Cylinder head — removal and installation (Skoda Fabia 5J)

Assembly diagram

Important: Cylinder heads with cracks between the valve seats can be used without reducing their service life, if the cracks are small, maximum 0.5 mm wide. Additional machining of the cylinder head of diesel engines is not permitted. Replace the cylinder head bolts. When installing, replace the self-locking nuts and screws that are tightened according to the rotation angle, as well as the sealing rings and gaskets. In the case of assembling a replaceable cylinder head with an integrated camshaft, after installing the cylinder head, it is necessary to lubricate the contact areas between the plate tappets and the sliding surface of the cams with oil. The plastic caps that protect the exposed valves of the replacement cylinder head should only be removed immediately before installing the cylinder head. When replacing the cylinder head, the entire coolant fill volume must be changed. If the engine oil is contaminated, it is necessary to change the oil. The engine temperature must not exceed 35°C, otherwise the cylinder head could become twisted when the cylinder head mounting screws are loosened.

For engines with the letter designation BSW

1 - Before installing the cylinder head cover, the sealing surface should be thoroughly cleaned with a clean cloth; 2 - Pressure reducing valve for crankcase ventilation; 3 - To the rear pipe for supercharged air; 4 - Cover, if the seal is damaged, replace it; 5 - Lip seal, replace if damaged; 6 - Screw with guide sleeve, 10 Nm, all screws should be tightened by hand first; 7 - Cylinder head cover seal, replace if damaged; 8 - 20 Nm Eye; 9 - Central plug connector, for the pump-injector unit; 11 - 8 Nm; 12 - From the brake booster; 13 - Tandem type dual pump for vacuum and fuel supply; 14 - 20 Nm; 15 - Supply hose, from the fuel filter, white marking, ensure secure installation, secure with spring clamps; 16 - Drain hose, to the fuel filter, blue marking, ensure secure installation, secure with spring clamps; 17 - Seal, replace, observing markings; 24 - 20 Nm; 25 - Cylinder head, after replacement, refill the entire coolant volume; 26 - Glow plug, 15 Nm; 27 - Pump-injector unit; 28 - Replace cylinder head mounting bolt. Follow the sequence when loosening, follow the sequence when tightening, ensure that the gaskets are inserted into the cylinder head

For engines with letters BLS is designated

1 - Intake hose, to the tandem pump/brake booster connector; 2 - Cork; 3 - Connecting pipe, for engine crankcase ventilation, to the air intake sleeve; 4 - Screw with guide sleeve, 10 Nm, screws should be tightened by hand first, observe the sequence when loosening and tightening; 5 - Tandem type double pump; 6 - 20 Nm; 7 - 10 Nm; 8 - Coolant flange; 9 - O-ring seal, replace; 10 - 10 Nm; 11 - O-rings, replace; 12 - Mixing tube, inserted into the head, pull out using the hook; 13 - Cylinder head gasket, follow the markings; 14 - Hall sensor "G40", camshaft position; 15 - 10 Nm, install using fixing agent "D 000 600 A2"; 16 - 15 Nm; 17 -100 Nm, use the counter support "T10051" to loosen and tighten; 18 - Hub, with sensor wheel for Hall sensor "G40", for removal use puller "T10052"; 19 - Cylinder head, check flatness, change coolant after replacement; 20 - Replace cylinder head mounting bolt. Follow the sequence when loosening, follow the sequence when tightening, ensure that the gaskets are inserted into the cylinder head; 21 - Cylinder head cover seal, replace if damaged or leaking; 22 - Return fuel line; 23 - Fuel supply line; 24 - Coolant line; 25 - Cylinder head cover

Checking the flatness of the cylinder head

Important: Additional processing of the cylinder head on diesel engines is not permitted.

• part number ="arrow 1"
• control code ="arrow 2" (disregard)
• holes ="arrow 3"

Important: Depending on the piston interference fit to the cylinder block, cylinder head gaskets of varying thickness are installed for assembly. If only one gasket is replaced, it must be replaced with a gasket with the same marking.