Nissan 100NX N14 silhouetteN14

CYLINDER HEAD — Installation (Determine gasket grade)

EM-229spec table

CD engine. Cylinder head gasket grade selection with worked 4-cylinder example. Section tab marked 'CD'.

Continued from EM-228

Determine gasket grade

  1. 6
    Determine gasket grade.
    (1) Calculate average value of projections for all pistons.
    (2) Determine gasket thickness, referring to the chart.
    (3) If any one of the average values of each piston exceeds the average value (Max.) for piston projections by more than 0.05 mm (0.0020 in), select a one grade thicker gasket than that determined in step (2).
    Cylinder head gasket showing identification indentations (notches/holes) on its edge to denote grade. 'Indentations' label with leader line at top, with the number '3' shown near indentations indicating the grade-3 (three-indentation) example.
    SEM252D

Gasket grade selection chart (Unit: mm (in))

A
Average values for piston projectionsLess than 0.52 (0.0205)
Gasket thickness1.15 (0.0453)
Number of indentations1
B
Average values for piston projections0.52 - 0.57 (0.0205 - 0.0224)
Gasket thickness1.20 (0.0472)
Number of indentations2
C
Average values for piston projectionsMore than 0.57 (0.0224)
Gasket thickness1.25 (0.0492)
Number of indentations3

Example

Gasket grade selection worked example (Unit: mm (in))

1.
ItemMeasured value (M1 / M2)
Cylinder No. 1M1: 0.53 (0.0209) / M2: 0.56 (0.0220)
Cylinder No. 2M1: 0.59 (0.0232) / M2: 0.55 (0.0217)
Cylinder No. 3M1: 0.53 (0.0209) / M2: 0.58 (0.0228)
Cylinder No. 4M1: 0.58 (0.0228) / M2: 0.51 (0.0201)
Remarks
2.
ItemAverage value of each piston
Cylinder No. 10.545 (0.0215)
Cylinder No. 20.57 (0.0224)
Cylinder No. 30.555 (0.0219)
Cylinder No. 40.545 (0.0215)
Remarks
3.
ItemAverage value of all pistons
Cylinder No. 10.55375 (0.02180)
Cylinder No. 2
Cylinder No. 3
Cylinder No. 4
Remarks
4.
ItemRounded value
Cylinder No. 10.55 (0.0217)
Cylinder No. 2
Cylinder No. 3
Cylinder No. 4
Remarks
5.
ItemDetermined gasket thickness (Temporary)
Cylinder No. 11.20 (0.0472) (Grade B)
Cylinder No. 2
Cylinder No. 3
Cylinder No. 4
Remarks
6.
ItemX: Maximum piston projection of selected gasket ... 0.57 (0.0224) + 0.05 (0.0020) = 0.62 (0.0244); Y: Maximum of the average value of each piston = 0.57 (0.0224); Result: Y < X
Cylinder No. 1
Cylinder No. 2
Cylinder No. 3
Cylinder No. 4
Remarks*1
7.
ItemDetermined gasket thickness (Final)
Cylinder No. 11.20 (0.0472) (Grade B)
Cylinder No. 2
Cylinder No. 3
Cylinder No. 4
Remarks
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