The first step in servicing and repairing a radiator cooling fan on a gas engine is to disconnect the negative
Battery Cable. Take the coolant reserve from the fan shroud without removing the hoses or emptying the cooling fluid. To remove the thermal viscous fan drive/
Fan Blade, counterclockwise rotate the rice on the mounting nut with a 36 Mm Fan Wrench. It is important not to remove either the fan/viscous fan drive assembly or the fan blade assembly at this part of the process. Then, remove the fan shroud mounting bolts and slide the lower shroud supports off the hooks on the radiator tank. This will let you take out the fan shroud and fan blade/viscous fan drive as one whole assembly. Never put the viscous fan in a horizontal position because the silicone can mix with the lubricant. Open the four bolts that hold the fan blade assembly to the viscous drive and remember that if your engine has a reverse rotating fan marked with Reverse, be careful not to install it the wrong way, because this could result in the engine overheating. Combine soap and water and clean the fan blades without using anything abrasive. After changing the fan blade assembly due to mechanical wear, inspect the
Water Pump and viscous fan drive for signs of excess vibration damage. For the first step in installation, secure the fan blade assembly to the viscous fan drive and tighten the bolts to 18 ft. lbs. (24 Nm). As one unit, fit the fan shroud and blade/viscous fan drive and then fasten the shroud to the intake housing. Put the fan blade or viscous fan drive onto the water pump shaft and attach it with the tightening nut until you reach 50 Nm (37 ft. lbs.). Replace the coolant reserve/overflow container and then secure the negative battery cable again. Once you've installed the viscous fan drive, bring the engine speed to 2000 rpm and maintain it for about two minutes so the oil covers all areas in the drive.