The mechanical Parts of the engine assembly can be broken down into the number of sub-assemblies, or groups of associated components, although these are usually referred to merely as assemblies – for example Cylinder-Head assembly and piston assembly.
There are two side views a of 4 Cylinder engine which has two over head camshafts. Some parts of an Engine are there internal and other parts. This illustration identifies a number of external parts.
This is attached to the end of the crankshaft. It drives the ribbed belt of the alternator.
2. Timing cover.
3. Oil Pump.
Right hand side of the engine
There are upper and lower parts of the assembly. They are designed to facilitate the air flow into the engine.
2. Throttle body assembly
3. Fuel Rail
4. Engine Electronic Control Unit (ECU).
This controls the electronic the fuel injection system and also many other engine functions.
1. Exhaust Manifold
2. Oil Pan
3. Oil Filter
4. Oil dipstick
Other Parts of the engine
1. Top cover
3. Mounting flange
The various components of the engine are assembled together during manufacture and most of these are secured by means
- With in-line engines, there is a crank for each cylinder but, with some V-type engines, there
A ring gear is fitted to the rim of the flywheel so that the engine can be rotated by the starter pinion when starting the engine.
Pistons and Connecting Rods
Camshafts and Valves
|Intake & Exhaust Valves|
Intake (Small) Exhaust (Big)
The camshaft could even be one or two in the cylinder head sometimes to operate the intake and exhaust valves separately (One camshaft for the intake side and the other shaft for the exhaust side). Engines having one and two camshaft are known as SOHC (Single overhead camshaft) and DOHC (Double/Dual overhead camshaft) consecutively. QOHC (Quad overhead camshaft is used in v-type diesel engines)
Valve cover, also called cylinder head cover, is fitted to the top of the cylinder head. This encloses the valve mechanism. An additional cover on the top of the engine covers the ignition coils.
The cylinder head arrangement, for a four-cylinder engine, has two camshafts (DOHC) and sixteen valves. Other four-cylinder engines can have two camshaft and twelve valves or one camshaft (SOHC) and eight valves. (Mentioned on the engine top cover or sticker pasted on the back windshield).
Gaskets, seals and small parts
Oil Pan and Oil Filter
Throttle body assembly
Water pump and pulley