Repair operations possible with the engine in the vehicle
1. Many major repair operations can be done without removing the engine from the vehicle.
2. Clean the engine compartment and the exterior of the engine with degreaser before any work is done. It’ll make the job easier and help keep dirt out of internal parts of the engine.
3. It may be helpful to remove the hood to improve engine access when repairs are performed (see Body). Cover the fenders to prevent damage to the paint. Special pads are available, but an old bedspread or blanket will also work.
4. If vacuum, exhaust, oil, or coolant leaks develop, indicating a need for gasket or seal replacement, the repairs can generally be done with the engine in the vehicle. The intake and exhaust manifold gaskets, timing chain cover gasket, oil pan gasket, crankshaft oil seals, and cylinder head gaskets are all accessible with the engine in the vehicle.
5. Exterior engine components, such as the intake and exhaust manifolds, the oil pan, the oil pump, the timing chain cover, the water pump, the starter motor, the alternator, and fuel system components can be removed for repair with the engine in the vehicle.
6. Cylinder heads can be removed without pulling the engine. Valve component servicing can also be done with the engine in the vehicle. Replacement of the timing chain and sprockets is also possible with the engine in the vehicle, as is camshaft and valve train removal and installation.
7. Repair or replacement of piston rings, pistons, connecting rods, and rod bearings is possible with the engine in the vehicle, however, this practice is not recommended because of the cleaning and preparation work that must be done to the components.