Removal
1. Remove the valve mechanism as described in Chapter 5 of Section 2A.
2. Remove the push rods one by one and stack them in the correct order by pushing them into the cardboard holder.
3. Remove the four nuts securing the rocker cover to the front of the cylinder block, then remove the washers and seals from the cover studs. Carefully use a screwdriver to separate the cover from the cylinder block, and remove it along with the rubber seal.
4. Remove each pusher one by one and place them in a box with labeled compartments (see illustrations).
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5. Remove the drive chain and sprockets as described in Chapter 7 of Section 2A.
6. Before removing the camshaft, check its end play as follows: Temporarily install the distributor drive gear, concave and lock washers, and sprocket bolt onto the end of the camshaft, and tighten the bolt to the specified tightening torque Specifications. Fix the micrometer so that the feeler gauge is parallel to the camshaft axis and rests against its end, measure the axial clearance by moving the camshaft along the axis first in one direction and then in the other until it stops (see illustration). If the axial clearance exceeds that specified in Specifications limit value, replace the camshaft support plate when installing.
7. Remove the temporarily installed components, then remove the three screws securing the camshaft support plate to the cylinder block. Remove the plate and lift the camshaft out of the block (see illustrations).
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Inspection
8. Inspect the tappets for wear and corrosion on the surfaces that contact the camshaft lobes. Insert the tappets one by one into their respective bores in the cylinder block, and check that they move freely up and down and that there is no excessive lateral movement. If you have the necessary tools, determine the wear of the tappets and their seats in the cylinder block (see illustration).
9. If any of the rocker arms is badly worn, the corresponding tappet must also be replaced. If there is excessive lateral movement, or if any of the cylinder block bores are badly worn, the cylinder block bores must be reamed and a tappet of oversize installed. Have this work done by a Skoda dealer.
10. Inspect the camshaft lobes and bearing journals for signs of wear, corrosion, or scratches. If you have the necessary tools, measure the diameter of the camshaft journals (see illustration) and the inside diameter of each bearing in the cylinder block, and compare the results with those given in Specifications data. The bearing operating clearance can be calculated by subtracting the camshaft journal diameter from the diameter of the opening formed by the bearing support surfaces.
11. If the cams or journals are badly worn, replace the camshaft. If the camshaft bearings are excessively worn, consult a Skoda dealer or an engine repair specialist about the possibility of boring the cylinder block and installing camshaft bearing shells. If this is not possible, the block must be replaced.
12. Inspect the camshaft support plate for wear and replace if worn.
Installation
13. Generously lubricate the camshaft lobes and journals with oil, then insert the camshaft into place in the cylinder block.
14. Install the support plate onto the end of the camshaft and tighten the three mounting screws securely. Check the camshaft end play as described in step 6.
15. Install the drive chain and sprockets as described in Chapter 7 of Section 2A.
16. Generously lubricate the outer surfaces of the tappets and insert them into the corresponding seats in the cylinder block. If the old tappets are used, install them strictly in the old places to minimize wear.
17. Inspect the tappet cover seal for damage or contamination and replace if necessary. Check that the mating surfaces of the cover and block are clean and that the seal is seated correctly in the groove in the cover. Position the cover on the cylinder block with the slot in the outer rim of the cover facing down and aligned with the fuel lift pump opening on the cylinder block. Install the seals and flat washers on the cover studs, then install the mounting nuts and tighten them to the specified torque Specifications (see illustrations).
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18. Insert the push rods into their original positions in the cylinder head, making sure that they are correctly positioned on the push rods.
19. Install the valve mechanism and adjust the valve clearances as described in Section 1, finally install the valve cover.