Many overhaul operations can be performed without removing the engine from the vehicle.
Before starting work, clean the engine compartment and the outside of the engine with a suitable degreaser. This will make the job easier and help remove dirt from the interior of the engine.
Depending on the parts you are working on, it may be useful to remove the hood to improve access to the engine when doing repairs (if necessary, contact chapter 11). Close the fenders to prevent damage to the paintwork. Special covers are provided for this, but an old bedspread or blanket will also work.
If there are vacuum, exhaust, oil, or coolant leaks that indicate a gasket or seal needs to be replaced, repairs can usually be made without removing the engine from the vehicle. The intake and exhaust manifold gaskets, oil pan gasket, crankshaft seals and cylinder head gasket are accessible without removing the engine.
External engine components such as the intake and exhaust manifolds, oil pan, oil pump, water pump, starter motor, alternator and fuel system components can be removed without removing the engine from the vehicle.
Since the cylinder head can be removed without removing the engine, maintenance of the camshafts and valve train components can also be performed without removing the engine from the vehicle. The timing chain and sprockets can also be replaced without removing the engine from the vehicle.