Briggs & stratton problem

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mrfred54

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Joined
May 10, 2013
Messages
49
the motor on my lawnmower is blowing oil out the vacuum fuel pump. anyone know what causes this and what is the fix. this is a 17HP model #31F777
 
The pros will respond...Perhaps "blowby" from worn ,broken rings or bore wear. Combustion is not fully captured in the chamber and some is going downstairs where it pressurizes the oil which looks for a way out? (home owner talking).
 
another possibility is worn valve guide seats. they be worn enough that you may be getting blowby on them
 
Where are the valve guide seats? I suspect a blown head gasket.
 
mrfred54 said:
the motor on my lawnmower is blowing oil out the vacuum fuel pump. anyone know what causes this and what is the fix. this is a 17HP model #31F777
Click to expand...

found the problem..... breather tube was off at carb. must have been off all winter and a spider had a web inside the tube and was plugged . didnt know this when i put it back on the carb. and started mowin this year. when i took crankcase breather apart to look at the check valve and didnt see anything wrong, i look into the breather tube and got lucky to even see the plug web with all kinds of crap stuck to it. run great now and no oil leak
 
So it wasn't blown head gasket then....! well done good for you.:thumbsup:
 
mrfred54 said:
found the problem..... breather tube was off at carb. must have been off all winter and a spider had a web inside the tube and was plugged . didnt know this when i put it back on the carb. and started mowin this year. when i took crankcase breather apart to look at the check valve and didnt see anything wrong, i look into the breather tube and got lucky to even see the plug web with all kinds of crap stuck to it. run great now and no oil leak
Click to expand...

I'll have to add that one to my flowchart..."did ya check for spiders in the breather tube?" "Doggone if I haven't seen it happen a dozen times!!" :laughing: Do you know what kind of a spider? Maybe the manufacturers can come up with some sort of OEM repellant :laughing::laughing:
 
Ifixdit said:
I'll have to add that one to my flowchart..."did ya check for spiders in the breather tube?" "Doggone if I haven't seen it happen a dozen times!!" :laughing: Do you know what kind of a spider? Maybe the manufacturers can come up with some sort of OEM repellant :laughing::laughing:
Click to expand...

The spider repellant is added to the factory installed smoke.
 
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