Final answer:
Manufacturers recommend replacing the water pump but not the engine oil pump when changing a timing belt.
Explanation:
When replacing a timing belt, manufacturers usually recommend replacing the water pump along with the belt since both are critical components and replacing the pump during the belt change can save on labor costs later. On the other hand, they typically do not recommend replacing the engine oil pump as it does not need to be replaced when changing the timing belt. Front crankshaft seals and camshaft oil seals are also not usually part of the standard replacement procedure for a timing belt.
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