Nissan 13231-4W000 Lifter-Valve

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To remove the lifters, start by removing the valve cover and rocker arm shaft assemblies. Secure the lifters with rubber bands to prevent them from falling out of the guides. Remove the lifter guide assembly and then remove the lifters from the bores one at a time, keeping them in order. Avoid laying the lifters on their side or upside down to prevent air from becoming trapped inside.

Apply RTV sealant to the sealing surfaces of the No. 1 bearing cap(s) and install new O-rings on the secondary timing chain tensioner(s).

Remove the lifters and shims from the cylinder head, keeping the proper shim with each lifter.

Always inspect the camshafts and lifters thoroughly, and check the camshaft endplay.

Measure the outside diameter of each camshaft bearing journal and the inside diameter of the corresponding camshaft bearings using appropriate measuring tools. Record these measurements for comparison.

Disconnect the electrical connectors at the camshaft position sensors and remove the sensors.

The first step is to take off the valve cover and the rocker arm shaft assemblies.

Loosen the camshaft bearing caps in two or three steps, following the reverse order of the tightening sequence, while keeping the caps in order for reinstallation.

Subtract the outside diameter of each lifter from the inside diameter of the lifter bore and compare the difference to the clearance specified in this Chapter. If both the lifter and the bore are within acceptable limits, this measurement should fall within tolerance. However, if new parts such as lifters or the lifter guide assembly (SOHC) or the cylinder head (DOHC) have been changed, this clearance may no longer fall within the specified limit.