2. Remove the spark plugs.
3. Set the piston of the 1st cylinder to TDC of the compression stroke.
4. Mark the chain and camshaft sprocket. If the head is not to be removed, the relative position of these parts must not be disturbed.
5. Prepare a wooden wedge with dimensions 250x19 mm and a width of 30-37 mm on one side and 25 mm on the other.
6. Remove the plug and unscrew the sprocket bolt, remove the fuel pump drive cam (photo).
7. Unwedge the chain by inserting the wedge with the tapered part downwards. The chain must not come off the crankshaft gear.
8. Carefully remove the sprocket, holding the chain, which should remain on the wedge (photo).
9. Remove the shafts with rocker arms.
10. Remove the camshaft, paying attention to the orientation of the pin on the end.
11. Check the condition of the camshaft (see below).
12. Install the camshaft without disturbing the original orientation of the pin. Pre-lubricate the bearings and journals of the shaft (photo).
13. Install the rocker shafts. Tighten the bolts by hand. Tighten the two middle bolts to 17 N·m.
14. Put the chain on the sprocket, carefully removing it from the wedge and put the sprocket on the camshaft. The pin should go into the second recess of the sprocket, and the marks made before disassembly should match up.
15. Remove the wedge and tighten the bolt, install the fuel pump drive cam. Tighten the bolt to the specified torque. Lubricate the plug with sealant and install it in the cylinder head.
16. Tighten the rocker arm shaft bolts to the specified torque.
17. Adjust the valves.
18. Install the cover.
19. Warm up the engine and adjust the clearances again taking into account the standards for a warm engine.
7.6 Loosening the camshaft sprocket bolt
7.8 Fixing the chain with a wedge
7.12 Before installation, lubricate the camshaft journals