Nissan 13202-8J110 Exhaust Valve

The manufacturer recommends adjusting the valve clearance at the specified interval only if the valve train is making excessive noise. Begin by disconnecting the cable from the negative terminal of the battery. Next, remove the valve cover. For manual transmission vehicles, set the parking brake and place the transmission in neutral; for automatic models, place it in Park. Remove the spark plugs and position the number 1 piston at TDC on the compression stroke, aligning the timing marks. Measure the clearance of the indicated valves with a feeler gauge when the piston is at TDC on the compression stroke, ensuring to feel a slight drag on the gauge if the clearance is correct. Record each measurement and compare with the desired valve clearance specifications, noting any that are out of specification for later reference regarding required replacement lifters. Turn the crankshaft 240 degrees clockwise and measure the clearances of the indicated valves, then turn it an additional 240 degrees clockwise and measure again. The V6 engine does not use valve adjusting shims; if a lifter is out of specification for clearance, it must be replaced with a new lifter of a different thickness. Mark the lifters to be replaced and record their corresponding valves, using a micrometer to measure the thickness of each lifter precisely at the center. To calculate the correct thickness for a replacement lifter that will achieve the desired valve clearance, use the provided formulas for both intake and exhaust sides. New lifters are available in 27 standard thicknesses, ranging from 0.3102 inch to 0.3291 inch, and are marked on the underside for size identification. Mark the new lifters for their installation locations, lubricate them with engine assembly lube, and install them. After replacing the lifters, reinstall the camshafts, and complete the installation in reverse order of removal.

According to the manufacturer the valve clearance should be checked and altered at the given interval only if the valve train is noisy. To start the process, remove the cable far away from the connection point of its negative terminal on the battery. Next, you have to take out the valve covers and spark plugs. Place the number 1 piston at TDC on the compression stroke and the timing marks as well. Check the clearance of the indicated valves with feeler gauge, and record the clearance, and check with standard valve clearance if which one is out of order for later repair. Rotate the crankshaft 240 degrees and then with the help of the feeler gauge read and tabulate the indicated valve clearances. Turn the crankshaft another 240 degrees and do the same for the rest of the valves. These engines do not employ valve adjusting shims, if some clearance is out of tolerance, the lifter must be replaced with a new lifter of different dimension to get the correct value. Take off the camshafts to gain access to the lifters; place a 'X' mark on those that you want to change and document which valve they belonged to. Using micrometer, take measurements on the thickness of the center of the lifter. To calculate the correct thickness of a replacement lifter that will place the valve clearance within the specified value, use the formula: N = T + A-V that represents the appropriate thickness of the new lifter, T as the thickness of the previous worn out lifter, A as the amount of valve clearance that was measured, and V as the ideal thickness of the valve clearance. Choose a lifter of an approximate thickness of the calculated valve clearance; lifters are stamped with their size on the bottom side. Identify and flag the new lifters for the particular lifters that are to be installed in your car's engine then apply engine assembly lube all over them then you install them. Once the lifters are changed, place the camshaft(s) back. The rest of the process is the opposite of the removal process; reattaching all the connections, including the battery, followed by the re-learn processes.

Servicing valves, valve seats and valve guides often referred to as a valve job must be done by a professional due to the complexity of the process and use of specialised tools. On the other hand, the heads can be removed and disassembled by a home mechanic, who will then carry out an initial cleaning and inspection before reassembling and taking them to an automotive machine shop for further work. Therefore, this examination helps determine how fit the cylinder head and valve train components are as well as what kind of repairs and new parts are necessary when one goes to an auto machine shop. The valves and springs will then be removed by the machine shop while at it they will work on the valves or replace those that are worn out or pitted, replace the valve guides that could have gone bad, check out on the spring retainers, valve stem keepers, and even replace some of these parts like the valve seals with new ones; finally they should fix all these back together making sure that proper installed spring height is achieved. Also if warped, the cylinder head gasket surface will be re-surfaced. Consequently, after being serviced through a professional valve job thereby leaving it almost like new in condition. Upon returning, it should also be washed again so that all metal particles or abrasive grit can be removed from it which may still remain from a recent cylinder head resurfacing or any valve service operation. Finally if possible blow air through all oil holes and passages using compressed air.

Place the special valve lifter tools in position, depress the valve lifter, and install the new adjusting shim, measuring the clearance with a feeler gauge to ensure accuracy.