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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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I purchased a 14" &20" chainsaw Model 8901/8902 and I am having difficulty pulling cord. It seems to lock. What could be the problem?


That is a good and bad sign. When a motor wears out and looses compression it gets very easy to pull. New motors should pull hard and be choppy or seem to "lock" however - you *MUST* carefully review your fuel mixture to ensure you are adding enough oil to the mix - if you used straight gas without adding oil you will burn the motor up and experience difficult pulling. Simple test - remove the spark plug - give it a good pull it should be liquid smooth with no binding anywhere on the pull. Report your results.

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My mcculloch 10-10a won't turn-over


That sounds like hydro lock. Usually happens when an engine gets flooded for various reasons. But you would see fuel coming out of the spark plug hole when pulling it over. Does it turn over at all with the plug in it? As crazy as it sounds an incorrect plug (length) could cause contact with the top of the piston so the engine would turn over fine up to the point of the piston coming to the top of the stroke. Another wild guess would be an exhaust port/muffler so plugged that it won't let anything out.

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It is posible the crankcase is full of fuel and causing a hydraulic lock, rmove the spak plug, turn the saw up side down, crank the engine until fuel stops exuding from the cylinder, also check it is the correct plug for the saw, if it is too long it could be touching the piston crown, if all else fails it will need a de coke as there may be excess carbon on top of the piston.

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Try some penetrating oil through the spark plug rotate the piston several times and re-apply the penetrant. Lean the saw sideways with the fuel side down and the exhaust side up, overnight.
Pull the start cord (the next morning) several times. Give the cylinder a quick shot of starting fluid and re-install the spark plug.
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Best regards, --W/D--

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1 Answer

Very hard to pull start.


Two possibilities--one, the engine is flooded and the spark plug needs to be removed, then open the throttle and pull the engine through smartly several times to expel excess fuel. Check the air cleaner for plugging. Second, the engine may have been run without oil in the fuel which will result in the piston /ring(s) scoring itself and the cylinder wall severely. Remove the muffler and watch the piston as it travels the cylinder while pulling the engine through slowly. Any heavy scoring will necessitate replacement of the cylinder, piston, and ring(s)--an expensive process if you farm it out. Hope this helps!

Nov 09, 2010 | Chainsaws

1 Answer

I have a mac 110 i try to start but it's won't even turn over .I can't pull the string out


Try removing the spark plug, then try pulling it through. If ok, then open the throttle, choke off, and ignition off. Pull the starter through a number of times to expel excess fuel from the engine. Check for spark at the plug--if blue and snappy, replace it and try for start. If removal of the plug doesn't allow the starter to be pulled, remove the starter assembly from the case and try to pull the cord out. If ok, then try to turn the flywheel by hand. If still locked, the interior of the engine must be serviced--probably, the engine was run on straight gasoline with no admixed oil. In that case, the cylinder, piston, and ring(s) must be replaced. Not a cheap repair even if you do it yourself. Hope this helps!

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1 Answer

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Check the fuel filter, air cleaner, and muffler for plugging. While the muffler is off, inspect what you can of the piston and cylinder wall for any severe scuffing. Check the fuel lines for condition. Make sure that the carburetor fasteners are tight. If still nothing, remove the bottom chamber from the carburetor and check the diaphragm and fuel metering valve. The diaphragm should be flexible without any holes or cracking. The fuel metering valve has a fine rubber tip on the needle that must be in good condition. Make sure that the primer (if equipped) will pull fuel through the carburetor when pumped several times. When you pull the starter through, does the engine seem to have good compression? Try squirting some fuel mix into the spark plug hole and see if it will pop several times. Hope this helps!

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2 Answers

I cant pull the cord to start it. it wont budge like its stuck


It could be Compression Lock, which basically means there's a vacuum being formed or too much pressure formed in the combustion chamber that won't allow you to turn the motor over. Often there is a button on the side of the motor that you can push in to relieve the pressure, on most units it's a small red push button directly on the engine. If it doesn't feature this, you can remove the spark plug and reinsert it which should effectively do the same thing. Hope this helps!

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Sounds like you may have a flooding problem, when gasoline gets into combustion chamber in liquid form it causes a hydrolic lock. Try emptying the tank, remove the plug and pull it till all the loquid fuel is out, then put the plug back in and try to start with just the fumes in the talk. If that does not help, remove the muffler and inspect the ehaust ports for carbon build up[ and of courde scoring of the piston or hung ring.

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