28.1 Timing chain installation details
1.5 Bolt, 9 Nm
2 Chain tensioner 12
3 Chain tensioner 12
4, 14 Guide pins, 20 Nm
6 Timing valve, left-hand thread, 35 Nm
7 Bolt, to be replaced, 8 Nm, then retighten 90°
8 Washer
9 Bearing holder
10, 13 Chain guide
11 Camshaft housing
12 Timing chain
15 Crankshaft sprocket, when installed, the protruding edges of the two teeth on the end of the sprocket must be aligned with the beveled edges of the two teeth on the end of the crankshaft
2. Remove the top timing chain cover (see Section 27).
3. Turn out the control valve of the timing phases using the tool T10352 / 1 (for CDAA/CDAB and CCZA engines) or T10352 (for BZB engine), - see resist. illustration.
28.3 Unscrewing the timing control valve
Note: The valve has a left hand thread.
4. Turn out bolts (see resist. illustration) and remove the bearing holder.
28.4 Fastening the bearing holder
5. Using the T10355 key, turn the crankshaft clockwise to the position corresponding to the TDC of piston No. 1. In this case, the notch on the pulley should be opposite the mark on the bottom cover of the timing chain (arrow on resist illustrations), and labels (1) on the camshaft sprockets must point upwards. If the marks on the shafts are not facing up, turn the crankshaft one more turn.
28.5 TDC position of piston #1
6. Remove the lower timing chain cover (see Section 27).
7. Push the oil pump drive chain tensioner in the direction of the arrow (see resist. illustration) and lock the tensioner in this position with pin T40011. Remove the tensioner (1) and the oil pump drive chain from the crankshaft sprocket.
28.7 Removing the oil pump chain
8. Together with an assistant, using a Phillips screwdriver with a diameter of approximately 2 mm, lift the locking element of the timing chain tensioner in the direction of the arrow (1 per resist. illustrations), push the tension bar in the direction of the arrow (2) and secure the tensioner with lock pin T40011.
Note: Do not kink or pry the lock washer (A). If the automatic tensioner reset does not work, a cold start could cause the chain to come off the tooth and cause engine damage.
28.8 Loose timing chain
9. Remove tension bar (2 to resist. illustrations) and guide bar (1) timing chain, and then remove the timing chain. This will move the intake camshaft clockwise.
28.9 Removing the timing chain tensioner
10. Lay the timing chain on the exhaust camshaft and crankshaft sprockets so that its colored links are opposite the marks on the sprockets (see resist. illustration). Invite an assistant, ask him to turn the intake camshaft with an open-end wrench in the direction of the arrow and hold it in this position until the timing chain tensioner and guide rails are installed. Slide the timing chain onto the intake camshaft sprocket so that the mark on the sprocket is opposite the colored chain link. Install the timing chain guide and tighten the bolts (1 in illustration 28.9), then install the tension bar and tighten the bolt (2). The key can now be removed from the intake camshaft.
28.10 Marks on the timing chain and sprockets
11. Install the bearing holder and tighten its fastening bolts by hand (see illustration 28.4). Pull out the T40011 locking pin from the timing chain tensioner and tighten the bearing holder mounting bolts to 9 Nm.
12. Tighten the timing control valve (with left hand thread).
13. Establish the remained details in sequence, return to an order of their removal.