Cosworth YB Manual - Section Engine Cooling
PART A - Engine, Engine Management and Turbocharger
Waterpump and Thermostat Housing
The water pump has been carried over from the Sierra 2,0 Ltr. OHC engine.
Connected to the thermostat housing are the bleed hose for the cooling system and the coolant feed pipe to the turbocharger.
Thermostat nominal temperature rating: 88° C
Opening temperature: 88° ... 94° C
Thermostat Housing
1 = Bleed hose
2 = Connection for coolant feed pipe to turbocharger