Toothed Belt, Removing and Installing
Toothed belt, removing and installing
Special tools, testers and auxiliary items required
Pin wrench T10020:
Drift T40098:
Removing
- Remove engine cover - arrows -.
CAUTION: Cover cap of expansion tank with rag and open carefully, as hot steam or hot coolant may escape when opening.
- Open cap of coolant expansion tank.
- For vehicles with auxiliary heater, remove bolts - arrows - for exhaust pipe of parking heater/auxiliary heater on sound insulation.
- Loosen quick-release fasteners - 1 - and - 2 - and remove front sound insulation.
- Drain engine coolant Cooling system, draining and filling
- Bring lock carrier into service position Lock carrier, moving to service position.
- Disconnect coolant pipe - arrow -.
Note: Before removing ribbed belt, mark the turning direction on it with chalk or a felt tip pen. A reversed turning of direction can cause damage to the belt under operating conditions.
- Mark direction of rotation of ribbed belt.
- Pivot belt tensioner for ribbed belt in direction of - arrow - to relieve tension on ribbed belt.
- Secure tensioning element using drift T40098.
- Remove ribbed belt.
- Set camshaft gear to marking for TDC by turning crankshaft. The marking on the camshaft sprocket must align with the arrow on the toothed belt cover.
- Remove vibration damper/belt pulley.
- Remove bolts from lower toothed belt cover - arrows -.
- Remove remaining bolts from toothed belt cover - arrows - and remove toothed belt cover from engine.
- Mark direction of rotation of toothed belt.
- Loosen tensioning roller and remove toothed belt.
- Turn crankshaft back slightly.
Installing
Note:
^ When turning camshaft, crankshaft must not be at TDC. Valves and/or pistons may be damaged.
^ The engine must be no more than warm to touch.
- Place toothed belt onto crankshaft sprocket (observe direction of rotation).
- Secure lower toothed belt cover with two lower bolts.
- Install vibration damper/belt pulley with new bolts. Torque specification: 10 Nm plus an additional 90° 1/4 turn
- Set crankshaft and camshaft to TDC at cylinder 1 - arrows -.
- Route toothed belt in sequence: Tensioning roller, camshaft gear, coolant pump and last over relay pulley - arrow -.
Note: Be sure tensioning roller is properly seated in cylinder head.
- Tension toothed belt. Do this by turning hex key at eccentric toward right (in direction of - arrow -) until notch is positioned above tab.
- Release tension on toothed belt again.
- Tension toothed belt until notch and tab align.
- Tighten tensioning roller nut.
- Turn crankshaft 2 revolutions further in direction of engine rotation until engine is positioned at TDC again. For this it is necessary that the last 45° (1/8 rotation) is turned without interruption.
- Check tension of toothed belt again. Specification: Tab and notch align.
- Check valve timing again.
If markings do not match:
- Repeat valve timing adjustment.
If markings match:
- Install toothed belt guard - arrows -.
- Install crankshaft belt pulley.
- Install ribbed belt.
- Fill with coolant.
- Install lock carrier with attachments.
- Place torque support stop onto rubber buffer for torque support under its own weight and tighten nuts - arrows -.
- Install front bumper cover.
- Check headlight adjustment.
- Install sound insulation pan.
- Install the engine cover.
Torque specifications
