Timing Chain: Service and Repair

Replacing and Riveting Timing Chain





Preparation
- Cylinder head (valve) covers removed.Service and Repair
- Viscous fan clutch removed, refer to cooling System.
- Spark plugs removed.

Overview
- Set piston of cylinder 1 to 45° before ignition TDC.
- Fix right cylinder head inlet, exhaust camshafts with pins, special tool 111 589 01 15 00 (01), Fig. A.
- Remove chain tensioner. Service and Repair.
- Remove right guide rail (2) at top, install (Fig. A). Service and Repair
- Lock timing chain to camshaft sprockets with wedges, special tool 110 589 03 59 00 (04) and (05), at right cylinder head (Fig. B).
- Cover chain housing cover with clean shop towels to prevent debris from falling into engine.
- Grind chain pin of timing chain (4) between inlet and exhaust camshaft sprockets open (Fig. C),
- Pry plate (8) of timing chain (4) off with a screwdriver (Fig. D).
- Push out ground-open double link.
- Connect new timing chain (5) to old timing chain (4) with riveted link (6) and middle plate (7) (thickness 1.6 mm) and ground open outer plate (8).
- Remove pins (01).
- Remove wedge (5) at inlet camshaft
Hold timing chain meshed at inlet and exhaust camshaft sprockets by hand when performing this step.
- Slacken wedge (04) at exhaust camshaft sprocket slightly.
- Rotate crankshaft in direction of rotation of engine with wrench socket (10); hold timing chain (4) or (5) meshed at inlet and exhaust camshaft sprockets when performing this step.

CAUTION: Ensure that timing chain (4) or (5) does not jump off when turned.

- Pull in new timing chain (5).
- Pull out end (4) of old timing chain which has become free from chain housing.
- Rotate crankshaft until the ends of the new timing chain (5) can be connected with the riveted link.
- Fix new timing chain to camshaft sprockets with wedges (04) and (05).
- Connect ends of new timing chain (6) with link (6) and center plate (7).





- Insert jaws for duplex roller chain with number 1 into fitting tool and screw on with screw (28) (Fig. E).
- Insert moving thrust piece (arrow) for simplex roller chain with number 2 into fitting tool (Fig. F).
- Insert outer plate (8) (thickness 1.2 mm) into moving thrust piece (Fig. G).
- Fit webs (arrows) onto roller at riveted link.
- Screw in spindle (06) until tight resistance is felt.

NOTE: When screwing in, ensure that the pins of the riveted link are inserted into the holes of the outer plate (8).

- Remove insertion tool.





- Turn over moving thrust piece (arrow) with number 2 (riveted section) (Fig. 1).
- Position fitting tool exactly over center of pin (Fig. J).
- Tighten spindle (06) to: 30 Nm (Fig. J).
- Rivet pins of riveted link (6) individually (Fig. J).
- Examine riveting (arrows), re-rivet if necessary (Fig. K).
- Set basic position of camshafts, refer to Set Basic Camshaft Timing. Testing and Inspection
- Install chain tensioner.
- Check basic position of camshafts.