Toyota 15100-0D021 Pump Assembly, Oil

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To remove the timing chain and crankshaft sprocket, detach the oil pump body from the engine by removing five bolts, using a screwdriver to pry between the block and pump body if needed. Clean 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. Remove the oil pressure relief valve from the pump body, then separate the pump cover from the body by removing three screws and lifting out the drive and driven rotors. Clean all components with solvent and inspect for wear and damage, checking the oil pressure relief valve piston sliding surface and valve spring, replacing them as a set if damaged. Measure the driven rotor-to-body clearance, rotor-to-cover clearance, and drive rotor tip clearance with a feeler gauge, replacing the rotors as a set if any clearance is excessive, and check the timing chain guide oil jet for blockage. Lubricate the drive and driven rotors with clean engine oil and place them in the pump body with the marks facing out, then pack the pump cavity with petroleum jelly and attach the pump cover, tightening the screws to the specified torque. Lubricate the oil pressure relief valve piston with clean engine oil and reinstall the valve components in the pump body, then place a new oil pump gasket on the engine block. Position the pump assembly against the block, install the mounting bolts ensuring the flats on the oil pump drive rotor align with the flats on the crankshaft, and tighten the bolts to the specified torque in three or four steps using a criss-cross pattern to avoid warping. Reinstall the remaining parts in reverse order, add oil if necessary, start the engine, and check for oil pressure and leaks.

Check the timing chain guide oil jet for blockage.