Genuine Nissan Maxima Rocker Arm

Nissan Maxima Rocker Arm Parts Questions & Experts Answers

• Rocker-Valve
  13257-V5001
  Q: How do you remove and install valve covers while ensuring proper measurement and inspection of rocker arms and shafts on Nissan Maxima?

  A:

  To remove the valve covers, first loosen the rocker arm shaft retaining bolts gradually to avoid distorting the shaft, working from the ends toward the middle in two or three stages. Before removal, mark the rockers to identify their original locations, using markings such as Fl for Front Intake and FE for Front Exhaust. Remove the bolts and lift off the rocker arm shaft assemblies one at a time, laying them on a nearby workbench in the same arrangement as when installed, ensuring that the shafts with larger notches are positioned on the Intake Manifold side. Inspect the rocker arms and shafts for abnormal wear, pits, galling, score marks, and rough spots, avoiding attempts to restore rocker arms by grinding the pad surfaces. Measure the outside diameter of the rocker arm shaft at each journal and compare these measurements to the specified outside diameter. Measure the inside diameter of each rocker arm using an inside micrometer or dial caliper, subtracting the corresponding rocker arm shaft diameter to obtain the clearance, and compare the results to the specified bore diameter. Calculate the clearance between the rocker arm shaft and the rocker arm by subtracting the outside diameter of each shaft journal from the corresponding bore diameter, ensuring that all measurements fall within specified limits; if any do not, replace the rocker arms or shaft as necessary. For installation, reverse the removal procedure and tighten the rocker arm shaft retaining bolts in several steps, working from the ends toward the middle.