he valve stuck in the open position? If so how can it be fixed?
24 Hp 48″ Deck Yard Tractor

Experienced gardeners share their insights in answering this question :
Unable to answer if valve opened or not but does sound like ur bottom valve is bent or piston made contact and bent it to fix need to remove head and replace valve also need to inspect piston face is not damaged from possible contact

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

When an engine becomes too hot, the metal components, including the pushrods, expand due to thermal expansion. If the engine exceeds its designed operating temperature, the pushrod may bend as it struggles to accommodate the increased length caused by expansion. Another factor to look for is valve adjustment.
Most of the time pushrods are bent when the engine is over-revel and the valve hits the piston. Usually this is caused by a bad or mis-adjusted rocker or lifter be it ever so slight.
The bottom end of a pushrod is fitted with a lifter, upon which the camshaft makes contact. The camshaft lobe moves the lifter upwards, which moves the pushrod.
Bent valves will not only damage pistons but also valve guides, camshafts and valve train components. include bent valves, broken pistons and damaged engine heads.
The cause of the bent push rod is the valve guide thimble is only press fitted, and easily loosens when the engine reaches a certain temp. The thimble then pushes outward, restricting the movement of the valve spring, eventually causing the push rod to bend.
A sure indication that the pushrod is too long is when it takes more than 1 full turn to seat the rocker past the zero-lash point. Though we have successfully run pushrods with more than 1.5 turns, more than 2 turns can actually hold the valve open once the lifter is pumped up with sufficient oil pressure.
The servo shaft rotates clockwise, and the servo arm rotates along with it. The pushrod translates (moves) to the right and slightly down as it is pushed by the servo arm.
The force the pushrod exerts is the product of the amount of air pressure applied in psi, and the area of the diaphragm in square inches.
The pushrod deflects or flexes upon valve opening and then again just prior to valve closing. As the cam tries to move the valvetrain to open the valve, it has the weight of the valvetrain against it and in the case of the exhaust valve, cylinder pressure also.
The symptoms of bent valves include an engine that won`t start, an erratic engine when idling, lack of engine power, a knocking noise from the engine and excessive exhaust fumes. Engine valves are responsible for controlling the fuel delivery and gas removal in your engine.
A mildly bent rod would affect compression but generally a bent rod will cause engine balance problems at best and serious engine problems at worst. If the rod is truly bent the engine should be disassembled and the rod replaced.
The most common valve failures are bent or broken valves due to contact with the piston or another object in its path. A burnt valve is another type of failure that happens when things go wrong in the valvetrain.
Expect to shell out around $3000 to $5000 for a rod knock repair, depending on all these factors. However, the cost can go beyond $10000 if an engine replacement needs to be done. Rod knock repair requires replacing engine components like gaskets, seals, connecting rod bearings, etc., which are complex and expensive.
Knocking noise: A knocking sound is one of the more common signs of a failing connecting rod, which is why it`s referred to as rod knock. This knocking tends to get louder as you speed up, but it may go away once oil starts to circulate and lubricate the failing connecting rod.

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My 24hp Briggs and Stratton ohv engine has bent push rods on one side. The top valve can be pushed in but the bottom one will not push in. Is the valve stuck in the open position? If so how can it be fixed?
ANSWER : Unable to answer if valve opened or not but does sound like ur bottom valve is bent or piston made contact and bent it to fix need to remove head and replace valve also need to inspect piston face is not damaged from possible contact

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How do I remove and clean air filter? – Briggs & Stratton Lawn-Boy 10640 20-Inch 6.5 HP Gas Powered Lawn Mower
ANSWER : There should be a square of plastic on the side of the engine which is opposite of the muffler. It has a small hex head with a slot cut in it. Remove this plastic cover and the air cleaner should be inside of it.

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Hard hitting on compression stroke when starting
ANSWER : If its the 21 or 20 hp OHV single briggs. Adjust vales to .004. The cam also has a decompression that breaks, Causing hard start. So if valves are adjusted and u still have problem. “Could” be cam, remove bottom cover and inspect cam. new cam about 75 to 100 bucks.

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Wshat is the valve clearence for a 24 hp briggs and stratton engine model 446677 type 0470E1 code 050405yh
ANSWER : About a mm or .004″.

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I have a 12.5 Briggs & Stratton and I can not get the timing marks on the crankshaft and cam gear to line up when the piston is at top dead center.
ANSWER : Timing on briggs is piston past tdc by 6mm….also see if you are 360deg out?

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How many cycles is a 6.25 hp Briggs & Stratton engine ?
ANSWER : 4 cycle.

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17 HP Briggs & Str lawn mower engine that is smoking a lot –
ANSWER : Compression test it can either rent or buy one should be over 90psi!!!

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Won’t crank over seems like to much compression ?
ANSWER : OHV? First try adjusting the valves too much clearance will the decompressor to not work. Now the decompressor can also fail but try the valve adjustment first.

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