Volkswagen Workshop Service and Repair Manuals

Removing and installing toothed belt (vehicles with engine support with greater clearance to engine)

Special tools and workshop equipment required

t	Diesel injection pump locking pin -3359-

t	Locking pin -T10060 A-

t	Crankshaft stop -T10100-

t	Counterhold tool -T10172-

t	Special wrench, long reach -T10264-

t	Locking tool -T10265-

Removing   Note Adjustment work on toothed belts must be performed only on cold engines, as the indicator position on the tensioning element varies depending on the engine temperature.

–  Remove engine cover. To do this, pull engine cover upwards abruptly at front and right -arrows A- and then pull forwards out of rear fastening -arrow B-. –  Remove poly V-belt → Chapter. –  Remove poly V-belt tensioning element. –  Remove upper toothed belt guard. –  Remove front right wheel housing liner. –  Remove exhaust pipe from auxiliary heater.

–  Loosen connecting bolt for coolant pipe -arrow-. –  Remove charge air pipe between charge air cooler and turbocharger. –  Carefully cover or seal open ends. –  Remove vibration damper/belt pulley. –  Remove lower and centre toothed belt guards –  Turn crankshaft to TDC No. 1 cylinder.   Note

Turn crankshaft until marking on crankshaft pulley and tooth segments of camshaft pulleys are on top. Marking on toothed belt guard must align with camshaft sender wheel -arrows-. –  Lock crankshaft toothed belt pulley with crankshaft stop -T10050 bzw. T10100-. To do this, push crankshaft stop into teeth of belt pulley from face side.   Note The marks on the crankshaft toothed belt pulley and the crankshaft stop must align. When doing this, the pin of the crankshaft stop must insert in the drilling of the sealing flange.

–  Separate push-on connectors of fuel lines -arrows-.   Note t  Do this by pressing in catch of push-on connectors. t  Ensure that no fuel escapes (use a cloth). –  Lay fuel filter with hoses to side. –  Disconnect coolant hose from top of expansion tank. –  Remove expansion tank and lay it to side. –  Mark direction of rotation of toothed belt.

–  Loosen camshaft pulley securing bolts -1 and 2- until camshaft pulleys can be turned in elongated holes. –  Lock hubs using locking pin -3359-. To do this, slide locking pins through outer free elongated holes into holes in cylinder head. –  Loosen tensioning roller securing nut.

–  Turn eccentric of tensioning roller anti-clockwise -arrow- using socket -T10264-, until the tensioning roller can be locked with locking tool -T10265-.

–  Now turn tensioning roller eccentric clockwise -arrow- onto stop and tighten securing nut -1- hand-tight. –  Remove toothed belt first from coolant pump and then from remaining pulleys. Installing   Caution Strictly follow the procedure described here. If, for example, the final check is not performed and the locking tool is not fitted again, there is a danger that the timing is not correctly adjusted and the vehicle will exhibit engine running problems and rough idling.   Note Adjustment work on toothed belts must be performed only on cold engines, as the indicator position on the tensioning element varies depending on the engine temperature. l  Tensioning roller must be locked with locking pin -T10265- and secured to right stop. l  Camshafts are locked using diesel injection pump locking pin -3359-. l  Crankshaft is locked using crankshaft stop -T10050 bzw. T10100-. –  Turn camshaft pulleys in their elongated holes clockwise to stop. –  Guide toothed belt through gap between engine support and engine. –  Fit toothed belt to crankshaft pulley, tensioning roller and camshaft pulley and idler roller. –  Then fit toothed belt on coolant pump toothed belt pulley. –  Loosen tensioning roller securing nut and pull out locking pin -T10265-.   Note

Ensure that tensioning roller seats correctly in rear toothed belt guard -arrow-.

–  Turn eccentric of tensioning roller clockwise -arrow- using special wrench, long reach -T10264- until indicator -2- is in middle of gap in base plate. Ensure that securing nut does not turn as well. –  Hold tensioning roller in this position and tighten tensioning roller securing nut as follows: 20 Nm and 45° (1/8 turn) further.   Note When securing nut is tightened, indicator will turn maximum 5 mm to right out of base plate notch. This setting must not be corrected because the toothed belt will settle after it has run a while.

–  Apply counterhold -T10172- as shown. Press counterhold -T10172- in direction of arrow keeping camshaft pulley under tension. –  In this position, tighten camshaft pulley securing bolts -arrows- to 25 Nm. –  Remove locking pins -3359- and crankshaft stop -T10050 bzw. T10100-. –  Turn crankshaft at least two rotations in engine direction of rotation and set again to just before TDC No. 1 cylinder.

–  Lock hub -A- by turning in engine direction of rotation until locking pin -3359- engages whilst turning. –  Check whether: t  Hub -B- can be locked using locking pin -3359-. t  Crankshaft can be locked in position with crankshaft stop -T10050 bzw. T10100-. t  Tensioning roller indicator is centred or maximum 5 mm to right of base plate notch. If the hub -B- cannot be locked: –  Loosen camshaft pulley -A- securing bolts -1-. l  Hub -A- must be locked using locking pin -3359-.

–  Turn crankshaft until hub of camshaft pulley -B- can be locked using locking pin -3359-. –  Loosen camshaft pulley -B- securing bolts -2-.

–  Turn crankshaft slightly against engine direction of rotation until the pin of the crankshaft stop is positioned just before the hole in the sealing flange -arrow-. –  Now turn crankshaft in engine direction of rotation until crankshaft stop pin engages in sealing flange whilst turning.

–  Apply counterhold -T10172- as shown. Press counterhold -T10172- in direction of arrow keeping camshaft pulley under tension. –  In this position, tighten camshaft pulley securing bolts -arrows- to 25 Nm. –  Remove locking pins -3359- and crankshaft stop -T10050 bzw. T10100-. –  Turn crankshaft at least two rotations in engine direction of rotation and set again to just before TDC No. 1 cylinder. –  Repeat check. –  Install centre and lower parts of toothed belt guard. –  Install belt pulley vibration damper: specified torque 10 Nm + 90° (1/4 turn) further. –  Install lower part of toothed belt guard. –  Install poly V-belt tensioning element: specified torque 25 Nm. –  Install poly V-belt → Chapter. Further assembly is basically the reverse of the dismantling sequence. In the process, note the following: t  Ensure that fuel hose connections are tight. t  Do not interchange supply and return lines (return line blue or with blue markings, supply line black). t  When installing charge air pipes, ensure that locking lugs engage correctly. –  Install wheel housing liner. –  Install noise insulation tray. → General body repairs, exterior; Rep. gr.50.