Contents: Dismantling ⇩ Installation ⇩
Dismantling
1. Remove and discard the timing belt.
ENGINE KV6 - MODIFICATION K, Piston group, Timing belt.
2. Remove the intake receiver.
MANIFOLDS AND EXHAUST SYSTEM: MOD. K, V6 engine, ENGINE OVERHAUL, Intake manifold seals: vehicles manufactured before May 2003.

3. Unscrew the 4 bolts securing the rear cover of the front timing belt to the left cylinder head and remove the cover.

4. Release the oxygen sensor harness from the clamp on the cylinder block.
5. In the sequence shown in the figure, unscrew the 4 nuts securing the exhaust manifold to the cylinder head. Remove the exhaust manifold and dispose of its gasket.
6. Remove the valve cover of the left cylinder head.
ENGINE KV6 - MODIFICATION K, Left cylinder head camshafts, Left cylinder head valve cover gasket: up to May 2003.

7. Loosen the clamp, disconnect the steam outlet hose from the left intake manifold and move the hose to the side.

8. Press the shoulders and remove the ventilation hose from the left intake manifold.

9. Disconnect the right-hand injector harness either from the injector protective cover (if provided) or from the lugs on the fuel rail.

10. Unscrew the 2 bolts securing the injector protective cover (if provided) and the right fuel rail to the right intake manifold and remove the cover.

11. Unscrew the 2 bolts securing the fuel rail to the left intake manifold.
12. Release the injectors from the manifolds and carefully place the ramp with the injectors aside.
CAUTION: Always plug the fittings and holes to protect the system from dirt.

13. In the sequence shown in the figure, loosen and unscrew the 8 cylinder head mounting bolts.
14. Remove the cylinder head.
CAUTION: Place the cylinder head on wooden blocks.
15. Remove and discard the cylinder head gasket.
CAUTION: Do not rotate the crankshaft with the right cylinder head installed (and timing belt removed).

16. Install the LRT-12-144 fasteners onto the cylinder liners and tighten them with the cylinder head fastening bolts.
CAUTION: The base of the cylinder liner fasteners must not protrude above the cylinder bore.
Installation
1. Wipe the lower surface of the cylinder head.
CAUTION: Use a special cleaning liquid and a plastic scraper.

2. Unscrew the bolts from the LRT-12-144 cylinder liner fasteners and remove the fasteners.
CAUTION: Do not rotate the crankshaft.
3. Clean the top surface of the cylinder block and the holes for the mounting pins.
4. Wash the cylinder head mounting bolts and wipe them dry.
5. Lightly lubricate the threaded portion and bolt heads with clean engine oil.

6. Check that the protrusion of the pins above the plane of the block is within 10-11 mm. Replace the pins if the protrusion does not correspond to the values specified above.
7. Install a new cylinder head gasket onto the cylinder block with the 'TOP' mark facing upwards.
8. With the help of a partner, place the head on the cylinder block and carefully install the left intake manifold onto the right.
9. Carefully insert the cylinder head mounting bolts, DO NOT LOOSE THE BOLTS TO FALL INTO THEIR SOCKETS. Tighten the bolts by hand.

10. Tighten the cylinder head bolts in the sequence shown in the figure.
- Stage 1: 25 Nm
- Stage 2: 25 Nm
- Stage 3: 25 Nm
- Step 4 - Using an angle torque wrench, tighten the bolts in the same sequence an additional 180 degrees.
11. Install the left cylinder head valve cover gasket.
ENGINE KV6 - MODIFICATION K, Left cylinder head camshafts, Left cylinder head valve cover gasket: up to May 2003.
12. Remove the O-rings from the injectors and discard them.
13. Wipe the injectors and their seats in the fuel rail.
14. Lubricate new O-rings with castor oil and install them on the injectors.
15. Install the fuel rail assembly and secure the injectors in the intake manifolds.
16. Install the injector guard (if provided) on the right fuel rail and secure the injector harness to the clips on the protective cover.
17. Screw in the bolts securing the fuel rail to the intake manifold and tighten them. Tightening torque 9 Nm.
18. Connect the cooling system vapor bleed hose to the intake manifold and secure it with a clamp.
19. Connect the ventilation hose to the left intake manifold.
20. Install the ignition coils to the left intake manifold.
21. Install the ground wire, install the harness mounting bolts to the left intake manifold and tighten to 9 Nm.
22. Clean the front timing belt rear cover mounting bolts and apply STC 50552 sealant to the first three threads.
23. Install the rear belt cover, screw in the bolts and tighten them to a torque of 9 Nm.
24. Wipe the exhaust manifold and the mating surface on the cylinder head.

25. Install a new exhaust manifold gasket. Install the exhaust manifold, fit the nuts and tighten them to 45 Nm in the sequence shown in the figure.
26. Secure the oxygen sensor harness to the clamp on the cylinder block.
27. Connect the oxygen sensor connector and secure it to the bracket.
28. Install the new timing belt.
ENGINE KV6 - MODIFICATION K, Piston group, Timing belt.
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