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Just inherited a 1989 Bolens ST-120. I was told the crank case seal has been replaced in the past and apparently has blown again as it is leaking oil out of the bottom of the engine. I would think that it would blow due to crank case pressure but I am at a loss as to what could be causing that...

Engine: KT735 I found the valve cover online but the parts diagram shows an gasket/o-ring but does not list a part that is able to be selected. The official manual parts diagram doesn't show it so I'm confused on if I can just replace the valve cover (with new bolts) or if I need to find the...