Question 1

How to remove the water pump on Toyota 4Runner?

Accepted Answer

The process of removing the water pump starts with removing the No. 1 engine under cover sub-assembly by discharging the 4 bolts. You should drain all coolant from the engine before you take out the V-bank cover. The removal of the radiator support seal upper begins with unclipping 11 fixtures. Stepping down the fan with fluid coupling requires a step that starts with unboltting its four fluid coupling fasteners. The procedure begins by removing the V belt from the fan and generator before loosening the hose clamp which allows detachment of the oil cooler hoses from the fan shroud and unfastening the radiator reserve tank hose. All this leads to removal of the 2 fan shroud bolts and radiator reserve tank bolt. Proceed by undocking the fan coupled with fluid coupling and fan shroud through 4 fluid coupling nut removal and ultimately take out the fan pulley. Detach ventilation hose No. 2 before taking off the air cleaner assembly. The water inlet removal process requires disconnecting 2 oil cooler hoses and 2 radiator hoses and 5 water by-pass hoses before removing the 5 water inlet bolts together with the O-ring from the water outlet pipe and gasket from the water pump. The procedure for removing the No. 2 idler pulley assembly always applies to both No. 2 idler pulleys before removing potential additional components of bolt and the No. 2 idler pulley cover plate and idler pulley and cover plate. The motorist should start by removing the generator assembly then proceed to separate the cooler compressor assembly and remove the V-ribbed belt tensioner assembly. After removing the 17 bolts, you should take out the water pump assembly in conjunction with its gasket.

Question 2

How to install the water pump assembly and related components on Toyota 4Runner?

Accepted Answer

The installation begins with placing a new gasket before installing the water pump using 17 bolts torqued to 9.0 Nm (92 kgf-cm, 80 in-lbf) for 10 mm (0.39 in.) head bolts and 23 Nm (235 kgf-cm, 17 ft-lbf) for 12 mm (0.47 in.) head bolts. The V-ribbed belt tensioner assembly and cooler compressor assembly and generator assembly must be installed second. Users must tighten all components of the No. 2 idler pulley sub-assembly to 54 Nm (551 kgf-cm, 40 ft-lbf) using the idler pulley cover plate (PU107013ARMXY3) while they need to replace the No. 2 idler pulley with a new "PU107013ARMXY3" marked unit if required. The installation sequence requires attaching the idler pulley together with the No. 2 idler pulley cover plate but excluding the use of cover plate PU107013ARMXY1. Begin assembly of the water inlet system by applying a new O-ring to the water outlet pipe and a new gasket to the water pump before lubricating the O-ring with soapy water and fastening the water inlet with 5 bolts at 9.0 Nm (92 kgf-cm, 80 in-lbf) torque while also installing the 5 water by-pass hoses together with 2 radiator hoses and 2 oil cooler hoses (in this context only). Proceed with installation of these parts by first setting the fan pulley onto the water pump and then building the fan with fluid coupling and fan shroud followed by a temporary installation of 4 fluid coupling nuts. Next secure the 2 fan shroud bolts and the radiator reserve tank bolt to 5.0 Nm (51 kgf-cm, 44 in-lbf). After completing this work, install the reserve tank hose and fasten the 2 oil cooler hoses with hose clamps. Screw the 4 fluid coupling bolts to 21 Nm (214 kgf-cm, 15 ft-lbf) before installing the radiator support seal upper while inspecting the engine for coolant leaks. Add engine coolant as the final step. The assembly ends with the V-bank cover secured with 7.5 Nm (76 kgf-cm, 66 in-lbf) torque on the 2 nuts followed by the No. 1 engine under cover sub-assembly installation with 4 bolts tightened to 29 Nm (296 kgf-cm, 21 ft-lbf).

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