Hartter
I have an old mower that keeps fouling it's plug. I have stripped the motor down, but do not understand how all the oil is reaching the plug. There looks to be a small groove in the piston head, but looks machined. Possible, that i need new rings? Also i do not see where gaskets come into play between piston and plug. So it would almost have to be the rings. I think but do not know.
Answer
Piston rings do not seal completely. They are open ended by design. When the engine is off oil can leak past the rings and into the cylinder area. The engine is designed so that when the mower is level the oil (if at it's proper level) will stay in the pan BUT if the mower is a an angle toward the head, the oil can and will run into the cylinder. Every year people wind up taking their mowers into the shop for oil in the head after the hung the mower up from a wall or shoved it into a corner at an angle.
Yes, bad rings could cause oil fouling but would more likely cause excessive blow by and thus oil out the breather system or seals. Stuck rings could do that too, while it is apart make sure to clean the ring grooves so the rings float freely.
Worn valve stem/guide could cause oil to be sucked through the guide and into the engine but would also allow the valve to not seat well and loss of power.
Another question is, how do you know it is the oil fouling the plug? A carb set too rich due to leaky/worn carb parts could also cause plug fouling.
If this mower is precious to you, put new rings, connecting rod, valves, guides, grind the valve seats and don't forget new gaskets and seals.
Piston rings do not seal completely. They are open ended by design. When the engine is off oil can leak past the rings and into the cylinder area. The engine is designed so that when the mower is level the oil (if at it's proper level) will stay in the pan BUT if the mower is a an angle toward the head, the oil can and will run into the cylinder. Every year people wind up taking their mowers into the shop for oil in the head after the hung the mower up from a wall or shoved it into a corner at an angle.
Yes, bad rings could cause oil fouling but would more likely cause excessive blow by and thus oil out the breather system or seals. Stuck rings could do that too, while it is apart make sure to clean the ring grooves so the rings float freely.
Worn valve stem/guide could cause oil to be sucked through the guide and into the engine but would also allow the valve to not seat well and loss of power.
Another question is, how do you know it is the oil fouling the plug? A carb set too rich due to leaky/worn carb parts could also cause plug fouling.
If this mower is precious to you, put new rings, connecting rod, valves, guides, grind the valve seats and don't forget new gaskets and seals.
How do i remove the spark plug from my lawn mower?
Jacob
I have a OLD lawnmower and i bought it from jensen and pilgard all it says in trimmer on it and its red and green and theres a white wire were the motor is how do i remove it
Answer
Remove the connector on the end of the plug. If the plug looks to be rusty, give it a shot of WD-40 & let it sit for about 1/2 hour. It would be good to already have a spark plug wrench and a small wire/brass brush.
The brush with the wd-40 can clean up the plug if necessary. Then take your plug wrench on a ratchet & give it one quick turn counter clockwise. If you feel it loosen...continue in that direction. If you don't feel it break loose, turn it once quickly clockwise, then repeat in counter direction. Back & forth until you feel it loosen.
You do not want to force it hard in either direction past the once quick motion. Doing so can cause the ceramic core to fracture & break & then you really have a big mess on your hands.
In instances like this...brute force is not your friend. Once quick...one way then the other until you can easily unscrew it counter clockwise. I cannot stress this enough.
Remove the connector on the end of the plug. If the plug looks to be rusty, give it a shot of WD-40 & let it sit for about 1/2 hour. It would be good to already have a spark plug wrench and a small wire/brass brush.
The brush with the wd-40 can clean up the plug if necessary. Then take your plug wrench on a ratchet & give it one quick turn counter clockwise. If you feel it loosen...continue in that direction. If you don't feel it break loose, turn it once quickly clockwise, then repeat in counter direction. Back & forth until you feel it loosen.
You do not want to force it hard in either direction past the once quick motion. Doing so can cause the ceramic core to fracture & break & then you really have a big mess on your hands.
In instances like this...brute force is not your friend. Once quick...one way then the other until you can easily unscrew it counter clockwise. I cannot stress this enough.
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