MWM Acteon Workshop Manual page 97

The test is performed placing the springs on a special device and reading the closing force for two different deflections
according to the following table. The intake valves springs are single (only one spring) and exhaust valves springs are
double.
Intake valve spring and outer exhaust valve spring
Ø wire
Load (Kgf)
0,0
A 35.78 ± 18
B 47.53 ± 23
9.612.0.006.7160 - 05/04
3,50 mm
Length (mm)
71.50
38.47
27.65
Exhaust valve inner spring
Ø wire
Load (Kgf)
0,0
A 9.95 ± 6.6
B 15.24 ± 7.1
Special device for spring measurement.
Cylinder heads
2,50 mm
Length (mm)
54.59
36.25
26.50