S&S 113 Oil coming out of Carb breather

[BRad384]

I have a 21-year-old custom with an S&S 113 motor. For the first time, it started spitting oil out of the carb on a ride yesterday. Motor runs strong. Changed the oil fairly recently - on the 4th ride after the oil change, I don't think it is the oil level. Ordered a compression testing tool - check for warn rings. Thinking more old breather hoses/setup/debris. Apprecaite any thoughts where to look.

 

[Mickmorris]

I have a 21-year-old custom with an S&S 113 motor. For the first time, it started spitting oil out of the carb on a ride yesterday. Motor runs strong. Changed the oil fairly recently - on the 4th ride after the oil change, I don't think it is the oil level. Ordered a compression testing tool - check for warn rings. Thinking more old breather hoses/setup/debris. Apprecaite any thoughts where to look. View attachment 136308

Have a vent on your crankcase?

 

[BRad384]

Yessir

 

[Mr. Wright]

This comes straight from S&S. Being that you are running an air cleaner with vents in the heads, you can plug off the crank case vent.

 

[john sachs]

1-Vent HEADS to a catch can. 2- block off stand offs (cap) on the intake manifold, and air cleaner. 3- And vent from the rear of the engine case, by removing 1 of the plugs. Install a hose barb and hose.

 

[BRad384]

Thank you, John. I will try this - much appreciated.

 

[Mickmorris]

Thank you, John. I will try this - much appreciated.

I believe your oil pump has a check valve. It may be stuck and letting more oil than normal into the crankcase when sitting idle. This would probably push some out the head breathers until it warmed and cycled back to the tank. If you have a vent on the crankcase I think you would probably see some blow-by there too. Johns suggestion of venting heads to a catch can is the complete fix. But why did it just suddenly start is still a question that needs to be answered. I like your idea of compression test on the rings to start for sure. Keep us posted!

 

[BRad384]

I believe your oil pump has a check valve. It may be stuck and letting more oil than normal into the crankcase when sitting idle. This would probably push some out the head breathers until it warmed and cycled back to the tank. If you have a vent on the crankcase I think you would probably see some blow-by there too. Johns suggestion of venting heads to a catch can is the complete fix. But why did it just suddenly start is still a question that needs to be answered. I like your idea of compression test on the rings to start for sure. Keep us posted!

Thanks much. I am also wondering if the umbrella valves are no longer pliable due to age and not seating, allowing oil to pass by.

Will report back. Just joined today, seeking feedback - greatly appreciated!

 

[Mickmorris]

Thanks much. I am also wondering if the umbrella valves are no longer pliable due to age and not seating, allowing oil to pass by.

Will report back. Just joined today, seeking feedback - greatly appreciated!

Welcome from the Space Coast of Florida!

 

[Snuffy]

Welcome from Tennessee