1999 Volvo Penta "WT" Models Workshop Manual, Page 344Get this manual
4.3 Gi Models Only
1Disconnect the small water by-pass hose at the top of thermostat housing2Disconnect the water discharge hose at the port side exhaust elbow nippleLower to the rear of the blockBlow outthe water trapped in the vapor separator and lines by applying air to the by-pass hose
All 4.3 Models
1Remove the long water supply hose at the thermostat housing Lower it alongside block and drain it completely2Disconnect and drain the large hose at the water pump
3Remove intake manifold drain plug and drain manifoldThe bow of the boat may have to be lowered to ensure complete drainageReinstall the plug when draining is complete
rn []] 4Remove drain plugs from the plugsofthe port port rear and starboard exhaust manifoldsRemove drain on the