1999 Volvo Penta "WT" Models Workshop Manual, Page 178Get this manual
Intake Manifold Removal
1Drain coolant from manifolds and both sides of
2Disconnect:
aBattery cables from batterybCoolant hoses at thermostat housingcThrottle cable from throttle body and anchor block
dCrankcase ventilation hose and PCV Valve from rocker
arm covers (both sides),