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So this is what a broken flywheel key is like...

#1

1

128MB

Mower started badly today but I did manage to do half my lawn then suddenly putputput and it died.

I had fuel, spark and compression so lastly timing...I did not hesitate, drained the fuel tank, took of the cover and looked at the flywheel.

Now i need to find a new 3x5mm key.

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#2

Mower King

Mower King

128MB said:
Mower started badly today but I did manage to do half my lawn then suddenly putputput and it died.

I had fuel, spark and compression so lastly timing...I did not hesitate, drained the fuel tank, took of the cover and looked at the flywheel.

Now i need to find a new 3x5mm key.

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Yep, that is a sheared key, just make sure you replace it with an Alum key & not Steel!


#3

Hammermechanicman

Hammermechanicman

128MB said:
Mower started badly today but I did manage to do half my lawn then suddenly putputput and it died.

I had fuel, spark and compression so lastly timing...I did not hesitate, drained the fuel tank, took of the cover and looked at the flywheel.

Now i need to find a new 3x5mm key.

View attachment 53714 View attachment 53713 View attachment 53715
Click to expand...
Looks like you need to tighten up your nuts.?


#4

1

128MB

Why is that. my other briggs v-twin has a steel replacement.
I think this is steel also. i found 2 replacement but no stats on them.


#5

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128MB

Hammermechanicman said:
Looks like you need to tighten up your nuts.?
Click to expand...
yeah but i have a electric pto so how to block the crank from turning ?


#6

Mower King

Mower King

128MB said:
Why is that. my other briggs v-twin has a steel replacement.
I think this is steel also. i found 2 replacement but no stats on them.
Click to expand...
If it sticks to a magnet, it's steel,if not, it's Alum. People have this misconception that the flywheel key holds the flywheel from turning / spinning on the crankshaft.


#7

Hammermechanicman

Hammermechanicman

You can use a big screwdriver wedged in the starter ring gear and a solid part of the engine. Impact wrench. Strap wrench on flywheel. Remove spark plug and insert some rope/cord into the cylinder. Rorate engine till piston contact cord as a piston stop.


#8

Mower King

Mower King

Hammermechanicman said:
You can use a big screwdriver wedged in the starter ring gear and a solid part of the engine. Impact wrench. Strap wrench on flywheel. Remove spark plug and insert some rope/cord into the cylinder. Rorate engine till piston contact cord as a piston stop.
Click to expand...
If you use the rope trick, make sure both valves are closed at TDC or you could bend a valve. I personally like the Impact but, you do have to know your Impact or....other problems might occur!


#9

1

128MB

should i torque it or a one good elbow twist enough, it came lose very easily before ...


#10

1

128MB

mower king said:
If it sticks to a magnet, it's steel,if not, it's Alum. People have this misconception that the flywheel key holds the flywheel from turning / spinning on the crankshaft.
Click to expand...
its tapered shaft so its the friction of the 2 bodies that keep it together i guess. much like the 50ton overhead crane wheels at work. iv seen them come loose by itself and some even broke off.


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