How to Replace a Chevrolet Truck Engine
Replacing a Chevrolet truck engine is a difficult job that requires an engine hoist and stand. The job is much easier if you have a vehicle lift, though it can be done on the ground. You might remove the engine if it has to be rebuilt, or if you are putting a new engine in the truck. Chevrolet has several different truck engines in several different trucks, but the process is the same in all models. There are small differences for each engine, though, such as the location of certain parts.
Drive or tow the vehicle to a shop that has an EPA-certified container for Freon. Have the shop reclaim the Freon — you cannot evacuate Freon into the atmosphere.
Match mark the hood bolts on the hood, so the hood can be reinstalled properly. Remove the hood, using the appropriate socket. Disconnect the negative battery cable, using the appropriate wrench. Set it aside, ensuring that it does not touch metal. Disconnect the positive battery cable. Remove the battery, using the appropriate socket. Follow the negative cable to it attaching point. If it is on the engine, remove it. If it is on the body or frame, it is not in the way and you may leave it attached.
Slide a drain pan under the radiator petcock. Loosen the petcock and allow the coolant to drain. Remove the radiator cap for faster draining. Dispose of the antifreeze in an appropriate manner. Jack up the front of the vehicle, using the floor jack. Support it with jack stands. Slide the other drain pan under the oil pan. Remove the oil drain pan bolt and allow the oil to drain. Reinstall the bolt. Dispose of the oil in an appropriate manner. Do not mix it with the antifreeze. Lower the vehicle off the jack stands, using the floor jack.
Disconnect the accelerator cable from the throttle lever, using the screwdriver or socket, depending on the type of attachment. If you have an automatic, remove the detent cable from the throttle lever, using the screwdriver or socket. Loosen the hose clamps on the air duct, using the screwdriver. Pull the air duct off the air cleaner assembly, then remove the air cleaner assembly, using the appropriate sockets.
Mark all wiring harness connectors and vacuum hoses on the engine, using the tape and marker. Unplug all wiring harness connectors. Loosen the hose clamps on the vacuum lines, then pull the vacuum lines off the engine.