There are many repairs that can be done without removing the engine from the car.
Before starting any repair work, wash the vehicle's engine compartment and engine with detergent. This will facilitate the work and prevent dirt from entering the engine.
Depending on what parts you will have to deal with during the repair work, it may be necessary to remove the hood to free access to them (if necessary, contact chapter 11). Cover the fenders to prevent damage to the paintwork.
If there are leaks from the vacuum system, cooling system or exhaust system, gaskets or seals can be replaced in them without removing the engine from the vehicle. The intake and exhaust manifold gaskets, timing chain cover gasket, oil sump gasket, front camshaft bearing collar and cylinder head gasket are easily accessible without removing the engine. External engine parts such as intake and exhaust manifolds, oil sump and oil pump, coolant pump, starter motor, alternator and fuel system components can also be repaired without removing the engine from the vehicle.
Because the cylinder heads can be removed without removing the engine, timing maintenance can also be performed with the engine on the vehicle. Replacing the timing chain and sprockets is also possible without removing the engine.
In extreme cases, due to the lack of necessary equipment, it is possible to repair or replace piston rings, pistons, connecting rods and connecting rod bearings with the engine not removed. However, this practice is not recommended due to the need to perform cleaning and preparation of these parts.