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Interesting type of engine failure...


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Have been slowly dismantling a $100 parts wagon and got to the engine yesterday. Pulled a valve cover off and right away noticed 1 missing rocker arm and the corresponding exhaust valve spring at a noticeably lower height than the other three. When I pulled the head, found that the exhaust valve was held open by a dislodged concentric disc insert that surrounds the valve stem. This disc is of slightly larger diameter than the exhaust valve itself (not a stem seal?). Found the missing rocker arm lodged in one of the coolant chambers. From the looks of the piston chamber, the previous owner must have been running on 3 cylinders for awhile. :eek:

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