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Why is it that the failure of the tensioner is most likely to occur when the engine is started?
Because the tensioner of the engine is running on the tensioner by the oil pressure of the system, the check function of the tensioner only limits the plunger back when the engine oil pressure is lost after the engine is turned off. (Return will not exceed one tooth position)! The engine has not yet established pressure at the moment of starting the engine, and the chain relies on the ratchet function of the tensioner to withstand the tension of the chain.
Note that the engine's 16 valve springs have a large impact on the chain through the camshaft during low-speed starting (the engine speed is high after starting, the sprocket has inertia and the elasticity is small, and the engine is repaired. It is clear that this impact force must be borne by the ratchet of the tensioner, and the ratchet is not loaded until the oil pressure is established.
