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Repair information and troubleshooting for Craftsman-brand riding lawnmowers.

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Engine blown due to low oil - is it worth replacing?

My neighbor gave us their riding lawn mower when they moved, and so we enjoyed it last year. My son especially. No oil was added throughout the summer, and the engine is now toast.

Is it worth replacing? Or should I donate it to our local mower shop?

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There comes a time with everything where the cost of repair exceeds the value of repairing the item (this is a very individual decision). You spent nothing on the machine - if you can put a new motor (or have this one rebuilt) for less than you'd buy a new one seems to me you're ahead.

In future remember -- oil should be drained and replaced each season for lawn mowers and snow blowers. Transmission and/or belts should be checked annually also.

If this answer is acceptable please remember to return and mark it.

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This is a thought an I had it happen to me, if you only ran the mower to the point it ceased up ,there is a Great chance you can fee it up' they will lock up fairly easy and I had it happen once to me and it literally was only low by a few ounces of oil, anyhow tAke the hood off and take the air guard the engine mower ,that's the part where the engine draws air into the shroud to cool down the engine , take it off at the top of the fins and you will have the one large bolt in the middle , that will turn the flywheel if you have a large wrench or a good size socket wrench and this Is better !if you do.Now take a cheap clean oil and pour it down into the motor fins where you can see it spins at,and I also took some spray similar to wd40 and sprayed it pretty thick.Once this happen I let it set a bit and then took the heavy duty socket wench and worked the flywheel back and forth both directions a spec at a time and it seems impossible at first so don't give up ,ALSO CAUTION REMOVE THE PLUGWIRES AND THE SPARK-PLUGS THSI IS MAJOR IMPORTANT FOR EASY IF SPINNING FLYWHEELL AND FOR SAFTEY OF YIPOUR HEALTH......Now that you have done that continue to try moving the FLYWHEELL back and forth and once it seems to be some free work it in the clockwise direction that it normally spins and do the still you feel its pretty ,loose ,now if there's any chance this motor is not ruined ,try to take the key and tap the motor over with the starter and if so keep tapping until it's seems good a free ,then put cleaned plush back in the engine and wires back on and try and fire if up.unless you have bent a rod or broke a piston there is a very good chance to get the engine back to running,after that ,if your super lucky like I was , be a sure to change the old and put on new filter ,and then

Keep a better eye on your mower ,they do use a bit of oil each time u mow ,so I hope your lucky ,if not many times you can replace a part on your own ,these mowers will run a lot of times if things are not perfect ,my best friend has owned a small engine repair shop all of his adult life and ,he's put things back together for folks on a budget and the mowers give a few mower years of service , if your mower has the version which has the oil pump on it like mine does you stand a good chance of freeing it up, even if it did make a noise right before it locked up ,hope this will help you .My new motor replaced is nearly 2 grand so ,that wasn't gonna happen.

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Its too bad you're spelling & pronunciation is so terrible because it sounds like you have some very good information there unfortunately your comment is So difficult to try figure out what you're saying its virtually unreadable

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Dave,

I believe the correct spelling is "your". There are other grammatical errors. Sentence structure could use some work as well.

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Why are you picking on the guys grammar after he spent a lot of time to respond and try to help, pick on me instead!!!!!

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Reading for grammar rather than for the effort Jim put into this answer with his technical knowledge just defies reason! Great Post Jim!

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Phil, depends on your ability and financial resources. Personally, I'd replace the engine since I am frugal:-)

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Just happened to me. I am going to sell/keep for parts

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I do it all the time. I take old lawn mowers, push behind & riding mowers and rebuild them. The problem most people face is what is called "hydraulically locked". What this means is that the engine gives all indications that it is seized up. What takes place is the carburetor has old gas in it and has sat for the winter. Then Spring comes along and you get on your mower you turn the key and it does not try to

start. It will not turn over as the flywheel cannot turn because it is hydraulically locked. What has happened is your seat and float do not seal properly and allows gas into the cylinder and floods the cylinder and the engine itself in the oil compartment with old gas. The best way to check this is to pull your spark plug and then turn the key. The engine will turn over and pump all the gas out of the cylinder. The next thing that needs to take place is that all the oil has to be drained a new oil put in plus you need to pull your carburetor off and thoroughly clean it with carburetor cleaner.

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do it all the time. I take old lawn mowers, push behind & riding mowers and rebuild them. The problem most people face is what is called "hydraulically locked". What this means is that the engine gives all indications that it is seized up. What takes place is the carburetor has old gas in it and has sat for the winter. Then Spring comes along and you get on your mower you turn the key and it does not try to

start. It will not turn over as the flywheel cannot turn because it is hydraulically locked. What has happened is your seat and float do not seal properly and allows gas into the cylinder and floods the cylinder and the engine itself in the oil compartment with old gas. The best way to check this is to pull your spark plug and then turn the key. The engine will turn over and pump all the gas out of the cylinder. The next thing that needs to take place is that all the oil has to be drained a new oil put in plus you need to pull your carburetor off and thoroughly clean it with carburetor cleaner.

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Some Lawn mower engines will seize pretty quickly on low oil, and that is actually a good thing. Before going beserk, on replacement, Try this first. First, fill the engine with oil to the right level, Next, remove the spark plug wire connection, and then the spark plug, then tip the lawn mower up to the spark plug hole is straight up. fill the spark plug hole with diesel, or some kind of penetrating oil, lubricant and let the mower sit for a while. I like a half hour. Next, with the lubricating fluid still in the piston hole, get hold of the mower blade (with gloves on) and start trying to move it back and forth. This may take some effort. If lubricant comes out the exhaust or carb, do your best to turn the blade to move the piston all the way down in the cylinder. Next, add more diesel or penetrating lubricant to the spark plug hole and give it another half hour. Then start rotating the Blade again and keep doing it, Lubricant will spill out, and it will be messy, so make sure plenty of rags and don’t do this where you don’t want lubricant on something. Next, to assure some top engine lubrication, mix up a batch of 2 cycle mix gas, but make the ratio 25 to 1 rather than 50 to 1, fill the gas tank, and shoot a shot of raw gas in the spark plug hole, put in the plug and work at starting the engine. Once you have it running, it will smoke a bit. Let it run the tank of fuel completely and then refill it with 25 to1 again and do it all again! I have done this approach for several engines and have only had one that was not recoverable!

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Son did the same.. however there is a hole in the engine now… can this be repaired/rebuilt?

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To sony n100.The best answer with the amount of information provided is… “it depends!” How the hole got there? How big it is? What caused the hole? And is it in an area that can be repaired?

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I have a similar problem with my single piston lawn mower. It was low on oil and I did not notice. I inspected the engine and removed the valve cap. The problem I seem to have is that the rods connecting to the valves are not moving to open and close the valves. What can I do. Thanks.

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I note a lot of various questions and discussions about holes in engines and some parts not working and valves not moving and just stuff, way beyond Phils original question. What I can suggest is if you cannot technically do the work yourself, and you have identified and evaluated “Cost vs replacement”, and are not real excited about cosmetics, and just really need to keep your tractor or lawnmower shell that hold the motor, there are a ton of used lawn mowers and riding mowers out there with good engines for sale at decent prices. Ya gotta find one for parts that the engine is not the part with a problem and not overpay for it.

There are actually, in many parts of the country, there is a glut on this kind of stuff. If you are, or can be patient, and have the time to wait, something will show up.

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