The GMC Terrain from 2018 to 2022 is a sleek and modern SUV, praised for its technology, comfort, and efficiency. However, like any vehicle, its engine may eventually need replacement due to high mileage, mechanical failure, or oil-related issues. Replacing the engine can restore performance and reliability, ensuring your Terrain continues to serve for many more years. This guide outlines the step-by-step process. At Power Engines, we provide OEM-spec, road-legal replacement engines designed for the GMC Terrain, making installation smooth and dependable.
Preparation and Tools Required
Before starting the replacement, gather essential tools: an engine hoist, hydraulic jack, jack stands, complete socket and wrench sets, torque wrench, pliers, screwdrivers, and drain pans. Replacement fluids such as coolant, oil, and transmission fluid are also needed. Park your Terrain on a flat surface, disconnect the battery, and ensure the engine has cooled completely.
Step 1: Remove the Hood and Drain Fluids
Unbolt the hood to access the engine bay. Drain engine oil, coolant, and transmission fluid into approved containers. Proper disposal of these fluids is important to avoid mess and contamination.
Step 2: Disconnect Wiring, Sensors, and Fuel Lines
Label and disconnect all wiring harnesses, sensors, and vacuum hoses. Relieve the pressure from the fuel system and carefully disconnect the fuel lines. Taking photos of connections can help make reassembly easier.
Step 3: Remove Accessories and Cooling Components
Detach the alternator, starter motor, A/C compressor, and power steering pump. These can often be secured aside without disconnecting fluid lines. Remove the radiator, fans, and hoses to create space for engine removal.
Step 4: Disconnect Exhaust and Transmission
Unbolt the exhaust manifold from the catalytic converter or downpipe. Support the transmission with a jack, then remove the bolts connecting the engine to the transmission housing. Automatic GMC Terrain models require disconnecting the torque converter bolts before separation.
Step 5: Remove Motor Mounts and Extract the Engine
Unbolt the motor mounts on both sides. Attach the hoist securely to engine lifting points and carefully lift the engine out of the bay. Ensure all connections are free before extraction.
Step 6: Prepare the Replacement Engine
Transfer reusable parts from the old engine, such as intake and exhaust manifolds, sensors, and brackets, to the replacement unit. Replace gaskets, belts, and seals during this stage to improve long-term reliability. At Power Engines, our Terrain-compatible replacement engines are designed to meet or exceed OEM specifications, ensuring proper fitment and compliance with emissions regulations.
Step 7: Install the New Engine
Lower the replacement engine into the bay using the hoist, aligning it with the motor mounts and transmission. Torque bolts to factory specifications. Reconnect the exhaust, transmission, and accessory components.
Step 8: Reconnect Wiring, Fuel, and Cooling Systems
Reinstall all wiring harnesses, sensors, and fuel lines according to labels or photos. Refit the radiator, cooling fans, and hoses. Refill the system with new oil, coolant, and transmission fluid.
Step 9: Test and Break-In
Reconnect the battery and turn the ignition to ON to prime the fuel system. Start the engine and let it idle while checking for leaks, unusual noises, or dashboard warnings. Allow the engine to reach normal operating temperature. For the first 500 miles, avoid aggressive driving or high RPMs. Perform an oil change after this break-in period for maximum engine life.
Replacing the engine in a GMC Terrain (2018–2022) is a detailed process, but with preparation and patience, it can restore your SUV’s performance and dependability. By following this guide and sourcing your replacement from Power Engines, you ensure a smooth installation and peace of mind. With OEM-spec, road-legal engines, Power Engines helps keep your GMC Terrain running strong for years to come.
