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Is timing chain part of internal engine system?

Yes, the timing chain is absolutely part of the internal engine system. Here's why:

* Location: It resides inside the engine block, specifically within the valve train system.

* Function: It's a critical component for coordinating the movement of the pistons and valves. The chain ensures that the intake and exhaust valves open and close at the precise moments relative to the piston's position. This timing is crucial for proper combustion and engine operation.

* Direct Impact: If the timing chain fails, the engine will likely experience severe problems, including:

* Loss of power

* Rough running

* Engine damage

In essence, the timing chain is a vital part of the engine's internal workings, ensuring proper and synchronized movement of its critical components.