1. Loosen the fastening screw and disconnect the heating nipple from the carburetor. If the screw cannot be loosened, loosen the clamp and remove the hose from the nipple.
2. Unscrew the four carburetor mounting nuts (two of them are located on the opposite side).
3. Remove the carburetor from the intake manifold.
4. Carefully remove the carburetor gaskets.
5. Unscrew the two nuts securing the carburetor heat-insulating shield.
6. Loosen the nut on the fitting.
7. Remove the heat-insulating shield.
8. Unscrew the two nuts securing the warm air intake pipe.
9. Loosen the eye mounting nut.
10. Remove the eye and the warm air intake pipe.
11. Remove the nine nuts securing the intake pipe and exhaust manifold.
12. Remove the exhaust manifold.
13. Remove the intake pipe.
14. Remove two gaskets (see note).
Note: Remove the sealing gaskets carefully. If the gaskets are not damaged and not too compressed, they can be reused. Carefully separate the burnt gaskets with a screwdriver.
Note: After removing the exhaust manifold and intake pipe, place wooden shims under the cylinder head to avoid damaging the valves protruding from the cylinder head.
15. Remove the spark plugs.
16. Remove the coolant temperature sensor.
17. Unscrew the oil pressure warning light sensor.
18. Remove the ten nuts securing both camshaft bearing housings.
19. Remove both camshaft bearing housings from the cylinder head.
20. Remove the camshaft.
Warning: When removing each tappet, mark it and the adjusting washer with a serial number so that they can be installed in their proper place during assembly.
21. Remove the oil seal from the front end of the camshaft.
22. Loosen the tension roller mounting nut.
23. Remove the tension roller and the thrust washer installed underneath it.
24. Remove the valve lifters together with the adjusting washers.
Valve drive parts: 1 – exhaust valve; 2 – inlet valve; 3 – outer spring; 4 – internal spring; 5 – spring plate; 6 – crackers; 7 – spring support washer
25. Mark the valves with the cylinder number so that they can be installed in their proper places during assembly. The marking can be applied using a punch as close to the center of the valve as possible: the valves of the first cylinder - one dot, the second - two, etc.
26. Place a suitable stop under the valve to be removed.
27. Install a valve spring compressor on the head. Compress the valve springs with it and remove the crackers. Gradually loosen the pressure on the handle of the compressor, completely release the valve spring and remove the compressor from the head.
28. Remove the outer spring with the plate.
29. Remove the inner spring.
30. Remove the valve from the cylinder head.
31. Carefully remove the valve stem seal without damaging the valve guide.
32. Remove the valve spring support washer (plate). Remove the remaining valves in the same manner.