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Oil in combustion chamber, static locks engine

Oil gets on top of piston locking engine.pull spark plug, turn engine over several times clearing oil out. reinstall plug, after a couple pulls on rope same thing, oil on top of piston. oil has to be chain oil but how is it getting on top of piston?

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  • wlw10 Mar 02, 2009

    have been using this saw for several years and have had no problems. same fuel mixture as always. problem gradually got worse. oil that comes out of cyl.is pure oil not a mixture.thanks for your input.

  • wlw10 Mar 03, 2009

    you asked if engine got more smokey as it ran. as stated before, can't get engine to start because of static lock. can remove plug and pour oil out of cyl. clear cyl. by pulling starter rope several times ,reinstall plug , and after a couple of pulls, static lock again. same procedure with same results.

  • Jim Giesen May 11, 2010

    It then has to come from the pump Im sure this has a diaphram type pump. the diaphram may have a hole in it....Would you say the motor is getting more and more smoky?

  • Jim Giesen May 11, 2010

    Are you sure its bar oil? the only way it can get in is through the pump never heard of it locking the engine. the hole is too small may be fuel/oil...

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It wouldn't be chain oil. That runs through a separate system. It's most likely the oil mixed in your fuel... but if you are seeing it as thick oil, it sounds like your oil:fuel ratio is not correct.

Also, if it isnt firing, you are going to flood the motor after several yanks on the rope. I'd be checking the spark plug for proper operation before looking at anything else.

Posted on Mar 01, 2009

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Excessive oil consumption


First of all, it would be helpful to define what you mean by excessive. How much oil is it using? Do you still have most or all of your power? Is it smoking? Is there oil on the ground under the car after you park for a while?
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Hi Ahuerta, Just about all the vehicles you see on the road work on the principal of what is called a four stroke cycle. When the piston is pulled down during the first stroke, the crankshaft rotates and is joined to the camshaft by a timing belt, chain or gears. As the shafts rotate the camshaft presses down and opens the intake valve(s) and a mixture of fuel and air is drawn into the space on top of the piston called the combustion chamber. The valve closes as the engine continues to rotate and the piston begins to travel upwards, squeezing the mixture until it reaches almost the top of the tube called the cylinder. The combustion chamber is closed and sealed and the spark plug is sparked which causes the fuel mixture to explode, forcing the piston downwards until it reaches the bottom of its travel and begins coming up again. This time the cam shaft opens the exhaust valve, letting out the rubbish left over from when the explosion happened. So as you can now understand the spark plugs work all the time the engine does. Take your vehicle for a diagnostic scan and let your mechanic find out what the problems are. Regards John

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I have oil on my spark plugs I need to know what to look for?


A spark plug shorted by excessive oil entering the combustion chamber is shown below. This is often caused by piston rings or cylinder walls that are badly worn. Oil may also be pulled into the chamber because of excessive clearance in the valve stem guides, or badly worn valve stem seals.

If the PCV valve is plugged or inoperative, it can cause a buildup of crankcase pressure. This condition can force oil and oil vapors past the rings and valve guides into the combustion chamber.

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1 Answer

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This will help. Thanks, please keep updated. please do rate the solution positively .thank you for using fixya

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