That dreaded engine knock. It can be several things, but for most people, it is a definite sign of lifters that have gone bad.
Valve lifters are the units activated by the offset lobes of the camshaft as it turns and are integral to the engine’s timing. As the crankshaft turns the timing belt/chain or gears, which in turn give motion to the crankshaft(s), the lobes on those shafts push and release valve lifters, which are responsible for the opening and closing of the valves themselves.
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