General information and preparatory operations (Skoda Superb B6)

Note: This chapter describes the most typical and important engine maintenance and repair procedures, excluding procedures that require special skills and tools (for example, engine overhaul), - these works should be entrusted to car service specialists.

The dependences of torque and power on the crankshaft speed of some gasoline engines are shown in figures 1.1a-c.







The engine code consists of four letters; the first three of them mean the mechanical design, and the fourth means the engine characteristics, depending on its control unit. The engine serial number consists of six characters. If more than 999,999 engines were produced, the first digit in the number is replaced by a letter. The engine code is indicated on the vehicle data sticker and on the identification sticker (see Introduction). The first three characters of the engine code and its serial number are also stamped on the cylinder block above the place where it connects to the transmission (see illustrations 1.2a-b) or on a 3.6L engine, above the crankshaft pulley (see illustration 1.2c). In addition, the engine code and its number are indicated on an additional sticker, which is located on the intake manifold on the 3.6L engine, and on the top of the timing belt cover on other engines (see illustrations 1.2d). To view the additional sticker on the 1.4L engine, release the EVAP canister hose from the holder or use a mirror.











The engine is mounted transversely in the engine compartment located at the front of the car. All engines, except the 3.6-liter gasoline engine, are turbocharged and intercooled. The timing drive is carried out from the crankshaft: on gasoline models - by a chain, and on diesel models - by a toothed belt.



The cylinder block of petrol engines is made of cast iron. The 1.4, 1.8 and 2.0 l engines have variable intake camshaft timing, and the 3.6 l engine also has variable exhaust camshaft timing. The 1.8 and 2.0 l engines also use an intake manifold with a controlled swirl flap and balance shafts in the cylinder block. The 3.6 l engine uses internal exhaust gas recirculation and a 2-piece plastic intake manifold with variable geometry.

Diesel engines of various designs can be installed: 1.9 and 2.0 l with pump-injectors (TDI-PD), 2.0 l with a fuel distribution line (TDI-CR) of the 1st generation and 1.6/2.0 l TDI-CR of the 2nd generation. Due to the rarity of diesel models, a description of diesel engine repair is given only for the most common of them: 1.9 TDI-PD (BXE and BLS) and 2.0 TDI-CR of the 2nd generation (CFFB, CLJA and CFGB). For the remaining diesel engines, only specifications and general maintenance procedures are given. It should also be noted that a large number of diesel engine jobs not described in detail are performed in the same way as the corresponding jobs performed on the engines described.

Preparatory operations

Before performing any engine maintenance procedures, clean the engine compartment and the outer surfaces of the power unit using a special solvent. This treatment will prevent dirt from getting inside the engine.

If necessary, depending on the nature of the work to be done, the hood can be removed to provide free access to the components to be serviced (see Chapter 11). To avoid accidental damage to the paintwork, cover the car fenders with special covers or old blankets.



Excessive engine oil consumption can be considered a signal that it is necessary to check the condition of the piston rings, valve stem seals and/or valve guides. Naturally, first of all, you should make sure that the oil loss is not associated with the development of its external leaks. Check the compression in the cylinders (see Section 2) to determine the general condition of the engine.

Loss of power, loss of RPM stability, excessive valve noise and increased fuel consumption are usually fairly common signs that an engine overhaul is needed, especially when all of these factors occur simultaneously. If performing a full range of adjustments does not help to eliminate the problems, the only way out is to perform general mechanical work to restore the engine.

Major repairs of the power unit involve restoring all its operating parameters to the level typical of a new engine. During a major repair, piston rings are replaced and cylinder mirrors are restored (turning and/or honing). Usually, the main and connecting rod bearings of the crankshaft are replaced; if necessary, its journals can be turned and restored. Valve maintenance is mandatory; their condition at the time of the need for a major overhaul of the engine almost certainly leaves much to be desired. In parallel with the general overhaul of the power unit, a restorative overhaul of the starter and generator is usually also carried out.

Note: Critical cooling system components such as hoses, drive belt and thermostat must be replaced with new components during a major engine overhaul. In addition, the condition of the radiator should be carefully checked (see Chapters 1 and 3). If signs of leaks or obstruction are detected, the radiator should be replaced. Don't forget to check the condition of the oil pump as well.

Major engine repairs do not require high professional training from the performer, but they take quite a lot of time. You should plan to stop using the car for at least two weeks, especially if you need to seek help from a mechanical workshop to perform certain repairs.

Most of the work can be done using a standard set of locksmith tools, but some of the tests to determine the suitability of individual components for further use require the use of precision measuring equipment. In doubtful situations, seek help from service station specialists.

Note: Do not forget that the decisive factor in the question of the advisability of performing a major overhaul of the engine is the condition of its cylinder block. It is often cheaper and more reliable to replace a worn engine with a reconditioned one.

All removed electrical wiring ties and clamps must be installed in their original places during installation. Electrical wiring and hoses must be laid in the same way as they were located before removal. Therefore, the location of clamps, electrical wiring and hoses should be remembered or sketched/photographed.

In conclusion, it can be noted that all efforts to perform refurbishment of worn components will be wasted if the requirement of cleanliness during engine assembly is neglected.