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B&S seized 5.0 on push mower

#1

S

Safehorses

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


#2

R

Rivets

First thing to do is check the oil level, no oil probably seized. Has oil may be seized, but need to check further. Remove the spark plug and try again with no plug. If it turns over reinstall plug and try again. Let us know the results of you tests and we’ll tell you how to proceed. When you post back include the model, type and code numbers stamped on the engine cover.


#3

S

Safehorses

Rivets said:
First thing to do is check the oil level, no oil probably seized. Has oil may be seized, but need to check further. Remove the spark plug and try again with no plug. If it turns over reinstall plug and try again. Let us know the results of you tests and we’ll tell you how to proceed. When you post back include the model, type and code numbers stamped on the engine cover.
Click to expand...
Before I tried to start it I checked the oil. I was surprised the oil was so clean. Looked like it had just been changed.
Took spark plug out still couldn't pull cord.
Model. Type. Code
124702 - 3106-01. 92032156
Thank you your help


#4

R

Rivets

Sounds to me that the mower was run without oil. After it seized the user put in fresh oil to hide their mistake. Sometimes these units can be saved, but your odds are 50/50. If you want to give it a try, this is what I would do. You really have nothing to lose.
1. Remove the spark plug.
2. Tip the mower on its side, carb/air filter up.
3. With gloves on try to turn the blade backwards, meaning you are pushing again the sharp edge.
4. If this doesn’t move it, take a block of wood against the cutting edge and give it a few good whacks with the biggest hammer you have. If it is not seized too bad it should free up.
5. If you can’t get it to move you are out of luck, junk.
6. If you free it up and it moves freely, tip the mower back up and pull the recoil a dozen times, no plug.
7. Install the spark plug and see if it starts.


#5

StarTech

StarTech

Make sure the engine brake cable (EBC) is releasing the flywheel brake. Or if the cable is not present make sure that the brake is crippled.

These engine brakes are often overlooked as a possible failure point.


#6

R

Rivets

Thank you Star, it come so natural that I forgot about that.


#7

S

slomo

Oh and welcome to the forum.


#8

sgkent

sgkent

what has already been said and, when was the last time it ran, and where has it been sitting since then? Is this a new mower to you? What is the history of maintenance on it?


#9

S

Safehorses

Rivets said:
Sounds to me that the mower was run without oil. After it seized the user put in fresh oil to hide their mistake. Sometimes these units can be saved, but your odds are 50/50. If you want to give it a try, this is what I would do. You really have nothing to lose.
1. Remove the spark plug.
2. Tip the mower on its side, carb/air filter up.
3. With gloves on try to turn the blade backwards, meaning you are pushing again the sharp edge.
4. If this doesn’t move it, take a block of wood against the cutting edge and give it a few good whacks with the biggest hammer you have. If it is not seized too bad it should free up.
5. If you can’t get it to move you are out of luck, junk.
6. If you free it up and it moves freely, tip the mower back up and pull the recoil a dozen times, no plug.
7. Install the spark plug and see if it starts.
Click to expand...
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.


#10

S

Safehorses

sgkent said:
what has already been said and, when was the last time it ran, and where has it been sitting since then? Is this a new mower to you? What is the history of maintenance on it?
Click to expand...
I have no idea the last time it was started. No idea if any maintenance was done to it. It's a older mower but looks almost new.
I picked it up last Fall. Checked the oil, put gas in it and tried to pull the cord. Couldn't pull the cord at all. Disnt want to break it so i emptied the gas out put it up and here I am.
You guys are great! Thank goodness for forums and you people helping dummies like me.


#11

S

Safehorses

slomo said:
Oh and welcome to the forum.
Click to expand...
Thank you!


#12

sgkent

sgkent

i'd be spraying a couple squirts of penetrating oil thru the spark plug hole down the cylinder walls because it sounds like the piston rings were rusted to the cylinder. Running that without some lubrication will only tear up the rings.


#13

S

Safehorses

sgkent said:
i'd be spraying a couple squirts of penetrating oil thru the spark plug hole down the cylinder walls because it sounds like the piston rings were rusted to the cylinder. Running that without some lubrication will only tear up the rings.
Click to expand...
I'll do that. Thank you.


#14

R

Rivets

If you try putting oil in the cylinder do it very sparingly. Now that it is free really don’t need to, as the engine oil will start doing its job. To much oil at this point will not allow the plug to fire.


#15

S

Safehorses

Rivets said:
If you try putting oil in the cylinder do it very sparingly. Now that it is free really don’t need to, as the engine oil will start doing its job. To much oil at this point will not allow the plug to fire.
Click to expand...
OK thank you.


#16

R

Rivets

Because you were able to free it up using a block of wood and hammer, I suspect that the rings are fine and that the rod was probably frozen on the crankshaft. If you get it running I suggest you change the oil after 2 hours use to remove any debris in the oil. No need to put any oil in the cylinder, just my opinion.


#17

S

Safehorses

Rivets said:
Because you were able to free it up using a block of wood and hammer, I suspect that the rings are fine and that the rod was probably frozen on the crankshaft. If you get it running I suggest you change the oil after 2 hours use to remove any debris in the oil. No need to put any oil in the cylinder, just my opinion.
Click to expand...
Thank you


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