My dowels broke on the rocker arm shaft and I'm in the process of replacing them. They were broken on the driver side of the engine. I removed the passenger side valve cover to check to check those dowels and under the valve cover on the passenger side looks all yellow like the oil is burnt on . any ideas what has caused this ? Driver side looks good but has broken dowels , passenger side the dowels are fine but rocker arms valve springs and everything else is all yellow with burnt oil ? I need to know if this is a sign of needed repair on the passenger side of the engine before I put it all back together