Engine cooling and lubrication system Volkswagen Passat B4

Cooling system. general information
The engine uses a forced circulation liquid cooling system using an all-weather coolant. The cooling system includes a radiator, expansion tank, water pump, thermostat and...

Removal and installation of the water pump
To remove, drain the coolant from the cooling system. Disconnect the wire from the negative battery terminal. Remove generator. Disconnect hoses from coolant pump. Loosen the pump...

Disassembly and assembly of the water pump
To disassemble, remove the pump drive pulley. Unscrew the bolts securing the pump cover and remove it complete with the sleeve, shaft and impeller, disconnect the cover from the...

Lubrication system
The engine has a pressure lubrication system. created by a gear spur oil pump with a pressure reducing valve. The oil pump is driven by an intermediate shaft (pic. 2-153). Oil...

Removal and installation of the oil pump
To remove, drain the oil from the engine crankcase. Remove the engine protection tray. Remove oil sump. Loosen the bolts securing the oil pump to the cylinder block. Remove oil...

Dismantling, checking the technical condition and assembling the oil pump
To disassemble, unscrew the two bolts securing the oil pump cover to the housing. Separate the cover from the body. Remove drive shaft and oil pump drive gear. Wash the pump...

Checking the oil pressure in the lubrication system
Disconnect the wires from the engine oil pressure sensor, remove the sensor and screw in the control pressure gauge hose fitting instead. Start the engine and bring the operating...

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