Lexus 15100-20050 Pump Assembly, Oil

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On 2008 and later models, the oil pump cannot be serviced separately from the timing chain cover; if defective, both must be replaced as a unit. To remove the oil pump, first take off the timing chain and crankshaft sprocket, then remove the oil pump drive chain and sprockets by rotating the engine 90 degrees counterclockwise from TDC, setting the crankshaft key to the left horizontal position, and loosening the retaining bolt while locking the lower gear in place. Next, detach the oil pump body by removing three bolts, prying carefully if necessary, and clean all traces of sealant and old gasket material from the pump body and engine block. Inspect the oil pump and chain for wear and damage; if there are signs of wear, replacement is recommended. Measure the diameter of the sprockets across the chain rollers, and if below the minimum diameter, replace the chain and sprockets. Check the oil jet for blockages to prevent excessive wear. For installation, lubricate the pump cavity with clean engine oil, position the oil pump with a new gasket against the block, and install the mounting bolts, tightening them in a crisscross pattern. Install the drive chain and sprockets, ensuring the colored links align with the marks on the drive gears, then tighten the lower drive sprocket retaining bolt. Reinstall the remaining parts in reverse order, add oil to the proper level, start the engine, and check for oil pressure and leaks.

Check the clearance of the following components and compare the measurements to this Chapter's Specifications: a) Driven rotor-to-oil pump body clearance b) Rotor side clearance c) Rotor tip clearance.

Check the oil pressure relief valve sliding surface and valve spring. If either the spring or the valve is damaged, they must be replaced as a set.

Apply multi-purpose grease or engine oil to the outer edge of the new crank seal and carefully drive it into place with a deep socket and a hammer. Apply multi-purpose grease or engine oil to the seal lip.

Check the oil pressure relief valve sliding surface and valve spring. If either is damaged, they must be replaced as a set.

Wrap the chain around each of the oil pump drive sprockets and measure the diameter of the sprockets across the chain rollers. If the measurement is less than the minimum sprocket diameter, the chain and the timing sprockets must be replaced.