OEM Toyota MR2 Spyder Thermostat

Toyota MR2 Spyder Thermostat Parts Questions & Experts Answers

• Water Inlet
  90916-A3003
  Q: How to service the thermostat on Toyota MR2 Spyder?

  A: The service procedure for the thermostat requires the engine coolant drainage followed by Drive Belt generator removal and front engine under cover disassembly. You must detach the water inlet from the cylinder block by taking out both nuts before extracting the thermostat while taking out its gasket. The thermostat requires inspection through water submersion while raising temperature until the valve opens at 80 to 84 degrees Celsius between 176 to 183.2 degrees Fahrenheit then replace the part if the opening temperature does not meet the specification. Test the valve lift's opening by checking if it exceeds 10 mm (0.39 inch) at 90 degrees Celsius (194 degrees Fahrenheit) and at the same time verify complete valve closure below 40 degrees Celsius (104 degrees Fahrenheit). If any criterion fails, replace the valve immediately. Place the thermostat inside the cylinder block using a new gasket while maintaining the jiggle valve in an upward position within a 10 degrees range and either side of the specified positioning. Begin by tightening the water inlet with two nuts according to 9 Nm of torque which equates to 92 kgf-cm or 80 inch lbs. After that re-attach the front engine under cover with the generator and drive belt. To complete the operation you should fill the system with engine coolant then start the engine to check for leaks followed by another inspection of the engine coolant amount.