Library.

“An exhaust camshaft sprocket synchronizes camshaft rotation so that engine valves open and close at the correct times to expel burned gases from the engine.”

The statement accurately describes the exhaust camshaft sprocket’s role in engine timing. It helps keep the camshaft synchronized with the crankshaft so exhaust valves operate at the right points in the cycle, allowing burned gases to be expelled. The main caveat is that exact valve events depend on the full timing system and cam geometry, not the sprocket alone.

“In an internal combustion engine, the timing chain synchronizes the crankshaft and camshaft(s) so that piston motion is coordinated with the opening and closing of the intake and exhaust valves.”

The claim correctly states the timing chain’s core job. In chain-driven internal combustion engines, it mechanically synchronizes crankshaft and camshaft rotation so intake and exhaust valves open and close in coordination with piston movement. Electronic controls and variable valve timing may fine-tune that relationship, but they do not negate the chain’s basic synchronizing role.