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Many different problems can befall a riding mower. If you suspect that you may have thrown a rod, immediately stop the mower and turn it off.
Smoking Exhaust
If the mower's exhaust is emitting a dark blue or black exhaust smoke, stop the mower. Allow the mower to cool off for an hour or so and check the oil. If the oil has turned black, it may indicate a thrown rod. Smell the oil. If it has a burnt smell then a rod is thrown. It may not be completely off of the rocker arm, but it is holding oil and burning the oil inside the piston chamber. This can lead to an oil fire or even an explosion if the mower continues to run.
- Many different problems can befall a riding mower.
- If the oil has turned black, it may indicate a thrown rod.
Mower Will Not Stay Running
If the mower will not start or starts and then immediately stops the piston rod may be disconnected from the piston. The mower needs the pressure that builds up in the piston chamber to keep running. If this cannot happen because the mower has no pressure, it will stop. If allowed to run in this condition it will eventually lock up the engine which will lead to expensive repairs.
Extreme Banging from the Engine
When the mower engine is making a loud banging sound this is the easiest way to know that you have thrown a rod and pushed it through the piston. Imagine hitting a cast iron skillet with a hammer and you can hear the same sound. If you hear this, stop the mower immediately, as the rod can eventually come loose and go through the piston head becoming a very dangerous projectile. If this is happening, there will also be a leak of oil through the seals on the piston cover.
- If the mower will not start or starts and then immediately stops the piston rod may be disconnected from the piston.
- If you hear this, stop the mower immediately, as the rod can eventually come loose and go through the piston head becoming a very dangerous projectile.
Ways to Avoid these Problems
Check the oil before every cutting. The main reason a rod is thrown is because of a lack of oil on the piston head. When the piston head becomes too hot it will seize the engine and cause the rod to break off inside the piston chamber. Have the mower examined at least twice a year. Simple diagnostics by a trained professional will reduce the possibility of an interior problem. Change the oil and the oil filter (if the mower has one) at least every 40 hours of use. Dirty oil can also cause a piston to seize.
- Check the oil before every cutting.
- Change the oil and the oil filter (if the mower has one) at least every 40 hours of use.
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