VALVE SPRING INSPECTION

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Caution
•  The valve springs differ depending on the IN and EX sides.Therefore, verify the free length or identification paint beforehand and inspect the valve springs.

SKYACTIV-G 1.3, SKYACTIV-G 1.5 (Except MX-5 (ND))

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SKYACTIV-G 1.5 (MX-5 (ND))

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SKYACTIV-G 2.0 Except MX-5 (ND) VIN Serial No.300001-

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SKYACTIV-G 2.0 MX-5 (ND) VIN Serial No.300001-

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SKYACTIV-G 2.5

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1.  Measure the valve spring height using the spring tester.

•  If it is not within the specification, replace the valve spring.
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Valve spring installation height [SKYACTIV-G 1.3]
IN: When pressurized with spring force of 161—179 N {16.5—18.2 kgf, 36.2—40.2 lbf}, spring height is 34.0 mm {1.34 in}
EX: When pressurized with spring force of 209—231 N {21.4—23.5 kgf, 47.0—51.9 lbf}, spring height is 34.0 mm {1.34 in}
Valve spring installation height [SKYACTIV-G 1.5] (Except MX-5 (ND))
IN: When pressurized with spring force of 161—179 N {16.5—18.2 kgf, 36.2—40.2 lbf}, spring height is 34.0 mm {1.34 in}
EX: When pressurized with spring force of 209—231 N {21.4—23.5 kgf, 47.0—51.9 lbf}, spring height is 34.0 mm {1.34 in}
Valve spring installation height [SKYACTIV-G 1.5] (MX-5 (ND))
IN: When pressurized with spring force of 161—179 N {16.5—18.2 kgf, 36.2—40.2 lbf}, spring height is 34.0 mm {1.34 in}
EX: When pressurized with spring force of 228—252 N {23.3—25.6 kgf, 51.3—56.6 lbf}, spring height is 34.0 mm {1.34 in}
Valve spring installation height [SKYACTIV-G 2.0]
IN: When pressurized with spring force of 190—210 N {19.4—21.4 kgf, 42.8—47.2 lbf}, spring height is 38.0 mm {1.50 in}
EX: When pressurized with spring force of 228—252 N {23.3—25.6 kgf, 51.3—56.6 lbf}, spring height is 38.0 mm {1.50 in}
Valve spring installation height [SKYACTIV-G 2.5, type A]
When pressurized with spring force of 228—252 N {23.3—25.6 kgf, 51.3—56.6 lbf}, spring height is 38.0 mm {1.50 in}
Valve spring installation height [SKYACTIV-G 2.5, type B]
IN: When pressurized with spring force of 195—215 N {19.9—21.9 kgf, 43.9—48.3 lbf}, spring height is 38.0 mm {1.50 in}
EX: When pressurized with spring force of 228—252 N {23.3—25.6 kgf, 51.3—56.6 lbf}, spring height is 38.0 mm {1.50 in}

2.  Measure the amount of off-square on the valve spring using a square.

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(1)  Rotate the valve spring one full turn and measure A at the point where the gap is the largest.
•  If it exceeds the maximum specification, replace the valve spring.
Maximum valve spring off-square [SKYACTIV-G 1.3, SKYACTIV-G 1.5]
IN: 2.0 ° (3.3 mm {0.1299 in})
EX: 2.0 ° (3.4 mm {0.1339 in})
Maximum valve spring off-square [SKYACTIV-G 2.0]
IN: 2.0 ° (3.5 mm {0.1378 in})
EX: 2.0 ° (3.6 mm {0.1417 in})
Maximum valve spring off-square [SKYACTIV-G 2.5]
IN: 2.0 ° (3.6 mm {0.1417 in})
EX: 2.0 ° (3.6 mm {0.1417 in})