3 published verifications about Internal Combustion Engine Internal Combustion Engine ×
“In an internal combustion engine, the exhaust camshaft sprocket is synchronized by the engine timing system to rotate the camshaft so the exhaust valves open and close to expel burned gases from the engine cylinder.”
The described function is accurate. In engines that use an exhaust camshaft sprocket, the timing system keeps it synchronized with the crankshaft so the camshaft rotates at the correct phase and the exhaust valves open and close to expel burned gases. The main caveat is architectural: not every internal combustion engine has a separate exhaust camshaft sprocket.
“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.
“An oil reservoir system is used to maintain zero valve clearance in an internal combustion engine valve train.”
The evidence shows that hydraulic valve-train components use an internal oil reservoir or chamber to keep valve lash at zero or near zero during operation. Technical sources consistently describe this as the operating principle of hydraulic lash adjusters or hydraulic tappets. The phrasing is somewhat simplified, but the underlying mechanism is accurately stated.