How to align the timing chain of Changan 473 engine?
2 Answers
Align the crankshaft according to the mark on the crankshaft timing pulley, generally requiring the No. 1 cylinder piston to be at the top dead center position; align the two camshafts separately for the dual camshafts. The timing chain of the Changan Star belongs to the engine cover and bracket category. The timing chain replaces the timing belt, but their principles are the same—one is on the outside, and the other is on the inside of the machine, both connecting the camshaft and the crankshaft for coordinated movement. The following are the precursors of timing chain failure: 1. Abnormal noise: During driving, listen to the engine sound. If there are occasional "clicking" friction sounds or a noticeable change compared to the usual sound, it indicates a timing chain failure, and it is recommended to check and replace it promptly. 2. Increased fuel consumption: After driving a certain mileage, the car may experience varying degrees of increased fuel consumption, which may be caused by timing chain failure. 3. Decreased power output: The phenomenon of decreased power output in the car is largely caused by the engine and related component configurations. Once the timing chain fails, it will restrict the movement of the cylinders, affecting the air intake and exhaust functions.
I've worked in an auto repair shop for over a decade and am very familiar with timing chains. The key to aligning the Chang'an 473 engine is finding the correct marks. First, remove the engine cover and ensure the crankshaft is at top dead center (TDC), typically aligned with the zero-degree mark. Then align the camshaft marks with the points on the sprocket. It's best to use professional tools like a chain tensioner and alignment pins to secure the chain and prevent slippage. Misalignment can cause engine knocking, starting difficulties, or even complete failure. I recommend consulting the manual first, as mark positions vary by model. Always prioritize safety by disconnecting the battery and letting the engine cool before working. Regular chain wear inspection is crucial—excessive wear leads to excessive play and alignment issues, which replacing the chain can resolve. Don't neglect chain lubrication during routine maintenance to extend its life and reduce repairs. Follow these steps carefully to ensure success on the first try.
