Briggs Stratton Stratton blow by


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Old 05-03-21, 05:26 AM
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Briggs Stratton Stratton blow by

Briggs and Stratton engine 14.5hp. I have checked timing marks . I have set valve clearance s but it still blows back out the carburettor . ?
 
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Old 05-03-21, 06:17 AM
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Blown head gasket or burnt valve?
 
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Old 05-03-21, 05:41 PM
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Do the rocker arms both move about the same amount when they open? Often a lobe wears off the cam and causes this effect. I've had two already in the past month or so. Blowing back out the carburetor isn't blowby though. A blown head gasket, damaged cylinder/piston, or worn out rings would cause blowby which is combustion gasses entering the crankcase. Those things won't cause pressure to come back through the carburetor thoug.
 
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Old 05-04-21, 06:09 AM
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I have to disagree with Cheese, the blow by into the crankcase will shoot right into the carb through the PCV port. It will also create a ton of smoke from the oil vapor that accompanies it if it's able to run. Ask me how I know....
 
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Old 05-04-21, 07:35 PM
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That would be very severe blowby, but yes that's possible.
 
 

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