The Lexus RX350 from 2007 to 2015 is one of the most popular midsize luxury SUVs in the United States, known for its smooth performance and long-lasting reliability. However, even the most dependable vehicles eventually need an engine replacement due to high mileage, oil leaks, or mechanical failure. Replacing the engine can breathe new life into your RX350, making it feel like a new vehicle again. This guide walks you through the process step by step. At Power Engines, we provide road-legal replacement engines designed to OEM specifications, ensuring the perfect fit for your Lexus RX350.
Preparation and Tools Required
Before beginning, make sure you have the necessary tools and equipment: an engine hoist, jack stands, hydraulic jack, torque wrench, full metric socket and wrench set, pliers, screwdrivers, drain pans, and protective gloves. You’ll also need replacement fluids such as coolant, engine oil, and transmission fluid. Park the RX350 on a flat surface, disconnect the battery, and prepare for several hours of detailed work.
Step 1: Remove the Hood and Drain Fluids
Unbolt and remove the hood to give maximum clearance when pulling the engine. Drain all fluids including coolant, engine oil, and transmission fluid into proper containers for safe disposal. This step ensures a cleaner workspace and prevents contamination during reinstallation.
Step 2: Disconnect Wiring and Fuel Lines
Carefully label all wiring harnesses, sensors, and vacuum hoses before disconnecting them. Relieve pressure from the fuel system and detach the fuel lines. Documenting connections with photos is highly recommended to simplify reassembly.
Step 3: Remove Accessories and Cooling System
Detach the alternator, A/C compressor, and power steering pump. Secure the A/C and power steering units to the side if possible without disconnecting lines. Remove the radiator, fans, and all coolant hoses to create space for lifting the engine.
Step 4: Disconnect Exhaust and Transmission
Unbolt the exhaust manifold from the engine and catalytic converter. Support the transmission with a jack, then remove bolts securing the engine block to the transmission. Automatic RX350s require detaching torque converter bolts before separation.
Step 5: Unbolt Motor Mounts and Remove the Engine
Remove bolts from the motor mounts. Connect the engine securely to the hoist and carefully lift it from the bay. Double-check that no lines, wiring, or hoses are still attached before full removal.
Step 6: Prepare the Replacement Engine
Transfer essential components such as the intake manifold, exhaust manifold, and sensors from the old engine to the new one. Replace gaskets, seals, and belts for long-term reliability. At Power Engines, we supply Lexus RX350-compatible engines built to OEM specifications, ensuring proper fitment, emissions compliance, and long service life.
Step 7: Install the New Engine
Lower the replacement engine into the bay with the hoist. Align it with the motor mounts and transmission housing, then tighten bolts to factory torque specifications. Reconnect the exhaust, transmission, and accessories.
Step 8: Reconnect Wiring, Fuel, and Cooling Systems
Reattach wiring harnesses, vacuum hoses, and fuel lines according to your labels and photos. Reinstall the radiator, fans, and coolant hoses. Refill the system with fresh oil, coolant, and transmission fluid.
Step 9: Test and Break-In
Reconnect the battery and switch the ignition to ON, letting the fuel pump pressurize the system. Start the engine and let it idle while monitoring for leaks, unusual noises, or warning lights. During the first 500 miles, avoid high RPMs and aggressive driving. Change the oil after the break-in period for best results.
Replacing the engine in a Lexus RX350 (2007–2015) is a major project, but it’s one that can restore your SUV to peak performance when done correctly. With careful planning and the right step-by-step process, the job is manageable and rewarding. To ensure reliability and compliance, source your replacement engine from Power Engines, where every unit is road-legal and built to factory standards. By choosing a trusted supplier and following the proper process, you can extend the life of your Lexus RX350 and enjoy many more miles of smooth, dependable driving.
