Author |
Message |
Odd
| Posted on Sunday, October 07, 2018 - 06:19 pm: |
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so my son has a sportster-hybrid buell xr1200.It had a bad valve guide seal and was blowing oil out the rear breather. I thought when the seal was gone the oil went down the cylinder? Can someone explain it to me? I did replace the seal and the problem went away |
Torquehd
| Posted on Sunday, October 07, 2018 - 06:53 pm: |
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I'm guessing some oil does get sucked into the cylinder. When the valve is closed, positive crankcase pressure would also force air/oil mist past the valve guides into the rocker boxes, where it would get vacated out the breather tubes. I think. |
Hootowl
| Posted on Sunday, October 07, 2018 - 07:15 pm: |
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That’s right. Combustion byproducts make their way past the bad seal, and exit the rocker box vent, carrying oil with them. |
Odd
| Posted on Sunday, October 07, 2018 - 08:34 pm: |
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Lots of oil! |
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