Alfa Romeo 159 Training Material page 69

ENGINE
1. Thermostat housing
2. Thermostat
3. Thermostat cover
4. Pipe
5. O-ring (pipe)
6. Coolant pump
7. O-ring (pump)
8. Pump draining nut
9. Coolant temperature sensor
The thermostat unit is connected to the crankcase with screws. The temperature sensor is fastened to the unit with a
threaded connection.
Oil-water heat exchanger
1. Engine oil thermostat
2. Oil filter adapter housing
3. Engine oil cooler
4. Oil filter housing
FUNCTION: Effective oil cooling is needed to maintain the chemical, physical and viscous properties of oil. This
function is ensured by a water-oil heat exchanger.
MATERIAL: The heat exchanger consists of a pack of aluminium plates crossed on one side by a flow of coolant and
on the other by a flow of engine oil.
LOCATION: The heat exchanger is fastened to the cylinder block on flywheel side, on the upper part.
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