Here are some pictures of my tractor's Continental Z-145 engine with the valve cover removed.
Note the last picture, which shows one of the spring retainers/washers at each end of the rocker arm assembly that are held in place by cotter pins. As it turns out, both cotter pins had failed, allowing the washers to come off the end of the shaft. The resting place of one of the washers is visible in the first picture, and the other one was found stuck to the valve cover.
Fortunately, there appears to have been no damage caused by the loose washers, and I'm not concerned about the missing cotter pins which are either laying at the bottom of the oil pan or were sucked into the oil filter long ago.
Note the last picture, which shows one of the spring retainers/washers at each end of the rocker arm assembly that are held in place by cotter pins. As it turns out, both cotter pins had failed, allowing the washers to come off the end of the shaft. The resting place of one of the washers is visible in the first picture, and the other one was found stuck to the valve cover.
Fortunately, there appears to have been no damage caused by the loose washers, and I'm not concerned about the missing cotter pins which are either laying at the bottom of the oil pan or were sucked into the oil filter long ago.
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