See full version: Why does my flywheel key keeps shearing
Once the flywheel loosens on the crankshaft, the engine has excessive vibration which can shake the entire vehicle. This vibration can cause damage to the motor mounts, transmission mounts and shake other engine components loose. The flywheel needs to be tightened or replaced once it becomes loose. [links]
Use a bar of some sort and position it on the teeth of the flywheel and the frame. Or, hit your rachet with a hammer fast and hard. It’s kinda like a poor man’s impact gun but it works. You use the flywheels own weight as inertia to keep it from spinning. more
Another cause of a sheared key on a lawnmower is a loose blade. A flywheel that was not tightened sufficiently, or one that has become loose over time can shear the key. A flywheel that is not properly seated on the crankshaft taper will not hold tight. The crankshaft and the flywheel must be free of dirt and grease.
Flywheel bolts = red loctite. But, blue loctite is still loctite so you’ll be fine. [links]
While a solid flywheel can be removed and resurfaced at Mr Clutch Autocentres by undergoing a skimming process, which can save the car owner a lot of money, wear characteristics on a dual-mass type, which tends to be fitted to more modern vehicles, lend themselves more ideally to the good practice of replacement.
If your flywheel is going bad, a smooth pedal is not what you will feel. You may feel vibration as soon as you place your foot on the clutch or when you press down on the clutch. The vibration tends to get stronger as you push on or engage the clutch pedal. [links]
If you do not see a spark, there is an ignition problem. Remove a plug wire and insert an old spark plug or a spark plug tester into the end of the wire (the plug boot). Place the spark plug on a metal surface on the engine, or ground the spark plug tester to the engine. Then crank the engine to check for a spark. here
How do you tell if a flywheel magnets are getting bad? [links]
Additionally, can a flywheel lose magnetism? Yes, a flywheel can lose it's magnetism. This is common with old British style rotors. If left on a metal table or allowed to collect metal hardware while sitting they can lose some of their magnetism. If you have the equipment, rotors and flywheels can be recharged. here
Loss of spark is caused by anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. This includes worn, fouled or damaged spark plugs, bad plug wires or a cracked distributor cap.
Beside above, how do I fix no spark?
Re: flywheel magnets test what is it ?
Re: flywheel magnets test what is it ? here
If these are the magnets that are glued in place, it ie very easy to install these incorrectly, if they were loose and reglued. Each magnet has a north south pole, if you install 1 or 2 of the 6 magnets backwards, you will have weak or no spark. The alternator output will also be low if the magnets are weak or intsalled backwards. more
A word of caution here. On one occasion, I put the compass near a strong magnet and reversed to polarity of the needle of the compass. If one used this compass to return on a hike, the result could be a disaster. This is why I recommend a cheap, disposable compass. here
7.3 This is the typical Tecumseh ignition the is under the flywheel.
7.8 There seems to be a problem obtaining magnets for OH 140 flywheels. I have been looking for suitable replacements with a mechanical form factor and comparable magnet field strength. The best I have come up with are some Rear Earth disk magnets ( Item 1, $4 each, www,wondermagnet.com ) that are 1 inch in diameter and 1/4 inch thick. The original ceramic magnets are .3 inches thick. The disk magnets have a flat surface that is mounted on the curved inside diameter of the flywheel so there being a little thinner provides a comfortable mechanical clearance. Also, since the Rear Earth magnets are stronger, the increased air gap helps off set this. here
7.6 The magnets in the OH 140 / OH 160 flywheel are numbered in red. The even numbered have the NORTH pole in the center while the odd numbered have the SOUTH pole in the center. The important thing here is that there is a pole transition between each magnet since this is what generates the voltage. more
7.7 I use a Gauss Meter to locate the NORTH and SOUTH poles since there is no ambiguity this way. ( The Gauss meter output increases above quiescent with a SOUTH pole and decreases with a NORTH pole.) But I doubt if any body else has a Gauss meter, so I have devised a way here of using an inexpensive compass and a large nail that works fine. The first thing to do is put masking tape on the magnets for the labels. Next, put a 90 degree bend in a spike, #12 or larger, about � inch from the head. Place the head of the spike on the pole to be determined and position the cheap compass behind and close to the point of the spike. For the automotive type compass shown, if the spike is between the compass and your eye, then the letter you see on the compass indicates which pole it is. Figure 7.7 MagnetMeas.jpg . more