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VALVE SPRING INSPECTION

VALVE SPRING INSPECTION

SM1665865

id011000501400

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.

Except MX-5 (ND) VIN Serial No.300001-
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MX-5 (ND) VIN Serial No.300001-
bpe2ue00000207

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
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}

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
IN: 2.0 ° (1.6 mm {0.063 in})
EX: 2.0 ° (1.7 mm {0.067 in})