Table of contents: Removal 🠇 Installation 🠇
Removal
Place the vehicle on a two-post lift.
Disconnect the battery.
Drain the engine coolant.
Remove the timing chain.
Caution: Plug the turbocharger heat exchanger inlet and outlet openings with plugs (eP6DT engine), turbocharger inlet and outlet ports (eP6DT engine), the air inlet to the cylinder head.
Remove the camshaft locking device.
Note: Gradually, in a spiral, unscrew the bolts securing the intake and exhaust camshaft bearings so that they move away from their joint plane by a few millimeters. Start with the central bearings.
Mark bearing caps before removal.
Loosen the bolts (1) and remove the camshaft bearing cover (2).
Loosen the bolts (3) and remove the camshaft bearing cover (4).
Gradually loosen the bolts (5) in a spiral pattern (start with the center bearings).
Loosen the bolts (5) and remove the main journal caps (6).
Caution: Protect the sealing rings (8) and (9) from damage.
Remove the intake camshaft (7).
Gradually unscrew the bolts (10) in a spiral pattern (start with the center bearings).
Loosen the bolts (10) and remove the camshaft bearing caps (11).
Remove the exhaust camshaft (12).
If removing the stoppers and hydraulic lifters, mark their position before removal.
Installation
Caution. Do not use abrasive or cutting devices and tools. The surfaces to be joined must not have any signs of impact or cracks. Clean the mating surfaces of the cylinder head covers.
Note: Replace all seals each time.
Caution: Check that there are no impact or scratch marks on the camshaft bearing surfaces, bearings or sealing gaskets.
Check the camshafts (7) and (12), sealing rings (8) and (9), and the camshaft bearing caps (6) and (11).
Clean the surfaces adjacent to the cylinder head and the bearing caps of the shafts.
Remove oil from the threaded holes for mounting the camshaft bearing caps.
Lubricate the edge of the camshaft journals with engine oil.
Lubricate the hydraulic tappet housing (13) with engine oil. Install the hydraulic tappets (13) in place (keep their original location).
Make sure the hydraulic lifters rotate freely in the cylinder head.
Check the presence of springs (14) on the rocker arms (15).
Caution. The spring (14) must not be deformed under any circumstances. Even if it is slightly deformed, there is a risk that the rocker arm (15) will not be held in relation to the hydraulic tappet (13).
Install the rocker arms (15) in place (keep their original location).
Reinstall the camshafts and bearing caps.
Install the camshaft locking device.
Pre-tighten the bolts in a spiral pattern (5) (start with the central bearings) (see chapter "Tightening torques for mechanical parts of petrol and diesel engines").
Tighten the bolts (5) to 10 Nm.
Note: Proceed sequentially from bolt to bolt in the order shown.
Install the timing chain in place.
Remove the plugs.
Fill the cooling system.
Connect the battery.