Attention! When reusing the timing chain, the direction of its movement should be noted.
When installing, the charge air hoses must be dry and free from oil.
Protect the generator from contamination.
Remove the engine, oil pan, engine cylinder head, vibration damper and coolant pump. Replace the front crankshaft oil seal and remove the timing block.
Unscrew the bolts securing the timing cover and coolant pump (14 pcs., arrows, fig. 6.50) and carefully remove the timing cover.
Mark the direction of movement of the camshaft timing chain and remove it. Press down on the lower tensioner (1, fig. 6.51) and block the chain tensioner using the tool «11.3.340». Loosen the nut (2), and remove the bar (3) chain tensioner from the hinge pin. Loosen the bolt and remove the chain guide (4).
Mark the direction of movement of the high pressure pump drive chain (NVD). Install a tool of the type «13.5.191» and, turning its bolt, remove the low pressure drive sprocket with the drive chain. Remove both timing chain sprockets with chain.
Check the technical condition of the centering sleeves (bottom arrows), if necessary, replace them. Remove seal and clean sealing surfaces.
The installation of the front timing cover should be carried out in the reverse order, while taking into account the direction of movement of the drive chains of the camshafts and HPP.
A new gasket should be installed dry, in one piece, without crushing or bending it. When repairing the timing cover, it is necessary to cut the sealing gasket of the cover.
Before installing the front timing cover, the drive chains must be installed. Apply a thin layer of sealant at the end points of the gasket, on the right and left sides «Drei-Bond-1209». When installing, an arbitrary position of the drive sprocket relative to HP is allowed.
Install timing cover (see fig. 6.50), insert all bolts (М7х38) and pre-wrap them with a torque of 5.0 Nm (0.5 kgf·m). Tighten all bolts in a cross pattern, moving from the center to the periphery, with a final torque of 15 Nm (1.5 kgf·m).
Install new bolts (M10) vibration damper mountings and tighten them. Nut (M14x1.5) fastenings of an asterisk of a drive of HP to tighten the moment of 65 Nm (6.5 kgf·m)
Note. The front crankshaft oil seal, due to its exact fixation to the engine crankshaft, should only be replaced after the cylinder head and engine oil pan have been installed. Failure to follow this sequence of steps results in oil leakage at that location.
Install the cylinder head and oil pan. Replace front crankshaft oil seal and assemble engine.