Remove the cylinder head cover (see "Adjustment of thermal clearances in the engine valve mechanism")
Disconnect the block of the engine management system wiring harness from the phase sensor and the coolant temperature sensor.
Using a 10 wrench, we unscrew two nuts 1 and one bolt 2 securing the cylinder head plug.
There is a rubber o-ring under the head of the bolt.
Remove the cylinder head plug together with the sensor.
A rubber sealing ring is installed in the groove of the plug flange.
Remove the camshaft pulley.
Using a 1Z wrench, evenly in several stages (until the pressure of the valve springs is relieved), we unscrew ten nuts securing the camshaft bearing housings.
Remove both camshaft bearing housings from the studs
Slightly moving the rear cover of the timing belt away from the cylinder head, remove the camshaft.
Remove the oil seal from the toe of the camshaft.
Install the camshaft in the following sequence.
We clean the mating surfaces of the cylinder head and bearing housings from old sealant and oil.
Lubricate the bearing journals and camshaft cams with engine oil.
We put the shaft in the cylinder head supports so that the cams of the first cylinder are directed upwards (see Fig. 8).
In this case, the pistons of the 1st and 4th cylinders must be at TDC.
We apply a thin layer of silicone sealant to the surfaces of the cylinder head mating with the bearing housings in the area of the extreme supports (see Fig. 9).
We install the bearing housings and tighten the nuts for their fastening in two steps.
Pre-tighten the nuts in the sequence shown in fig. 10 until the surfaces of the bearing housings touch the cylinder head.
In this case, it is necessary to ensure that the mounting sleeves of the housings fit freely into their sockets.
Final o tighten the nuts to a torque of 21–25 Nm in the same sequence.
After tightening the nuts, carefully remove the remnants of the sealant squeezed out of the gaps.
Check the clearances in the valve mechanism. We press in a new camshaft oil seal.
Further assembly is carried out in the reverse order.