Note: Minor engine repairs are repairs that can be performed without removing the engine from the vehicle. All information regarding engine removal, installation, and overhaul is provided in the next section.
Clean the engine compartment and engine surface before starting work. This will prevent dirt from getting into the internal engine components.
You may need to remove the hood to gain easier access to the components. Cover the fenders with a rag to avoid damaging the paint.
If there is a need to replace a gasket or seal (due to a vacuum, oil, coolant or exhaust leak), repairs can usually be made in the engine bay. The intake and exhaust manifold gaskets, oil pan gasket, crankshaft seals, and cylinder head gasket are usually accessible without removing the engine.
External components such as the intake and exhaust manifolds, oil pan, oil pump, water pump, starter, alternator, distributor and fuel system components can also be removed for repairs without removing the engine.
Also described below is the removal of the cylinder head. Repairs to the camshaft, rocker arms and valves are easiest to perform after the engine is removed.
However, on some engines the camshaft can be removed without removing the engine, as it is held in position by bearing caps.
As a last resort (in the absence of the necessary equipment) repair or replacement of piston rings, pistons, connecting rods and connecting rod bearings can be performed without removing the engine. However, this is not recommended due to the complexity of the preparatory cleaning of the components and the risk of dirt getting into the engine.