Note. The technology for removing and installing the intake camshaft has some differences.
Removing the intake camshaft.
Prepare fixtures «11.9.470», «11.9.472», «11.9.473», «11.9.474», «11.9.475», «11.9.480» And «11.9.490» And «checkout» for laying out parts to be removed according to cylinder numbers (5–8).
Remove left eccentric shaft adjusting motor, ignition coils for cylinders 5–8, left cylinder head cover, unscrew spark plugs from cylinders 5–8 and remove left VANOS adjustment units.
Attention! Very important! First you need to rotate the intake camshaft so that when the support jumper is removed, the intermediate levers do not slip off and damage the camshaft.
Turn the intake camshaft against the direction of rotation so that the inscription (1, fig. 5.96) was turned upwards in the direction of the axis of the 8th cylinder, and its cam (arrow) took up a horizontal position.
Attention! The bearing caps for the camshafts of cylinders 1-4 and 5-8 must not be interchanged.
The inlet camshaft bearing caps on cylinder bank 5-8 are marked «RE1–RE5», readable from the intake side and must not be interchanged.
Unscrew the fastening nuts and remove the bearing cover «RE1». Loosen and remove eight nuts (arrows, fig. 5.97) support jumper fastenings (1), starting with the outer nuts and moving towards the center.
Attention! When removing the support bridge, do not turn it over.
Pusher levers (1, fig. 4.97) divided into classes according to tolerances.
On the intake side, only one tolerance class may be installed per cylinder. Tolerance classes are indicated by numbers from 1 to 4 (see arrow).
The levers of the pushers that were in operation must be installed only in the same places.
After removing the support jumper, the roller levers of the pushers become accessible. Levers (1, fig. 5.98) do not remove the tappets from the intake side.
Clamp fixture «11.9.470» in a vise and carefully remove the support bridge from the cylinder head towards the top. Do not turn over the support bar. Lay the support bar (1) together with the intake camshaft and eccentric shaft, as shown in Figure 5.99, on the fixture «11.9.470». Fix the support jumper with a special nut - tool «11.9.473».
Attention! The lower part of the support bridge is machined together with the cylinder head and therefore cannot be repositioned, it remains on the cylinder head.
If, after removing the intake camshaft, the eccentric shaft must also be removed, then the bolts must be unscrewed (11, see fig. 4.12) and remove the sensor (10) position of the eccentric shaft.
Note. Removing the intermediate levers should begin with the 8th cylinder, and proceed in the same way for cylinders 5-7.
Raise one end of the torsion spring with the tool «11.9.480» and hold it in that position. Remove the intermediate lever towards the top and place in order in «checkout». While still holding the torsion spring, install the guard «11.9.490» (pic. 5.100) at the end of the torsion spring. Support the protected end of the torsion spring on the intake camshaft.
Attention! Intermediate levers (22, see fig. 4.12) divided into tolerance classes, which are indicated by numbers, from 1 to 5. Within the same cylinder head, they can only be installed in one tolerance class.
Used intermediate levers should only be installed in the same places.
The bearing caps for the camshafts of cylinders 1-4 and 5-8 must not be interchanged.
The inlet camshaft of cylinders 5-8 has the designation «EIN 58».
Raise the second end of the torsion spring using the tool «11.9.480» and hold it in that position. Remove the intermediate lever towards the top and place in order in «checkout». While still holding the torsion spring, install the guard «11.9.490» to its other end. Support the protected end of the torsion spring on the intake camshaft.
Remove the screw (1, fig. 5.101) torsion spring mounting (2) and remove it together with the device «11.9.490».
Note. Remove intermediate levers and torsion springs for cylinders 5-7 in the same way and install in order. Bearing caps are marked - «RE2» – «RE5».
Unscrew the special nut - tool «11.9.473», and remove the bearing caps «RE2» – «RE5» (pic. 5.102), put them in order in «checkout».
Hook and remove the intake camshaft, inspect it, if necessary, replace the rectangular rings (1, fig. 5.103), because they break easily. The rings snap into place at the junction. To remove the ring, press it on one side (left arrow) into the groove, and on the other hand pull up (right arrow) and release the latch. Carefully spread the ring and remove it towards the front.
Replace wheel if necessary (8, see fig. 4.12) camshaft position sensor, for which unscrew the bolt (9) and remove the wheel.