Nissan 240SX’89 Cylinder Head Inspection and Cleaning
Clean the 1989 Nissan 240SX Cylinder Head and valve components using approved cleaning methods. Inspect cylinder head for cracks, damage or wrapped gasket surface. Place straightedge across gasket surface. Determine clearance at center straightedge. Measure across bot diagonals, longitudinal centerline and across the head at several points. See below picture.
On cast cylinder heads, if warpage exceeds .003″ (.08mm) in a 6″ span, or .006″ (.15mm) over total length, cylinder head must be resurfaced. On most aluminum cylinder heads, if warpage exceeds .002″ (.05mm) in any area, cylinder head must be resurfaced. Warpage specification may vary with manufacturer.
Cylinder head thickness should be measured to determine amount of material which can be removed before placement is required. Cylinder head thickness must not be less then manufacturer’s specifications. If cylinder head required surfacing, it may not align properly with intake manifold. On “V” type engines, misalignment is corrected by machining intake manifold surface that contacts cylinder head. Cylinder head may be machined on surface that contacts intake manifold.
Using oil stone, remove burrs or scratches from all sealing surface.
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