had to replace a spring clamp on the hose behind the primer bulb - the only repair I’ve ever made to this engine