Skoda Workshop Service and Repair Manuals

Replacing valve stem seals Special tools and workshop equipment required t  Valve stem seal extractor -MP 1-230 (3364)- t  Valve stem seal insertion tool -MP 1-233 (3365)- t  Disassembly and assembly device for valve collets -VAS 5161- with knurled spacer ring -VAS 5161/23-1- and guide plate -VAS 5161/23- Work procedure –  Remove all glow plugs → Chapter. –  Remove the camshafts → Chapter. –  When installing again, mark the assignment of the roller rocker arms and the hydraulic clearance compensation elements. –  Remove the roller rocker arms together with the hydraulic balancing elements and lay aside on a clean surface. –  Put the piston of the relevant cylinder at „bottom dead centre“.

–  Position the guide plate -VAS 5161/23- onto the cylinder head. –  Screw the guide plate to the side of the intake manifold with the knurled screw -VAS 5161/12- and to the pin screws with 2 nuts M6 without collar -1- by hand until it fits on tightly.

–  Screw the sealing bolt -VAS 5161/10- into the guide plate. –  Screw the adapter -VAS 5161/11- into the relevant pencil type glow plug thread by hand.

–  Insert the impact drift -VAS 5161/3- into the guide plate and knock off the tightly fitted valve collets using a plastic hammer.

–  Screw the detent part -VAS 5161/6- with the interlocking fork -VAS 5161/5- into the guide plate. –  Slide the knurled spacer ring -VAS 5161/23-1- onto the assembly cartridge -VAS 5161/8-. –  Connect the adapter to the compressed air with a commercially available intermediate piece and apply constant pressure. l  Minimum pressure: 0.6 MPa (6 bar) overpressure. –  Hook the pressure fork -VAS 5161/2- onto the detent part and push the assembly cartridge downwards. –  Turn simultaneously the knurled screw of the assembly cartridge to the right, until the tips click into the valve collets. –  Rotate the knurled screw to the left and to the right, by doing so the valve collets are pressed apart and are installed in the assembly cartridge. –  Release the pressure fork. –  Remove the assembly cartridge with the knurled spacer ring. –  Remove the valve spring with the valve spring retainer.

–  Pull off valve stem seal with extractor for valve stem seal -3364-.

–  Fit the plastic bushing -A-, which is attached to the new valve stem seals -B-, onto the valve stem. –  Lightly oil sealing lip of the new valve stem seal. –  Slide the valve stem seal onto the plastic bushing. –  Carefully press the valve stem seal with the valve stem seal insertion tool -3365- onto the valve guide. –  Remove plastic sleeve.

If the valve collets were removed from the assembly cartridge, first of all they must be inserted into the insertion device for valve collets -VAS 5161/18-. l  The large diameter of the valve collets points to the top. –  Insert the valve spring and the valve spring retainer. –  Press the assembly cartridge from the top onto the insertion device for valve collets and lift up the valve collets.

–  Re-insert the assembly cartridge into the guide plate -VAS 5161/23-. –  Press down the pressure fork and turn the knurled screw to the left while pulling it upwards, by doing so the valve collets are inserted. –  Release the pressure fork on tightened knurled screw. –  Repeat the procedure for each valve. Assembling together Installation is performed in the reverse order, pay attention to the following points:   Note Ensure that all the roller arms are correctly positioned on the valve stem ends and are clipped in place on the relevant hydraulic balancing elements. –  Install camshafts → Chapter. –  Install glow plugs → Chapter.