Removal
1. Remove the timing belt. Before removing the belt, turn the crankshaft approximately 60° back. This reduces the likelihood of the valves touching the pistons.
2. Remove the camshaft sprockets.
3. Loosen and remove the intake camshaft bearing cap bolts. Loosen the bolts one at a time, one-half turn at a time. Remove the bolts and caps. All caps are numbered to ensure proper installation during assembly.
4. Remove the intake camshaft.
5. Remove the exhaust camshaft in the same way.
6. Remove the pushers and place them in separate numbered boxes.
Examination
1. Inspect the cams and journals of the shaft bearings for wear and damage, if necessary, replace the shaft. Inspect the shaft bearings in the cylinder head, if they are also worn, replace the cylinder head.
2. Inspect the tappets for wear or damage. Replace if necessary.
Installation
Places to apply sealant
Apply sealant to the shaded areas (indicated by arrows).
Camshaft Bearing Cap Bolt Tightening Sequence
Original source is on the website www.OPELBOOK.ru
1. Lubricate the tappets and tappet bores with clean engine oil and install the tappets in their positions.
2. Check that the crankshaft is still turned approximately 60° rearward.
3. Lubricate the cams and journals of the shaft bearings with clean engine oil. Install the camshafts in the cylinder head. Install the bearing caps.
4. Apply sealant N15 03 170 to the cylinder head surface around the front camshaft bearing caps and into the semicircular cutouts in the rear of the head (see illustration Places to apply sealant).
5. Tighten the intake camshaft cap nuts in the sequence shown in several steps. Tighten the caps very carefully, half a turn at a time (see figure Camshaft Bearing Cap Bolt Tightening Sequence).
6. Tighten the exhaust camshaft cover nuts in the same manner.
7. Install new shaft seals.
8. Install the shaft sprockets and remaining parts.
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