Husqvarna will crank but won't Start.
- Thread starter sam1967
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I believe your son hit something and caused the flywheel key to break, the engine turning over out of time caused the push rods to bend. It's not the eng of the world, but hopefully that's the extent of the problem. Check youtube for some how-to videos. You can use a soft faced mallet to tap on the flywheel while turning it by hand and it should pop loose. Otherwise auto parts stores will let you borrow a puller.
You can get a free service manual here. https://briggs-and-stratton-repair-manual-pdf.pdffiller.com/
I think your right about hitting something. I think the most trouble thing is the steel push rod for the exhaust on left side isn't there anymore. I can't see any metal in the head/cylinder, nothing. I'm thinking there might be more damage now that I couldn't find it. Have you ever heard of a push rod going back into the piston cylinder?
That is a Briggs & Stratton.
More than likely from what I am reading you do have a problem with the push rod having bent / falling out of place. This is a fairly well documented issue, usually the reason is overheated engine. The cheap repair is to buy all new pushrods and not sure if this engine has guides but if it does then those too... Reinstall everything, properly adjust the valves, put it back together and then clean all the cooling fins and everything around the engine of accumulated dirt and grime (as this is what may have led to overheating in the first place), and last but not least hope that took care of it.
grumpyunk
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You can use a magnet to poke around down the channel where the missing pushrod used to be. Use a flash light and magnet to see if you can find the pushrod. If left internal, it can damage the other parts such as cam gear, governor, and more. If they are not already damaged.
The pushrod likely bent when the rocker arm ran into the top of the valve guide. Unless the valve seized in the guide and would not move, the only other thing that comes to mind to stop the rocker arm from moving is the top of the valve guide. The guides are pressed into the cylinder head. If the head gets too hot, the guides can migrate upward and finally move enough that they collide with the rocker.
You may(should) remove the blower shroud covering the engine & flywheel. It may be that you have a good accumulation of grass clippings, or even a mouse house that are blocking airflow over the finned area of the engine. Without the cooling airflow, the parts get hot and move around in an uncontrolled manner. Damage ensues.
You can compare valve guide height by measuring the distance from the top of the cylinder head(base of the valve spring) to the top of the guide. As a general rule, they should all be the same. If one is higher than the others, it has moved and is likely the cause of the bent push rod. Replacing with a new push rod will NOT fix the problem if the guide has moved, it will just re-occur almost instantly.
So, remove and clear the cooling, check guide height, and if the guides have moved, repair. There are articles and likely YT videos that explain how to push the guide to its proper location, add some Loctite before doing so and finally use a punch to 'stake\ the guide in place. Many report long term success by doing this.
You will have to remove the head to push the guides back as the valve(s) must be removed prior.
tom
The pushrod likely bent when the rocker arm ran into the top of the valve guide. Unless the valve seized in the guide and would not move, the only other thing that comes to mind to stop the rocker arm from moving is the top of the valve guide. The guides are pressed into the cylinder head. If the head gets too hot, the guides can migrate upward and finally move enough that they collide with the rocker.
You may(should) remove the blower shroud covering the engine & flywheel. It may be that you have a good accumulation of grass clippings, or even a mouse house that are blocking airflow over the finned area of the engine. Without the cooling airflow, the parts get hot and move around in an uncontrolled manner. Damage ensues.
You can compare valve guide height by measuring the distance from the top of the cylinder head(base of the valve spring) to the top of the guide. As a general rule, they should all be the same. If one is higher than the others, it has moved and is likely the cause of the bent push rod. Replacing with a new push rod will NOT fix the problem if the guide has moved, it will just re-occur almost instantly.
So, remove and clear the cooling, check guide height, and if the guides have moved, repair. There are articles and likely YT videos that explain how to push the guide to its proper location, add some Loctite before doing so and finally use a punch to 'stake\ the guide in place. Many report long term success by doing this.
You will have to remove the head to push the guides back as the valve(s) must be removed prior.
tom
Fuel, spark,or air. check the choke linkage and air filter. Also check the fuel hose at the carburetor for fuel. Could be a weak fuel pump. This exact same thing happened to me. Was running fine, then ran out of gas and didn’t want to start. The pipe going from carburetor to fuel pump had vapor lock. It was a weak fuel pump, even though everybody told me it couldn’t possibly be that
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just got mine going. The little hose from the valve cover to the fuel pump had a crack in it. Taped and glued the crack, and it runs now. If you remove the valve cover to fix or replace the hose, notice that the valve cover will need to have a sealant applied.