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Q: What are signs of bad piston and rings on lawn mower engine?
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Oil coming out of the dipstick of a 1979 Ford F150 302.?

Blow-by Engine showing signs of wear (rings) Try replacing PCV valve oil coming from dipstick ,means the engine is pressurizing .this is usually caused by a broken or stuck piston ring.this is a major repair


What are signs of a bad piston?

Excessive smoke from the exhaust, and an engine miss. If you remove a plug wire while the engine is at idle and the noise is gone or almost gone then that would indicate the cylinder that the piston is bad.


What are engine wear signs?

The signs that i look for are: The engine uses oil - The oil pressure drops(worn bearings) - Fouled spark plugs - Oil in the air filter housing (caused by worn piston rings, called blow-by, a bad sign) - Moisture on the dipstick - Bad compression - A failed leak down Test - a plugged Catalytic Converter - Failing a "Smog" test


What are the signs of bad piston rings?

Blue smoke out of the tail pipe, low compression, excessive blow-by, excessive motor oil consumption, loss of power.A more detailed answerIf all your piston rings are badly worn you'll have blue/black smoke coming from the exhaust every time you accelerate and your engine oil dipstick will show the oil being used up much faster than usual, like you will have to top-up with a pint of engine oil every 300-500 miles. If only one or two pistons have worn-out piston rings the symptoms would not be so bad.It all depends on how well the engine has been driven and maintained. On a modern engine, say less than 15 years old, if the oil was changed regularly and the engine was never thrashed (over-revved) then it is unlikely you'll get worn piston rings until the engine has done 150 thousand miles, or much more if it's a diesel.NoteOn modern engines with overhead camshafts, if the valve-seals are worn you'd also get blue/black smoke coming from the exhaust every time you accelerate and would be burning up engine oil fast. Even if the engine was driven well, and its oil was changed regularly according to the recommended service intervals, its valve-seals are still liable to wear out faster than its piston rings. How long the valve-seals last will depend most of all on the quality of the materials used by the engine manufacturer and, to a lesser extent, on the engine size: on some makes of engine the valve seals could normally need replacing every 100 thousand miles, on others they could last 300 thousand miles or more.


What are the signs of piston failure?

heavy Knocking, and loss of compression.


What are the signs of bad piston?

Blue smoke out of the tail pipe, low compression, excessive blow-by, excessive motor oil consumption, loss of power.A more detailed answerIf all your piston rings are badly worn you'll have blue/black smoke coming from the exhaust every time you accelerate and your engine oil dipstick will show the oil being used up much faster than usual, like you will have to top-up with a pint of engine oil every 300-500 miles. If only one or two pistons have worn-out piston rings the symptoms would not be so bad.It all depends on how well the engine has been driven and maintained. On a modern engine, say less than 15 years old, if the oil was changed regularly and the engine was never thrashed (over-revved) then it is unlikely you'll get worn piston rings until the engine has done 150 thousand miles, or much more if it's a diesel.NoteOn modern engines with overhead camshafts, if the valve-seals are worn you'd also get blue/black smoke coming from the exhaust every time you accelerate and would be burning up engine oil fast. Even if the engine was driven well, and its oil was changed regularly according to the recommended service intervals, its valve-seals are still liable to wear out faster than its piston rings. How long the valve-seals last will depend most of all on the quality of the materials used by the engine manufacturer and, to a lesser extent, on the engine size: on some makes of engine the valve seals could normally need replacing every 100 thousand miles, on others they could last 300 thousand miles or more.


Why oil in engine cylinder?

Bad valve? Broken piston ring? It could be a broken valve, but you would have other signs if that were the problem. Most likely it is nothing more than valve stem seals being bad.


What will the heads have to do with a 350 Chevy smoking and using oil?

Valve guides and/or valve seals can be worn. Allows oil to get into the combustion chamber.Oil consumption and smoking are signs of either bad piston rings or bad valve guides/valve seals.A compression check on each cylinder can help determine which.


What can go wrong with a ten year old Ford Fiesta?

Actually, the same things that go wrong with any car.....Brakes, Hoses, Belts, etc etc. But the main thing I would look for is if oil is seeping out from underneath the Valve Cover, dripping down over the front area of the engine, spark plugs, etc. Start the engine, open the Oil Filler Cap, and if there is significant air flow coming OUT of this opening then these are pretty sure signs that the Piston Rings are bad, or worse. HTH Chuck, CABGx3


What is wrong if a 98 Mountaineer 40 V6 is running hot with oil in the air filter and the guy at AutoZone also said you had no pressure in the crank case?

Unfournately, those are signs that your engine is worn and will need to be rebuilt, or replaced. Those are signs of worn rings your probably getting little or no compression.


Why does oil leak in spark plug hole on Mazda mpv?

if one plug has signs of oil leaks its probably piston rings. only air and fuel should mix in the part of the chamber the plug ignites. so make sure you don't just have too much fuel entering the chamber


What are some of the symptoms of engine knock in a 77 Trans Am other than a knocking sound?

Engine "knock" is preignition or detonation of the air-fuel mixture before the piston is in power stroke position. It is usually caused by a lean fuel mix. So to check for preignition, check your plugs for signs of lean running.