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**K-B** · 05-02-2008, 12:40 PM

It's not necessary to put heavier oil in it. Use SAE30.
You asked about how oil can get into the crankcase if the piston rings aren't broken. It goes through the valves, if they aren't completely sealed (and chances are they aren't, unless the engine happens to be exactly at top dead center), and in the valve chamber there's a weep hole into the crankcase (to allow oil from the crankcase to lubricate the valves). The gas seeps right into the crankcase, raising the oil level.
There's a couple things that can cause this. Damaged or worn needle/seat, damaged float, or a bent tang on the float. What you can do is remove the float from the carburetor, hold it up to your ear and shake it. If you can hear sloshing inside, the float has a leak in it and is the cause of the problem. If that's not the problem, set the float height (if you post the model & type numbers, I can tell you what to set it at). And maybe replace the needle & seat.

05-02-2008, 12:40 PM	#10 (permalink)
K-B Moderator/Gearhead Join Date: Oct 2005 Location: NY Posts: 2,725 OS: Ubuntu 8.04 My System	Re: 6.75 hp briggs no start It's not necessary to put heavier oil in it. Use SAE30. You asked about how oil can get into the crankcase if the piston rings aren't broken. It goes through the valves, if they aren't completely sealed (and chances are they aren't, unless the engine happens to be exactly at top dead center), and in the valve chamber there's a weep hole into the crankcase (to allow oil from the crankcase to lubricate the valves). The gas seeps right into the crankcase, raising the oil level. There's a couple things that can cause this. Damaged or worn needle/seat, damaged float, or a bent tang on the float. What you can do is remove the float from the carburetor, hold it up to your ear and shake it. If you can hear sloshing inside, the float has a leak in it and is the cause of the problem. If that's not the problem, set the float height (if you post the model & type numbers, I can tell you what to set it at). And maybe replace the needle & seat. __________________ Registered Linux User #435503 Don't let socialists take over this country. Vote Nobama 2008!