Note. The technology for removing and installing the left exhaust camshaft is different. cook «checkout» for laying out parts to be removed by cylinder numbers.
Removing the exhaust camshaft
Removal of the left exhaust camshaft on the bank of cylinders 5-8 must be carried out in the following order.
Remove left eccentric shaft drive motor, ignition coils for cylinders 5–8, left cylinder head cover, unscrew spark plugs for cylinders 5–8 and left VANOS adjustment units.
Mark the bolts for fastening the chain guide bar, as they are different - M8x50 and M6x70. Remove bar (15, see fig. 5.13) upper chain guide.
Turn the exhaust camshaft by the hexagon so that the cam of the 6th cylinder (arrow, fig. 5.110) stood nose up.
Attention!
- Bearing caps for camshafts 1-4 and 5-8 must not be interchanged.
- The bearing caps of the exhaust camshafts of cylinders 5-8 are marked «RA1–RA5», read from the intake side.
Loosen the nuts (arrows, fig. 5.111) fasteners and remove the bearing cover «RA1». The oil line clamps are mounted on bearing caps 3 and 5.
Loosen bearing cap nuts «RA2–RA5», remove them and the exhaust camshaft.
Inspect intake camshaft, replace rings if necessary (1, see fig. 5.106) rectangular section, because they break easily. Rings (1) rectangular cross-section snap into place at the junction.
To remove the ring, it is necessary to press it on one side into the groove, and on the other hand, pull it up and disengage the retainer. Carefully spread the ring and remove it forward. Replace wheel if necessary (1, fig. 5.112) camshaft position sensor, for which unscrew the bolt (2) and remove the wheel (1) sensor.
Installing the exhaust camshaft
The installation of the left exhaust camshaft on the bank of cylinders 5-8 must be carried out in the following order.
Clean all bearing beds and intake camshaft lobes and lubricate them with engine oil.
The exhaust camshaft has a groove, and the wheel of its position sensor, a ledge for their mutual fixation. Put on the speed sensor wheel and align it with the groove in the camshaft. Insert and tighten bolt (M14x1.5) torque 30 Nm (3.0 kgf·m).
Carefully insert the rectangular rings, as they break easily. Carefully spread the ends of the ring and install it in the groove. Press the end of the rectangular ring into the groove, and on the other hand, hook it with a retainer. They snap into place at the junction.
Pusher levers (1, fig. 5.113) The exhaust camshafts are of the same design as the intake camshaft pushrods. The classification of the tappet arms does not affect the operation of the exhaust camshaft. Pusher levers (1) are easily displaced when installing the exhaust camshaft.
Make sure the lever (1) the pusher is fixed, as shown in Figure 5.113, on the elements of the hydraulic valve clearance compensation system and on the valves.
Used tappet levers can only be used again in the same places. Align the pusher arms in the forward direction. Lubricate the exhaust camshaft and bearing caps with engine oil.
Insert exhaust camshaft (1, fig. 5.114) into the cylinder head.
Rotate the exhaust camshaft so that the cam of cylinder 6 is pointing up. Check centering sleeves (2, fig. 5.115) for damage and correct installation. Ring ends (1) rectangular section, their locks should be directed upwards. Make sure the ends of the rings snap into place.
The exhaust camshaft bearing caps on cylinder bank 5-8 are marked «RA1–RA5» (pic. 5.116), read from the intake side. Install bearing caps «RA2–RA5». The oil line clamps are mounted on bearing caps 3 and 5.
Install the nuts and tighten them by hand until tight. Tighten nuts evenly (M7) bearing caps «RA2–RA5», in several steps of half a turn, from the middle to the edges, with a final torque of 14 Nm (1.4 kgf·m).
Install the bearing cover «RA1» so that its marking is read from the intake side. Install the nuts securing the cover and tighten them to a torque of 14 Nm (1.4 kgf·m).
Replace seal (16, fig. 5.13) between the cylinder head and the chain guide bar.
Set the bar (15, see fig. 5.13) chain guide with a new seal, insert and tighten the bolts (15, 16), which differ from each other.
Turn the exhaust camshaft against the direction of its rotation so that the cam of the 5th cylinder is tilted upwards, as shown in Figure 5.117 (arrow).
Install the left-hand intake and exhaust VANOS control units, screw in the spark plugs for cylinders 5-8, install the cover for the left-hand cylinder head and the ignition coils for cylinders 5-8. Assemble the engine.