Skoda Workshop Service and Repair Manuals

Replacing valve stem seal (with cylinder head installed) Special tools and workshop equipment required t  Pressure hose -MP 1-210- t  Valve lever -MP 1-211- with pressure plate t  Assembly device -MP 1-213 - t  Blank holder for valve spring - MP 1-229- t  Pressure plate -MP 1-229/1 - t  Extractor -MP 1-230- t  Insertion tool -MP 1-233- t  Spark plug wrench Removing –  Remove camshafts → Chapter. –  Remove bucket tappets (do not interchange) and lay aside with the contact surface facing down. –  Unscrew the spark plugs. –  Position piston of the relevant cylinder in bottom dead centre. Outlet side

–  Insert the assembly device -MP 1-213- and adjust bearing to the stay bolt height.   Note For installing the assembly device -MP 1-213- on the outlet side, the stud bolts on the outlet side have to be removed. –  Screw the pressure hose -MP 1-210- into the spark plug thread and apply constant pressure of at least 0.6 MPa in the cylinder. –  Remove valve springs with valve lever -MP 1-211-.   Note If valve collets are tight, slacken with slight blows of a hammer on the valve lever.

–  Pull off valve stem seals with extractor -MP 1-230-. Inlet side

The inlet valves have different installation angles in the cylinder head The blank holder -MP 1-229- indicates two different positions: t  1 - upper position, for the middle inlet valve t  2 - lower position, for both outer inlet valves t  3 - threaded bores, in which one M6x25 screw is screwed in on the left and right, which are used to attach the blank holder to the cylinder head.

–  Attach blank holder -MP 1-229- on the inlet side with both M6x25 screws to the cylinder head. –  Screw the pressure hose -MP 1-210- into the spark plug thread and apply constant pressure of at least 0.6 MPa in the cylinder. –  Adjust position for the corresponding inlet valve. –  Press valve springs with threaded spindle and pressure plate -MP 1-229/1- downwards and remove.   Note If valve collets are tight, slacken with slight blows of a hammer on the valve lever.

–  Pull off valve stem seals with extractor -MP 1-230-. Installing (inlet and outlet side)

–  To avoid damaging the new valve stem seals insert plastic bushing -A- on the valve stem. –  Lightly oil sealing lip of the valve stem seal. –  Insert valve stem seal -B- into the insertion tool -MP 1-233- and carefully push onto the valve guide.   Note Lightly oil the valve stem before beginning the assembly work when replacing inlet and outlet valves. –  Install camshafts → Chapter.   Note t  After installing the camshafts, the engine must not be started for about 30 minutes. The hydraulic clearance compensation elements must settle (otherwise valves would strike the pistons). t  After carrying out work on the valve gear, carefully crank engine at least 2 revolutions to ensure that no valve touches the piston when the engine is started.