UENR0623-02 9 Engine Operation Engine Operation The cylinders are honed to a specially controlled finish in order to ensure long life and low oil consumption. The cylinder block has five main bearings which support the crankshaft. Thrust washers are installed on both sides of number 3 main bearing in order to control the end play of the crankshaft. The thrust washers can only be installed one way. i04169549 Basic Engine Passages supply the lubrication for the crankshaft bearings. These passages are machined into the cylinder block. Introduction The eight major mechanical components of the basic engine are the following parts:
Cooling passages are cast into the cylinder block in order to allow the circulation of coolant. Cylinder block The cylinder block has a bush that is installed for the front camshaft journal. The other camshaft journals run directly in the cylinder block. Cylinder head Pistons The engine has a cooling jet that is installed in the cylinder block for each cylinder. The piston cooling jet sprays lubricating oil onto the inner surface of the piston in order to cool the piston. Connecting rods Crankshaft A Multi-Layered Steel (MLS) cylinder head gasket is used between the engine block and the cylinder head in order to seal combustion gases, water, and oil.
Timing gear case and gears Camshaft Cylinder Head Cylinder Block Illustration 5 g02859418 Typical example Illustration 4 g02859296 Typical example (1) Valve keepers (2) Valve spring retainer (3) Valve spring The cast iron cylinder block for the engine has four cylinders which are arranged in-line. The cylinder block is made of cast iron. The cylinder block provides support for the full length of the cylinder bores. The cylinder bores are machined into the block. The engine has a cast iron cylinder head (4). There is one inlet valve and one exhaust valve for each cylinder.