Nissan 13202-8J110 Valve-Exhaust

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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.

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.

It may be possible to move a shim that needs to be removed to another valve lifter requiring that size, reducing the number of new shims needed.

Remove the camshafts to access the lifters, mark those to be replaced, and record which valve they came from.

After the valve job has been performed, the cylinder head will be in like-new condition. Before installation on the engine, it is important to clean the cylinder head again to remove any metal particles and abrasive grit that may still be present from the valve service or cylinder head resurfacing operations. Using compressed air, if available, is recommended to blow out all the oil holes and passages.