How to Adjust the Timing Chain of Changan Eado?
3 Answers
The following are the steps for adjusting the timing chain of the Changan Eado: 1. Align the crankshaft according to the marks on the crankshaft timing pulley, generally requiring the No. 1 cylinder piston to be at the top dead center position; 2. Install the camshaft timing pulley and align the camshaft according to the marks. Only the camshaft gear has marks, while the other gears do not. First, rotate the engine to bring cylinders 1 and 6 to the top dead center. Then assemble all gears except the camshaft gear, and align the mark on the camshaft gear with the mark on the engine block. Next, rotate the engine to a position approximately 22 degrees before the top dead center, adjust the fuel injection pump to the state where the first cylinder just starts to inject fuel, tighten the screws, and align the dual camshafts to their respective positions; 3. Install the timing belt/chain properly.
I usually tinker with my car myself, and adjusting the timing chain is no small task. For the engine of the Changan Eado, you first need to remove the engine cover to expose the chain area of the camshaft and crankshaft. Locate the alignment marks on them, such as specific notches on the camshaft and the dot alignment position on the crankshaft pulley, then use a special locking tool to secure the camshaft position to prevent rotation. If the chain is loose, check if the tensioner has failed; if it's severely aged, just replace the chain directly. Alignment must be precise—being off by even a little can easily cause the pistons and valves to collide, leading to complete engine failure. I only attempt this because I have the right tools; beginners should never take the risk and are better off booking a professional shop or seeking help from an experienced mechanic. When doing it yourself, make sure to record each step in order, and when reassembling, pay attention to the sealant to avoid oil leaks. Finally, start the engine and test for smooth low-speed operation to confirm success. The whole process takes about two to three hours, but with careful attention, it can be done.
From a professional standpoint, I must emphasize the criticality of timing chain alignment. The engine design of the Changan Eado demands precise positioning; otherwise, chain misalignment can trigger a cascade of failures. The worst-case scenarios include piston-to-valve contact causing internal engine rupture, skyrocketing repair costs, or even requiring a full engine replacement. Standard procedures involve removing the timing cover, inspecting the camshaft gear markers, and aligning them with the crankshaft sprocket while ensuring the chain maintains proper tension. The cost of miscalculation is prohibitively high—it's strongly advised to entrust this task exclusively to authorized 4S shops or certified technicians. They utilize precision calibration tools to eliminate human error. Remember, timing chains typically last around 100,000 kilometers. Address aging symptoms like abnormal noises promptly—don't delay inspections. A healthy engine is foundational to safe driving; cutting corners here is unacceptable.
