Skoda Workshop Service and Repair Manuals

Removing and installing timing chain and drive chain for cylinder head version A For engine with identification characters BTS, CFNA, CLSA Special tools and workshop equipment required t  Counterholder -T30004 (3415)- t  Extractor -T10094A- t  Adapter for dial gauge -T10170- t  Camshaft fixer/locator -T10171A- t  Counterholder -T10172- t  Rig pin -T40011- t  Dial gauge Removing –  Unscrew cap for camshafts. –  Remove ignition coil from cylinder 1 → Chapter and release the spark plug.

–  Screw adapter for dial gauge -T10170- up to the stop into the spark plug thread. –  Insert the dial gauge -A- with extension -T10170/1- up to the stop and fix in place using the clamping screw -arrow-. –  Rotate the crankshaft in direction of rotation of engine on TDC for cylinder 1. Note down the position of the small pointer of the dial gauge.

The holes -arrows- in the camshafts must be positioned as shown. If necessary rotate the crankshaft a further revolution (360°).   Note t  If the crankshaft was turned more than 0.01 mm past the top dead centre, the crankshaft must once again be turned approx 45° in the opposite direction of rotation of the engine. Then position the crankshaft in direction of rotation of engine on top dead centre of cylinder 1. t  Permissible deviation from TDC for cylinder 1: ± 0.01 mm.

–  Insert camshaft fixer/locator -T10171A- up to the stop into the holes in the camshaft housing. l  The locking bolts -arrows 1- must engage in the holes -arrows 2-. The inscription „TOP“-arrow 3- must be at the top.

–  To secure the camshaft fixer/locator -T10171A- screw in a M6 screw -arrow- by hand; do not tighten. –  Remove timing case → Chapter.

–  Pull off cover -1- from chain sprocket of oil pump.

–  Press the tensioning rail by hand in the -direction of the arrow- and interlock the piston with the rig pin -T40011-. –  Remove chain tensioner -2-.

–  Mark with a suitable felt-tip pen the direction of rotation of the timing chain -3-. For engine with identification characters BTS   Note The fixing screw of the camshaft adjuster -2- has a left-hand thread. –  Release screws -2- and -4- and remove the camshaft adjuster -1- with the timing chain -3-. Use counterholder -T10172- to counterhold. For engine with identification characters CFNA, CLSA

–  Release screws -2- and remove chain sprocket of inlet camshaft -1- with timing chain -3-. Use counterholder -T10172- to counterhold. Continued for all engines

–  Hold chain sprocket of oil pump with counterholder -T10172- and slacken fixing screw -1-.

–  Lever out tensioning spring -1- at the screw -2- with a screwdriver and remove tensioning spring -1-. –  Unscrew fixing screw -3- and remove the chain tensioner.

–  Mark with a suitable felt-tip pen the direction of rotation of the drive chain for oil pump -2-. –  Unscrew the fixing screw of the chain sprocket -1- and remove the chain sprockets -1- and -3- together with the drive chain for oil pump -2-. Install l  The crankshaft must be positioned on TDC for cylinder 1.

–  Push chain sprocket -1- in -direction of arrow- up to the stop onto the crankshaft journal.   Caution The integrated peg -2- of the chain sprocket -1- must fit into the slot -3- at the crankshaft stub.

–  Mark the positions of the chain sprocket and the crankshaft to the cylinder block with a felt-tip pen.

–  Fit the drive chain for oil pump -3- onto the chain sprocket -1-. –  Place the chain sprocket of the oil pump -2- into the drive chain for oil pump -3- and position onto the drive shaft of the oil pump.   Note t  Observe the marking of the running direction on the drive chain for oil pump. t  The chain sprocket of the oil pump only adapts to one postion on the drive shaft of the oil pump -arrow-.

–  Hold the chain sprocket of the oil pump with the counterholder -T10172-. –  Tighten fixing screw -1- to 20 Nm + torque a further 90° (1/4 turn).

–  Position the chain sprocket onto the drive chain for the oil pump and tighten the fixing screw -3- to 15 Nm. –  Lever the tensioning spring -1- onto the screw -2- with a screwdriver.   Note t  Observe the markings -arrows-. t  The crankshaft should not turn. For engine with identification characters BTS

–  Screw on the chain sprocket -3- by hand with a new fixing screw. –  Place the timing chain -1- onto the chain sprocket of the crankshaft -4-, the chain sprocket of the outlet camshaft -3- and screw on the camshaft adjuster -2- with a new fixing screw.   Note t  Observe the marking of the running direction on the timing chain -1-. t  Make sure that the guide sleeve is installed between the inlet camshaft and camshaft adjuster. t  On engine with identification characters BTS, the fixing screw of the camshaft adjuster -2- has a left-hand thread. For engine with identification characters CFNA, CLSA

–  Screw on the chain sprocket -3- by hand with a new fixing screw. –  Place the timing chain -1- onto the chain sprocket of the crankshaft -4-, the chain sprocket of the outlet camshaft -3- and screw on the chain sprocket of the inlet camshaft -2- with a new fixing screw.   Note Observe the marking of the running direction on the timing chain -1-. Continued for all engines

The timing chain must rest on the sliding rail -1- and on the chain sprocket of the crankshaft -arrow-.

–  Install the chain tensioner -1- and tighten the fixing screws -2- to 9 Nm. –  Tighten the timing chain, by pulling out the rig pin -T40011- from the chain tensioner. –  Check markings on the chain sprocket of the crankshaft and on the cylinder block; they must be positioned opposite to each other. For engine with identification characters BTS

–  Tighten the fixing screw -2- to 40 Nm and the screw -4- to 50 Nm (use counterholder -T10172-). For engine with identification characters CFNA, CLSA

–  Tighten fixing screws -2- to 50 Nm (use counterholder -T10172-). Continued for all engines   Note t  First the fixing screws -2- and -4- are tightened to the torquing angle 90° (1/4 turn), after which the timing is checked. t  On engine with identification characters BTS, the fixing screw of the camshaft adjuster -2- has a left-hand thread.

–  Screw out screws -arrow- and remove the camshaft fixer/locator -T10171A- from the camshaft housing. –  Test timing → Chapter. If timing is o.k.: For engine with identification characters BTS

–  Hold the camshaft sprockets with the counterholder -T10172- and torque the fixing screws -2- (left-hand thread) and -4- a further 90° (1/4 turn) with a rigid wrench. For engine with identification characters CFNA, CLSA

–  Hold the camshaft sprockets with the counterholder -T10172- and torque the fixing screws -2- a further 90° (1/4 turn) with a rigid wrench. Continued for all engines   Note t  On engine with identification characters BTS, the fixing screw of the camshaft adjuster -2- has a left-hand thread. t  The camshaft chain sprockets must not turn when tightening.

–  Install cover for oil pump gear -1-. –  Install timing case → Chapter. The further assembly is carried out in reverse order to disassembly.