Method for Adjusting the Valves of the Teana?
4 Answers
Here is the method for adjusting the valves of the Teana: 1. Remove the cylinder head covers of the first, second, and third cylinders. Rotate the crankshaft to position each cylinder at top dead center, aligning the groove on the crankshaft pulley with the 0 mark on the first timing belt cover; 2. Check whether the timing marks on the two camshaft timing belt pulleys align with the timing marks on the fourth timing belt cover. If not aligned, rotate the crankshaft 360 degrees. Tighten the bearing cap fastening bolts appropriately in several steps to 19.6 N·m; 3. Inspect the intake valves of the first and fourth cylinders and the exhaust valve of the fifth cylinder. Then rotate the crankshaft 240 degrees and check the exhaust valves of the second and fourth cylinders and the intake valve of the sixth cylinder. Record all measured data exceeding the specified values and identify the valve numbers requiring adjustment of the clearance; 4. Remove the adjustment shims of all valves that need adjustment. To facilitate removal, it is best to position the cam lobes upward and use specialized tools; 5. Measure the thickness of the adjustment shims using a 0–25 mm outside micrometer. Calculate the thickness of the new shims to ensure the valve clearance meets the specified value.
I've been repairing Nissan cars for over a decade, and the valve adjustment for the Teana depends on the situation. The newer models all have hydraulic lifters for automatic adjustment, so manual adjustment isn't necessary at all. For older Teana models or after an engine overhaul, manual adjustment is required, and the steps are quite meticulous: First, remove the valve cover, locate the camshaft position, and measure the clearance with a feeler gauge. Typically, the hot engine clearance is around 0.2 mm, and the cold engine clearance is 0.25 mm, but the exact figures should be checked in the repair manual. During adjustment, the crankshaft position must be aligned correctly; otherwise, the clearance won't be accurate. After adjustment, it's recommended to start the engine and listen for any noise—if there's still a ticking sound, it means the adjustment isn't right. The key point is that each adjustment takes two to three hours, and without experience, it's really not manageable. It's best to take it directly to a repair shop.
I run an auto repair shop, and it's quite common for Teana owners to ask about valve adjustments. First, confirm if the engine has hydraulic lifters, as most newer Nissan models don't require adjustment. If manual adjustment is needed, start by removing the ignition coils and valve cover. Use a special tool to rotate the crankshaft to top dead center. Measure the clearance with a feeler gauge – if it's too large, replace the adjustment shim; if too thin, add a shim. The most troublesome part is timing the dual camshafts on V6 engines twice. After adjustment, remember to tighten the bolts with a torque wrench, and I recommend replacing the valve cover gasket as well. The whole process is best done with two people working together. Charging 300 yuan at my shop is reasonable, as DIY attempts can easily lead to valve collision and more trouble.
As a DIY car enthusiast, I've adjusted the valves on my 2006 Teana. The tools needed include a feeler gauge, torque wrench, and socket set. First, let the engine cool completely, then remove the decorative cover and ignition coils. Rotate the crankshaft until the camshaft lobe of the first cylinder faces outward, and measure each clearance with a 0.25 feeler gauge. When reassembling, be careful not to apply too much sealant as it may clog the oil passages. But honestly, newer models with CVTC systems don't require adjustment since the hydraulic lifters automatically compensate. Regular oil changes during maintenance are more important - dirty oil is the main cause of valve noise.
