Scion 15100-28020 Pump Assembly, Oil

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To remove the oil pump, you should start by removing the lower timing belt idler pulley and its stud. Then, remove the bolts securing the oil pump to the engine, and carefully pry between the front main bearing cap and the pump body if necessary.

To remove the oil pump, start by removing the timing chain cover. Once the cover is off, remove the relief valve plug and slide out the spring and relief valve. Next, remove the oil pump cover bolts and the oil pump cover itself. Take out the oil pump drive rotor and driven rotor. Inspect all the components for wear and damage, ensuring that the relief valve moves freely. Check the oil pressure relief valve sliding surface and valve spring, replacing them if necessary. Use a feeler gauge to measure the clearance of the driven rotor-to-oil pump body, rotor side clearance, and rotor tip clearance. Replace any worn parts or the entire oil pump assembly. To install the new oil pump, remove the old crankshaft seal from the timing chain cover and replace it with a new one, applying grease or oil to the outer edge and seal lip. Apply petroleum jelly to the pump drive and driven rotors and place them into position in the timing chain cover, ensuring the pump marks face outwards. Pack the pump cavity with petroleum jelly and install the cover, tightening the bolts to the specified torque. Lubricate the oil pressure relief valve and insert it, followed by the spring, into the pump cover. Screw in the plug and tighten it to the specified torque. Finally, reinstall the timing chain cover, add oil, install a new filter, and check for leaks while running the engine.

To remove the oil pump, start by taking off the oil pan, followed by the removal of nuts/bolts and detaching the oil pick-up tube assembly. Support the engine from above and proceed to remove the lower idler pulley, crankshaft pulley, timing belt, and crankshaft sprocket. Then, remove the 12 bolts to detach the oil pump case from the engine, and you may need to carefully pry between the front main bearing cap and the pump case with a screwdriver. Afterward, remove the two remaining bolts and separate the pump body from the case, lifting out the driven rotor and removing the O-ring. Clamp the pump sprocket in a padded vise and remove the sprocket nut and sprocket, followed by the drive rotor. Clean the pump case and engine block mating surfaces of sealant and old gasket material using a scraper and then clean them with lacquer thinner or acetone. Finally, remove the oil pressure relief valve snap-ring, retainer, spring, and piston for inspection. During inspection, clean all components with solvent and carefully examine them for wear and damage. Pay particular attention to the oil pressure relief valve piston sliding surface and valve spring. If there is any damage to the spring or valve, they should be replaced as a set. Check the driven rotor-to-case and drive rotor tip clearance with feeler gauges and compare the results to the specified values. If the clearance is excessive, replace the rotors as a set, and if needed, replace the oil pump case and body. For installation, remove the old drive rotor shaft seal and install a new seal using a deep socket and a hammer, applying multi-purpose grease to the seal lip. Repeat this procedure for the crankshaft seal. Install a new O-ring and lubricate the driven rotor with clean engine oil before placing it in the pump case with the mark facing out. Lubricate the shaft and install the drive rotor in the pump body, then reinstall the pulley and tighten the nut. Pack the pump cavity with petroleum jelly and attach the pump body to the case using the 16 mm-long bolts. Lubricate the oil pressure relief valve piston with clean engine oil and reinstall the valve components in the pump case. Place a new gasket on the engine block, ensuring that dowel pins hold it in place. Position the pump case against the block and install the mounting bolts, tightening them in a criss-cross pattern to avoid warping the case. Finally, install the oil pick-up tube assembly and baffle plate with a new gasket, tighten the fasteners, and proceed to reinstall the remaining parts in reverse order. After adding oil, start the engine, check for oil pressure and leaks, and recheck the engine oil level.

To install the drive chain and sprockets:Align colored links on the chain with alignment marks on the drive gears.Tighten the lower drive sprocket retention bolt to the specified torque.

To install the oil pump, lubricate the pump cavity with clean engine oil and position it with a new gasket against the block. Then, tighten the mounting bolts in a criss-cross pattern to avoid warping the body.

After disassembly, use a scraper to remove all traces of sealant and old gasket material from the pump body and engine block. Then, clean the mating surfaces with lacquer thinner or acetone.