Warning. Do not remove the radiator cap when the engine is hot, as escaping vapors can cause severe burns. Close the radiator cap with a thick rag and slowly unscrew the cap until the escaping steam hisses. After the steam stops escaping, slowly unscrew and remove the cap from the radiator.
Removing
- Disconnect the wire from the negative battery terminal.
- Drain the coolant from the cooling system.
- Remove the timing belt drive timing.
- Remove idler toothed belt pulley.
- Turn out bolts and remove a back casing of a gear belt (pic. 5.15).
- Turn out bolts and remove the water pump.
Pic. 5.15. 4G9 engine water pump: 1-rear casing of a gear belt; 2 - water pump
Examination
- Check each part for cracks, damage or wear and replace the pump as an assembly if necessary.
- Rotate the water pump shaft and check for smooth rotation and no noise.
- Check for coolant leaks from the pump. If there is a leak, the pump seal is faulty. If necessary, replace the water pump.
Installation
- Installation is carried out in the reverse order of removal, taking into account the following.
- Clean the mating surfaces of the water pump and cylinder block.
- Apply a layer of sealant to the mating surface of the water pump (pic. 5.16).
Sealant: Mitsubishi Genuine Part No. MD970389
Pic. 5.16. Places for applying sealant to the mating surface of the water pump
- Install the water pump and secure with bolts, tightening them to the required torque.
Tightening torque: 24 Nm
- Install the rear toothed belt cover and secure with bolts, tightening them to the required torque.
Tightening torque: 10-12 Nm
- Install idler toothed belt pulley.
- Install the timing belt drive of the gas distribution mechanism.
- Fill the cooling system with the required amount of the required coolant.
- Connect the wire to the negative battery terminal.
- Start the engine and check for leaks from the cooling system.
- Check coolant level.