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Camshaft bores should be align bored or honed when they are found to be out of round by more than 0.0015-inch. This condition indicates that there is excessive wear or misalignment that can adversely affect the performance and longevity of the engine. Proper alignment ensures that the camshaft rotates smoothly without binding or excessive friction, which can lead to increased wear on both the camshaft and the associated components like the bearings.
When camshaft bores are out of round, it can cause incorrect timing of valve actuation, which may result in poor engine performance, increased emissions, and potential engine damage. Therefore, measuring the roundness and proper alignment is crucial during engine rebuilds or significant component replacements. If the measurement exceeds that specified limit, align boring or honing is the appropriate corrective action to restore proper function and ensure reliability in operation.
The other options do not present the appropriate conditions for when aligning is necessary. For instance, replacing valve springs, initial assembly, or routine oil changes do not inherently induce problems with camshaft bore alignment. It is specifically the measurement of out-of-round conditions that dictates the need for this service.