When setting the crankshaft to the TDC position of the piston of the first cylinder, the marks on the camshafts must align with the marks on the camshaft bearing caps. A necessary condition for the reliability of the results of such a test is the installation of the movable part of the chain tensioner in the working position.
32. Remove the front cylinder head cover (see fig VN 2.048).
VN 2.048
1. Screws for fastening the front cover to the cylinder head
2. Front cylinder head cover
33. Remove the intermediate gear of the fuel injection pump drive (see, figure VN 2.049).
34. Remove the camshafts (1) and camshaft housing (2) (see fig VN 2.050).
VN 2.049
1. Timing chain
2. Exhaust camshaft sprocket
3. Exhaust camshaft sprocket mounting screws
4. Screw for fastening the intermediate gear of the fuel injection pump drive
5. Bushing
6. Intermediate gear of the fuel injection pump drive
7. Pin fixing the position of the inlet camshaft gear
VN 2.050
1. Camshafts
2. Camshaft housing
3. Mounting bushings
Removal
34.1. Remove the cylinder head cover (4) (see figure VN 2.051).
34.2. Set the piston of cylinder number (1) to TDC. The engine should be rotated clockwise by the crankshaft. It is not permissible to rotate the engine by the camshaft, or to rotate it in the opposite direction.
When assembling, align the marks on the camshaft and bearing caps, vibration damper belt pulley (arrow).
34.3. Fix the intake camshaft (1) using the lock (3) (hole A). The holes (B) on the camshaft gears must be located opposite each other.
34.4. Remove the front cover (6) of the cylinder head.
Removal and installation camshafts
VN 2.051
1. Intake valve distribution shaft
2. Exhaust valve camshaft
3. Intake camshaft position lock
4. Cylinder head cover
5. Chain tensioner
6. Front cover
7. Chain guide shoe
8. Chain guide shoe axis
A. Hole for installing the clamp 3
B. Synchronizing holes, which are marks of the relative position of the gear pair of the involute engagement (when the mechanism is installed correctly, they should be aligned)
34.5 Disconnect the chain wheel (11) of the camshaft drive (2) of the exhaust valves and remove it together with the purpose of (see figure VN 2.052). Hold the shaft with a wrench.
34.6. Remove the bearing caps (13) of the camshafts. Loosen the fastening screws (12) of the bearing caps (13) evenly in several passes until the tightening stresses are evenly relieved. The lids are marked.
34.7. Remove the intake (1) and exhaust (2) camshafts.
Installation
34.9. Install the exhaust camshaft (1) and the inlet camshaft (2). Align the marks (B) on the camshaft gears of the pair and the marks on the camshafts with the marks on the bearing caps (see figure VN 2.051).
34.10. Install the camshaft bearing caps (13) (see figure VN 2.052), Install the covers (13) in reverse order, tighten the screws (12) sequentially, turning each screw one turn per pass. The lids are marked (see figure VN 2.053): they are sequentially numbered from front to back, the intake camshaft covers are marked E1-E5 (E1-E6), the exhaust A1-A5 (A1-A6).
VN 2.052
1. Intake distribution valve shaft
2. Exhaust camshaft
9. Screw for fastening the chain wheel to the drive gear of the involute gear transmission synchronizing the camshafts
10. Dowel pin
11. Exhaust camshaft drive chain wheel
12. Camshaft bearing cap screw
13. Camshaft bearing cap
VN 2.053
Tightening torques for threaded connections
Screw for fastening the toothed wheel to the camshaft - 18 Nm.
Bearing cover fastening screw - 9 Nm.
Bolt for fastening the guide to the intake camshaft - 50 Nm.
35. Unscrew the screws (7) (see figure VN 2.044).
36. Loosen the screws (8) (see figure VN 2.044) fastening the cylinder head in the sequence shown in the figure VN 2.054.
VN 2.054
VN 2.055
Removal and installation of the cylinder head
1. Camshaft housing
2. Bushing
3. Fuel line
4. Sealing ring
5. Coolant hose
6. Clamp
7. Fuel filter
8. Screw
9. Coolant hose
10. Clamp
11. Coolant hose
12. Clamp
13. Intermediate sprocket of the fuel injection pump drive
14. Bushing
15. Screw
16. Bushing
17. Screw
18. Turbocharger
19. Turbo fuel supply line
20. Sealing ring
21. Turbo coolant line
22. Screw
23. Hydraulic compensator
37. Remove the cylinder head by lightly tapping with a plastic mallet.
38. Perform installation in reverse order. Before installation, check the suitability of the cylinder head mounting screws for further use (see figure VN 2.056).
Checking the length of the cylinder head mounting screws
VN 2.056
Thread: M12
Length (L) of the new 102 mm
Maximum length (L) 104 mm
The sequence of tightening the cylinder head mounting screws is shown in the figure VN 2.057. The screws should be tightened in this sequence at each of the four stages.
VN 2.057
Tightening torques
Valve cover
VN 2.058
1. Valve cover
2. Valve cover for engines with equipment code (MF4)
3. Figured plate
4. Screw M5
5. Upper panel of the valve cover
6. Oil filler cap
7. Gasket of the oil filler neck cover
8. Valve cover gasket
9. Gasket
10. Valve cover mounting screw
11. Oil separator
12. Gasket
13. Oil separator mounting screw M6x30 mm
14. Sealing ring
15. Sealing ring
16. Oil separator gasket
17. Air duct between pressure regulating valve and air manifold
18. Air duct between pressure regulating valve and air manifold (MF4)