Briggs 12 HP Oil in carb

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  #1  
Old 03-19-11, 06:03 PM
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Briggs 12 HP Oil in carb

Engine runs great a couple of minutes, but chokes down as oil shoots into carb. I changed the diaphragm (Valve cover) that connects to carb with a rubber tube. It ran great for a couple of minutes and then the oil blew back into carb. What could cause this?
 
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Old 03-19-11, 06:40 PM
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What model engine is on it? OHV or flathead?
 
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Old 03-19-11, 06:56 PM
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It's a flathead. I don't know the model no.
 
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Old 03-19-11, 07:01 PM
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Is the oil level overfull, and/or does the oil smell like gas?
 
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Old 03-19-11, 07:14 PM
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Oil level is OK. Does not smell like gas. Found model no:289707.
The only way I can see that oil can get into the carb is through the tube that connects to the carb from the valve cover (diaphragm). That's what I changed. Why would it blow out again?
 
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Old 03-19-11, 10:05 PM
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Over-speeding of the engine, an open hole (like the dipstick out or dipstick o-ring missing) or excessive crankcase pressure (blowby from bad rings) would be the only realistic reasons.
 
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Old 03-20-11, 04:48 AM
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The o-ring you are refering to is on the cap of the dipstick or at the bottom where the dipstick housing connects to the fill/drain pipe?
There is no ring blow-by that is visible. It is a low-hour solid engine. Just not run in a couple of years.
 

Last edited by wow65; 03-20-11 at 04:51 AM. Reason: more info
  #8  
Old 03-20-11, 05:27 AM
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Apologies!!! Apologies!!!

I went back to shop and re-checked everything and (with my reading glasses on) found that I had read the dipstick incorrectly. It was about a pint over-full. I drained it down to the "full" mark and it is fine. Runs great!!!

Thanks, Cheese.
Without your help, I would not have thought about the over-fill issue.

Have a great day,
Will Walker
 
  #9  
Old 03-20-11, 06:43 PM
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Great! Glad to help.
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