1999 Volvo Penta "WT" Models Workshop Manual, Page 168Get this manual
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Engine Specifications VALVE SYSTEM
Spring Pressure
ClosedOpen 7684 lbat 1.70 in(338374 at 43 mm) 832187203 lbat 1.27 in(903 at 32 mm)
Valve lift
Intake Exhaust 0.