Question 1

How to remove, inspect, and install Oil Pump in V8 engine on 2003 through 2009 Toyota 4Runner?

Accepted Answer

To remove the engine, first detach the oil pan, oil pick-up tube, and strainer. Next, take off the timing belt along with the number 1 and number 2 idler pulleys, followed by the crankshaft timing sprocket and crankshaft position sensor, noting that the oil pump body is located behind the crankshaft sprocket. Proceed to remove the oil filter/cooler assembly and the eight mounting bolts to detach the oil pump from the front of the engine, using a screwdriver to pry it off if necessary, while being cautious to avoid damaging the sealing surfaces. Remove the O-ring from the engine block, and for models from 2004 and earlier, take out the oil pressure relief valve snap-ring from the bottom of the oil pump; for 2005 and later models, remove the plug from the bottom of the oil pump to allow the retainer, spring, and valve to slide out. Use a large Phillips screwdriver to take out the screws holding the body cover to the rear of the oil pump, then lift the cover off and remove the pump rotors. Clean all traces of sealant and old gasket material from the pump body and engine block with a scraper, followed by cleaning the mating surfaces with lacquer thinner or acetone. For inspection, ensure to use the clearance specifications for the 4.7L V8 engine. For installation, pry out the old crankshaft seal and apply multi-purpose grease or engine oil to the outer edge of the new seal before carefully driving it into place with a deep socket and hammer, also greasing the seal lip. Place the drive and driven rotors into the pump body with the marks facing out, pack the pump cavity with petroleum jelly, and install the cover, tightening the screws securely in a criss-cross pattern. Lubricate the oil pressure relief valve with engine oil and install the valve components in the pump body. Clean the gasket surfaces with acetone or lacquer thinner to remove all traces of oil, then apply a 2 to 3 mm wide bead of RTV sealant to the oil pump, ensuring not to use excessive amounts, especially around oil passages and bolt holes, and complete the assembly within five minutes of sealant application. Position a new O-ring on the block at the top of the oil pump, engage the spline teeth on the oil pump drive rotor with the large teeth on the crankshaft, and slide the pump into place. Install the oil pump mounting bolts in their original locations and tighten them to the specified torque in a criss-cross pattern. Using a new gasket, install the oil pick-up tube and tighten the fasteners to the specified torque. Finally, reinstall the remaining parts in the reverse order of removal, refill the engine oil and coolant, start the engine, and check for oil leaks.

Question 2

How to remove, inspect, and install the oil pump in 3.5L V6 engine on Toyota Highlander?

Accepted Answer

The oil pump is mounted inside the timing chain cover and therefore to release the cover you need to remove this pump. Turn the relief valve plug counterclockwise with a 27 mm socket to take it out, as well as the spring and the valve. Next unscrew the oil pump cover bolts and remove the oil pump cover and then remove the oil pump drive rotor and then the driven rotor. Wipe all parts with solvent and check for sign of wear or damage, the oiled relief valve should be able to move back and forth inside its bore. This valve has a sliding surface and a valve spring; both are changed as a set if worn out. Check the gap of the driven rotor-to-body, rotor side and tip by utilizing feller gauge and precision straight edge with corresponding replace worn parts or the new entire oil pump assembly. To remove the old crankshaft seal, pry it out from the timing chain cover and applying multi-purpose grease or engine oil on the outer part of the brand new crank seal to be installed and knock it into the cover using a deep socket and hammer, ensuring that the seal lip is also lubricated. Apply petroleum jelly with thin coat uniformly to the pump drive and driven rotors, place them in the timing chain cover where the marks are pointed out. Pour petroleum jelly into the pump cavity, put on the cover and, using a torque wrench, tighten the bolts to the required nominal torque. Grease the oil pressure relief valve with some clean engine oil and place it together with the spring in the pump cover and tighten the plug. Last, refit the timing chain cover, reverse through the steps of removal, fill with oil, put in a new filter, start the engine, and look for signs of leakage.

Question 3

How to remove, inspect, and install Oil Pump in V6 engine on 2005 through 2009 Toyota Tacoma?

Accepted Answer

Before now, unscrew both of the timing chain cover mounting bolts and then uncouple the coupling of the oil pipe that is mounted between the timing chain cover and the block and get rid of the two worn out oil pipe O-rings. After that, use a spanner while holding the oil pump with another hand to loosen the oil pump cover bolts and thereafter, the oil pump cover, the oil pump drive rotor and the driven rotor. Remove oil pressure relief plug, valve spring and valve from the oil pump cover. Wipe all parts with solvent and have a close look at their status: the oil relief valve should move effortlessly inside its hole. Examine the contact face of the oil pressure relief valve and the valve spring; if either of the components is defective, replace them together. By using a feeler gauge measure the following; the clearance of the driven rotor to the body, the rotor side, and the rotor tip and record the values and compare. Tap out the worn out crankshaft seal by referring to the timing chain cover, and apply multi-purpose grease or engine oil on the outer lip of the new crank seal before moulding it in. Smear the seal lip with petroleum jelly and do the same for the pump drive and driven rotors and then fit these in the timing chain cover whereby the pump marks are outward. Petroleum jelly must then be packed into the pump cavity of the motor to assist in the priming process of the pump; then the cover and the bolts will have to be secured with the correct torque. Coat the rag with clean engine oil and insert the oil pressure relief valve and spring into the pump cover and tightened the plug to the right torque tightness. Last but not least, replace the timing chain cover, and after completing the installation in the reverse sequence of the removal, pour the oil into the engine, fit the new filter and start the engine for the check the signs of leakage.

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