Gas distribution (Discovery 3)

Special tool

Camshaft Alignment Tool 303-1146

TDC/Crankshaft Locking Tool 303-573

Camshaft Bolt Tool 303-575

Camshaft Bolt Head 303-565

Camshaft Locking Tool Adapter 303-576

Camshaft Sprocket Adjustment/Lock Tool 303-597-01

Timing Chain Tensioner Tool 303-571

1. Check the camshaft synchronization.

2. Disconnect the ground cable from the battery. Specification

3. Remove both cylinder head covers.

4. Turn the crankshaft clockwise until one cylinder is at TDC. Make sure the camshaft lobes are at the rear.

5. Lock the crankshaft.

• Install the special tool.
• Tighten the screw.

6. Insert the special tool into the camshaft slot, with the base of the special tool touching the cylinder head. If the special tool can pass from one side of the cylinder head to the other without resistance, the camshaft is adjusted correctly. Repeat the procedure for the other camshaft. If both camshafts are adjusted correctly, no further action is required.





7. If the camshaft is not synchronized correctly, make adjustments. Please note that both camshafts must be re-synchronized with the removed camshaft valve roller tappets.

8. Remove the camshaft roller tappets. Camshaft Roller Tappet (12.29.57)

9. Move the generator to the side to gain access. Remove the 3 bolts.



10. Remove the right cylinder head wiring harness mounting bolt. Move the wiring harness mount to the side to gain access.



11.

CAUTION: Using a centering tool to loosen the camshaft sprocket mounting bolt will result in damage to the crankshaft.

NOTE: The camshaft alignment slot is off-center. A properly adjusted camshaft should have a slot horizontally below the center line.

Install the special tool to adjust the camshaft.

• Clean the contact surfaces of the parts.
• Tighten the bolts to 10 Nm.
• Lock the camshaft and tighten the special tool bolt to 45 Nm.

12. Install the special tool on the right-hand cylinder head.

• Clean the contact surfaces of the parts.
• Tighten the bolts to 10 Nm.
• Tighten the bracket bolts to 10 Nm.

13.

CAUTION: The right camshaft sprocket bolt has a left-hand thread.

Using the special tool, loosen the right camshaft sprocket bolt. Remove and discard the bolts.



14. Loosen the special tool bracket bolts.





15.

CAUTION: Before disconnecting or removing parts, make sure the area around mating surfaces and connections is clean. To prevent contamination of the system, plug all open connections.

Remove the right hydraulic timing chain tensioner.



16. Install the special tool. Clean the contact surfaces of the parts.

[The original article can be found here: LRman.ru]



17. Tighten the bracket bolts to 10 Nm.





18. Using the special tool, tighten the camshaft sprocket bolt to 20 Nm, then another 100 degrees.



19. Remove the special tools.

20. Install the right hydraulic timing chain tensioner.

• Install a new seal.
• Clean the contact surfaces of the parts.
• Tighten the tensioner to 44 Nm.

21.

NOTE: If the position of either camshaft is changed, both camshafts MUST be re-adjusted.

NOTE: The left camshaft sprocket bolt has right-hand threads.

Repeat the above procedure to adjust the left camshaft timing.

22. Install the camshaft roller tappets. Camshaft Roller Tappet (12.29.57)

23.

CAUTION: Tighten the bolts in the sequence shown.

Install the generator.

• Clean the contact surfaces of the parts.
• Tighten the bolts (tightening torque 45 Nm).

24. Connect the ground cable to the battery. Specification