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Mower wont start , no compression when you turn the blade , poulan pro with 5.5 honda , suspect shear pin ? how do you change? thanks BL

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The shear pin might keep it from starting but it will not cause the low compression. More than likely the low compression is a stuck valve which is a job for a professional. Take it to a good servicing dealer for his advice and estimate. Sometimes there is a gasket or a valve problem and a good experience mechanic can tell a lot by just listening to the engine for a few seconds.

Posted on Sep 13, 2009


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It is starting but the blades wont run, why?

Are the belts all in place and check and see if you have a broken shear pin in your drive pulleys. as well try to turn the blades by hand without the engine running and put the blade in gear. If they turn easy while in gear by hand then you know its probably a shear pin.

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Check the blade on the mower. Make sure it is tight and that the shear pin has not been broken. There is a shear pin on the crankshaft that keeps the blade from turning along with the nut that holds the blade on. designed to break off if you hit something with the blade. That is so it doesn't bend the crankshaft. Also make sure that the starter works and that the gear that turns the flywheel has not broken off a tooth.

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1 Answer

Will shearing the Shear Pin on a push mower cause the rope to seize up as if it's locked?

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Mar 28, 2012 | Poulan "Poulan" Push Mower

1 Answer

Hi, while Iwas using my MTD bush mower( model 11A-414E529). the blades hit a metalic object that was not visible (digged in the ground) and the mower stpped. now it is very hard to turn even by hand. not...

You most likely sheared off the shear pin that keeps the driveshaft and the blade in right timing with the motor and piston.
What happens then is the exhaust valves are not open at the time the piston should be in it's correct position where the cylinder pressure and gases can be exhausted at the right time. Also if it did manage to run it would run very roughly. The shear pin is designed to break or "shear" off when a hard object is struck so that you do not ruin your engines drive shaft that attaches to the blade. So what happens is that the shaft turns out of sync with the timing of the engine and putting it simply, the intake and exhaust stages are all messed up and that makes for an engine that is hard to pull over or if it does and it starts, it runs very badly. Spark plugs firing at the wrong times versus the valves and piston positions. Fortunately it is rather easy to replace a sheared off pin yourself. Once you get the new pin, there are a number of YouTube videos that will show you how to replace a sheared pin. Just type in "replacing a Shear pin in a lawnmower engine. It helps to put the brand of the motor of your lawnmower in the search as well. It is actually quite easy for a semi handy man.
Hope that helps. I suspect all the other answers so far pertaining to pull/rip cords are incorrect but that is my opinion only.

Good luck
Kevin Misch

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2 Answers

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Check the blade... it is bent and causes a vibration. if it is not the blade then the motor shaft is bent and that is terminal...if that happened then the mower is junk...


Jul 12, 2010 | Poulan "Poulan" Push Mower

2 Answers

Was mowing and hit a rock now the mower won't start, Blade is turning when I crank it but it doesn't even attempt to start

The flywheel key has sheared or partially sheared which throws off the spark timing. Removing the flywheel and replacing this key will put the timing back in place. If the crankshaft bent at all you will feel a new vibration when it starts. As long as it is not to severe and the blade is not hitting any metal it is ok to run.

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1 Answer

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First and foremost check to see if the crankshaft was bent when you hit the culvert. Remove the spark plug, Tilt the mower on its side at a 45 degree angle and while someone slowly pulls the starter rope see if the shaft where the blade attachs wobbles. If it does then you will need to replace the crankshaft (which can be expensive in some models). If it isn't bent, then the shroud that covers the flywheel is removed along with the other parts in that area and a flywheel "knocker" is used to remove the flywheel. At this point the old key is visible and you can see if it is sheered or not, If it is, then reverse the directions just followed after replacing the flywheel key. Chances are 99% it isn't the key, but the crankshaft.

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1 Answer

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If you hit something hard enough to partially shear the key on the blade adapter, you did shear the key on the flywheel, and it will need to be replaced for the engine to run properly.

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