Mercury MerCruiser D2.8L D-Tronic Service Manual page 249

SERVICE MANUAL NUMBER 22
VALVE SPRINGS
1. Use a vernier caliper to measure the valve spring free height. Replace spring if less than
specified limit.
2. Measure the springs distortion. If the measured value exceeds the specified limit, the
valve spring must be replaced.
3. Use a spring tester to measure the valve spring height under tension. Replace spring
if less than specified limit.
Closed Valve
Open Valve
90-860074--1 FEBRUARY 2002
a
a - Free Standing Height Measurement: 44.65 mm (1.757 in.)
b - Distortion Measurement: Maximum 2 mm (.079 [5/64] in.)
a - Applied Pressure: 32-36 kg (71-79 lb)
b - Height Measurement: 38.60 mm (1.460 in.)
a - Applied Pressure: 92.5-96.2 kg (204-212 lb)
b - Height Measurement: 28.20 mm (1.110 in.)
b
a
b
a
b
ENGINE MECHANICAL
b
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