How to align the timing chain on a Mazda6 2.0 engine?
3 Answers
Remove the right half shaft. There is a timing inspection hole on the side of the engine block. Note that at this point it is slightly before reaching top dead center. There is a timing hole. Use an M6 bolt to screw it upwards onto the front timing rail cover. Install one upper bolt. The final step requires fixing both camshafts in place first.
I previously aligned the timing chain on my Mazda6 2.0 by myself, and the procedure was quite meticulous. First, rotate the crankshaft to the top dead center position of cylinder one, locate the groove mark on the crankshaft pulley, and align it with the 0 mark on the front engine cover. Then, remove the valve cover—at this point, the two small dot marks on the rear of the camshafts should face upward. There are two golden chain links on the timing chain that need to align with the notch marks on the camshaft gears: one for the exhaust camshaft and one for the intake camshaft. When installing the chain, be extra careful not to twist it; make sure it’s fully seated in the gear grooves before tightening the bolts. Finally, install the hydraulic tensioner, manually rotate the crankshaft two full turns, and recheck the alignment marks to ensure no skipped teeth. The whole process requires a ratchet wrench and specialized timing tools—beginners attempting this for the first time should have an experienced mechanic supervise.
Last time when helping a friend with a major overhaul of the Mazda6 2.0 engine, special attention was paid to the timing chain. First, rotate the crankshaft to the top dead center position, aligning it with the mark on the front engine cover. Check the positioning pin at the back of the camshaft to ensure the notch marks on both camshafts are facing directly upward. Locate the two specific golden links on the chain, aligning them with the triangular marks on the intake and exhaust camshaft sides. It's recommended to use a magnet to hold the chain in place during alignment to prevent shifting. Finally, install the chain guide and hydraulic tensioner. Manually rotate the engine a few turns and use a marker to redraw the alignment marks, as the chain may stretch by one or two tooth positions over time. Remember to apply sealant before reinstalling the timing cover. The engine compartment of this car is narrow, so be careful not to damage the wiring during operation.
