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Tappets (lifters)
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| What happened: |
The tappet slides along the rotating lobe of a camshaft to open and close the valves. As shown in the photos below, the tappet removed from engine B and more wear than the tappet removed from engine A. |
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| Why did it happen: |
The contact between the tappet and the camshaft is the most heavily loaded component in the engine. Based on our inspection, the motor oil in engine B did not provide the same level protection as the motor oil in engine A. This was also evident based on inspection of the camshafts. |
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| Why is this important: |
Similar to the camshaft, mild tappet wear will cause the valve to not open as far as it should resulting in a loss of torque. More severe wear to the tappet will cause a significant loss in torque and may cause the engine to misfire. |
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| Vehicle application: |
This is equally important for automotive, truck and racing. The camshaft controls the opening and closing of the valves in each cylinder. For an engine to operate efficiently and at its maximum performance, the valves must be able to open and close at the appropriate time. |
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