Close the generator from contamination. Remove system heat exchanger «AGR». Loosen the bolts securing the lifting eyes and remove them. Loosen the screws and remove the return tube.
Using fixture «11.6.480» (pic. 6.73) and turning the engine shaft clockwise, set the piston of the first cylinder to the TDC position of the end of the compression stroke. Remove the plug on the crankcase, located below the starter. Using fixture «11.2.300», block the engine crankshaft.
Check the position of the valve drive cams of the first cylinder, their tops (arrows, fig. 6.74) should point to the right when looking in the direction of travel.
Unscrew the screw plug (M30x1.0) and loosen the bolt (1, fig. 6.75) hydraulic chain tensioner to relieve oil pressure.
Note. Before removing the camshaft drive sprocket, be sure to block the tensioner.
Using a wrench mounted on a hex (2, fig. 6.76), slowly and carefully turn the intake camshaft (E) in the direction of engine rotation until the hydraulic chain tensioner is fully compressed.
Insert fixture «11.3.340» into the tensioner (arrow, see fig. 6.75) chain and block it. Screws indicated by «!» do not twist (pic. 6.77).
Remove screws (1 and 6, fig. 6.78). When loosening screws (6) And (3) fastening the camshafts, hold the camshafts from turning by the hexagon. Remove gear (7).
Remove bolts (3 and 8, see fig. 6.7) and remove the intake camshaft sprocket. Push down the bar (9) chain tensioner. Move to the side of the asterisk (1) with a drive chain (1). Take out the guide (6) chains upward. Remove bar (9) tensioner upwards. Set aside the drive chain (1) and fix it with a bracket to prevent it from slipping. Remove gear (2) intake camshaft drive.
Evenly, in several steps, half a turn, loosen and unscrew the bolts (1, fig. 6.79) fastening the camshaft bearing caps, moving from the edges to the middle.
Remove the intake and exhaust camshafts and carefully set them aside on a stand.
Note. Used tappet levers can only be used with reference to the camshaft lobes.
One by one remove the growling pushrods (pic. 6.80) and check their rollers for ease of movement. The intake camshafts are marked «E», exhaust valves - «A».
Installation of camshafts must be carried out in the following order.
Check the technical condition of the camshafts and their covers, lay the shafts. bearing caps (pic. 6.81) intake camshafts are marked «E1–E7», starting from the exhaust side and the timing cover. The exhaust camshaft bearing caps are marked «A1–A7», starting from the exhaust side and the timing cover. Install bearing caps.
Align the intake and exhaust camshafts so that both camshafts have the tops of the cams (arrows, see fig. 6.74) The 1st cylinder was pointed to the right when viewed in the direction of travel.
Attention! Due to the risk of damage to the camshafts, tighten the bearing caps evenly.
Evenly, in several steps, half a turn, screw in all the bolts (1, see fig. 6.79) fastening the camshaft bearing caps, moving from the middle to the edges. The final tightening torque of the M8 bolts is 20 Nm (2.0 kgf·m).
Install gear (1, fig. 6.82) and block the intake camshaft in the position of the first cylinder at TDC of the end of the compression stroke, using tools «11.6.321» And «11.6.322». Insert plank (4) tensioner. Set asterisk (5). Insert Guide (2) chains. Replace screws (3) And (6). Tighten the new screw by hand (6). Loosen it half a turn.
Install gear (1, fig. 6.83) and block the exhaust camshaft in the position of the first cylinder at TDC of the end of the compression stroke, using tools «11.6.321» And «11.6.322».
Tighten the new screw by hand (2) and loosen it half a turn of the screw. Remove Fixture «11.3.340» and tighten screw M6 (1, see fig. 6.75) hydraulic tensioner. Replace the sealing ring, insert the M30x1.0 screw plug and tighten it to 70 Nm (7.0 kgf·m). Install fixture «11.6.320» (pic. 6.84) to the exhaust camshaft.
Note. When tightening the sprocket bolts, keep the camshafts from turning by the hexagon.
Using fixture «00.9.120», tighten the new exhaust camshaft sprocket bolt to 20 Nm (2.0 kgf·m) and tighten by 50°. Install fixture «11.6.320» on the intake camshaft.
Using fixture «00.9.120», tighten the new intake camshaft sprocket bolt to 20 Nm (2.0 kgf·m) and tighten by 50°. Remove fixtures «11.6.320» And «11.2.300».
Using fixture «11.6.480», rotate the motor shaft two full turns (720°) in the direction of rotation until the first cylinder is in the TDC position of the end of the compression stroke (see fig. 6.74).
Check camshaft adjustment.
Install fixtures «11.6.321» And «11.6.322» on the camshaft (1, fig. 6.85) intake valves. fixture «11.6.321» must fit snugly against the cylinder head.
Install fixtures «11.6.321» And «11.6.322» to the exhaust camshaft. fixture «11.6.321» must fit snugly against the cylinder head. Remove all attachments and assemble the engine.