Skoda Workshop Service and Repair Manuals

Install timing belt (set the timing)   Caution The work procedure which is described here must be precisely respected. If, for example, the final check is not carried out and the rig tools are not inserted again, there is a risk that the timing is not correctly set and the vehicle shows signs of poor vehicle handling and idle jerking occurs. l  Interlock camshafts with locking pins -3359- or -MP 1-301-. l  Crankshaft is locked with crankshaft arrester -T10050- or crankshaft arrester -T10100-. l  Tensioning pulley interlocked with rig tool -T10265- and fixed with fixing nut up to right stop.   Note t  Always perform adjusting work on the toothed belt only on a cold engine. t  When rotating the camshafts, the crankshaft must not be positioned at TDC for any one piston. Risk of damaging valves and pistons.

–  Slightly screw in screws -arrows-. l  It must still be possible to turn the toothed belt sprockets on the hubs, however they must not hang loose. –  Turn toothed belt sprockets clockwise in the elongated holes as far as the stop. –  Fit toothed belt onto toothed belt sprocket of crankshaft, tensioning pulley, toothed belt sprockets, large guide pulley and, last of all, onto the toothed belt sprocket of the coolant pump. Adjust the tension of toothed belt as follows: –  Loosen the fixing nut of the tensioning pully and pull the rig tool -T10265- out of the tensioning pulley.

–  Pay attention to the correct fitting of the tensioning pulley in the opening in the rear toothed belt guard -arrow-.

–  Turn the eccentric of the tensioning pulley with offset screwdriver -T10264- clockwise until the pointer -2- stands in the centre of the base plate in the gap.   Note Ensure that the fixing nut does not turn. –  Hold the eccentric of the tensioning pulley in this position and tighten fixing nut of tensioning pulley to 20 Nm and torque a further 45° (1/8 turn).   Note When tightening the fixing nut, the pointer -arrow- turns maximum 5 mm to the right from the gap of the base plate. This position must not be corrected, because the toothed belt settles when running-in.

–  Insert counterholder -T10172- with bolts -T10172/4-, as shown, and press in -direction of arrow-. –  Keep toothed belt sprockets with counterholder -T10172- under tension and tighten screws -arrows- of both toothed belt sprockets to 25 Nm. –  Remove locking pins -3359- and crankshaft arrester -T10050- or crankshaft arrester -T10100-. Test timing: –  Turn crankshaft 2 turns in the direction of running of the engine until the crankshaft is positioned shortly before TDC for cylinder 1.

–  Interlock during this motion the hub -A- in the direction of running of the engine with locking pin -3359-. –  Check whether: t  the hub -B- can be interlocked with the locating pin -3359-; t  the crankshaft can be arrested with the crankshaft arrester -T10050- or crankshaft arrester -T10100-;

t  the pointer -2- of the tensioning pulley must be in the area -a- of the base plate -1-.

If the hub -B- cannot be arrested: –  Loosen fixing screws -2- of toothed belt sprocket of inlet camshaft -B-. –  Fit ring spanner onto the central screw for the inlet camshaft. –  Turn the hub until the locking pin -3359- can be inserted. –  Tighten screws -2- of toothed belt sprocket of inlet camshaft -B- to 25 Nm. –  Remove locking pins -3359- and crankshaft arrester -T10050- or crankshaft arrester -T10100-. –  Rotate the crankshaft 2 turns in the direction of running of the engine until the crankshaft is positioned again on TDC for cylinder 1. –  Repeat timing test → Anchor. If the crankshaft cannot be arrested:

–  Loosen screws -1- and -2- of toothed belt sprockets -A- and -B-.

–  Rotate crankshaft in direction of rotation of engine until it can be arrested with the crankshaft arrester.   Note t  The stud -arrow- must engage into the hole in the sealing flange. t  If the crankshaft was turned behind the TDC for cylinder 1, turn crankshaft back slightly and once again set to the TDC for cylinder 1 by turning in direction of rotation of engine.

–  Insert counterholder -T10172- with bolts -T10172/4-, as shown, and press in -direction of arrow-.

–  Keep toothed belt sprockets with counterholder -T10172- under tension and tighten screws -1- and -2- of toothed belt sprockets -A- and -B- to 25 Nm. –  Remove locking pins -3359- and crankshaft arrester -T10050- or crankshaft arrester -T10100-. –  Rotate the crankshaft 2 turns in the direction of running of the engine until the crankshaft is positioned again on TDC for cylinder 1. –  Repeat timing test → Anchor. Further installation Further installation occurs in reverse order to removal. Pay attention to the following: t  Observe the instructions for installing the hose connections with push-fit couplings → Chapter.