Mercury 6 SERIES

CYLINDER HEAD
Page 4A-20 90-857138R1 MAY 2000
Valve Springs
1. Check each spring under load on a spring tester. Replace any weak springs.
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Valve Spring Compressed Pressure (Installed)
Closed Height 0.965 in. (24.4 mm)
4/5 (1999 & 2000)
6 (2000)
4/5/6 (2001 & Newer)
Open Height 0.709 in. (17.4 mm)
4/5 (1999 & 2000)
6 (2000)
4/5/6 (2001 & Newer)
17 lbf. (7.7 kgf)
24 lbf. (10.8 kgf)
24 lbf. (10.8 kgf)
31 lbf. (14.0 kgf)
39.4 lbf. (17.9 kgf)
39.4 lbf. (17.9 kgf)
2. Check free length limit of each spring. Replace if out of specification.
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Valve Spring Free Length Limit
4/5 (1999 & 2000)
6 (2000)
4/5/6 (2001 & Newer)
1.260 in. (32.0mm)
1.378 (35.0mm)
1.378 (35.0mm)
3. Check each spring on a flat surface using a square. Rotate spring and check space be-
tween the top coil and square. Replace if out of specification.
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