2. Remove the camshaft sprockets.
3. Reverse order for tightening (see photo below) Loosen the nuts on the intake camshaft bearing journals. Unscrew the nuts evenly and gradually, making 1 turn at a time, until the bolts begin to turn away by hand. The intake camshaft covers are numbered 1 to 5, the exhaust camshaft covers are numbered 6 to 10 (see photo).
Attention! It is not allowed to violate the order of unscrewing the bolts, otherwise the cover may crack due to the uneven effect of the forces of the valve springs. In the event of a broken cover, the cylinder head must be replaced along with all covers. The bearing journal covers are machined together with the camshaft beds in the cylinder head and are not supplied separately as spare parts.
4. Remove the intake camshaft.
5. Remove the exhaust camshaft following the same steps.
6. Remove the hydraulic pushers from the cylinder head by placing them in a separate numbered bag (see photo). Store the hydraulic pusher in such a way that oil does not leak out of it.
7. Check the condition of the beds and camshaft covers. If visible signs of wear are found, replace the cylinder head and camshafts.
8. Check the camshaft runout in the prisms. If the runout is greater than normal, replace the camshaft.
9. Check up a condition of a surface of hydropushers and openings in a head of cylinders. If severe wear is found, replace this pusher.
Installation
10. Lubricate the tappet ends with molybdenum disulphide grease before reassembly and install both camshafts in place so that the cams of the 1st cylinder are facing up (see photo). On the intake camshaft of the 1.8 liter engine there is a C3 marking, and on the exhaust camshaft there is a TK mark (see photo).
11. Temporarily put the camshaft sprockets in place and set the camshafts so that the location of the marks on the sprockets approximately corresponds to TDC. Take off the stars.
12. Lubricate the camshaft covers, install in place (according to the location of the rooms) and progressively tighten the cap bolts in the helical order shown (see photo). First, tighten the bolts until the split planes of the covers and beds come into contact, then tighten the bolts to the specified torque.
13. Follow the steps above for the exhaust camshaft.
14. Install the removed parts in reverse order.
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