bx2660 started blowing oil under the hood.

North Idaho Wolfman

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L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
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Sandpoint, ID
It's supposed to have a rubber plug in it.

Oil gauge plug.
1G513-36550

When you get a new plug and install it, if it tries to pop the plug out again or the dip stick, then the valve cover breather is not working right. ;)