Strona 1 z 10
Checking and setting the valve clearance
Checking and setting the valve clearance
(1) Exhaust valve adjusting screw (4) Lock nut
(2) Lock nut (5) EVB counter-holder lock nut
(3) Intake valve adjusting screw (6) EVB adjusting screw
Technical data
Intake valve clearance 0.5 mm
Exhaust valve clearance 0.8 mm
EVB counter-holder adjustment dimension 0.6 mm
Lock nuts (2), (4) 45 Nm
EVB counter-holder lock nut (5) 45 Nm
Cylinder head cover mounting bolts 10 Nm
Important information
WARNING
Danger of reduced engine output or engine damage
Always adjust the valve clearance whilst the engine is cold
WARNING
Component damage due to incorrectly tightened screw/bolt connections
If impact wrenches are used, these may only be used for pretightening to max. 50 % of the
specified tightening torque
Final tightening must always be performed manually using a torque wrench
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Strona 2 z 10
Special tools
[1] 08.06450-0006 Torque wrench
Adjusting the valve and EVB clearance in conjunction with:
Holding fixture
Feeler gauge leaf 0.5
Feeler gauge leaf 0.6
Feeler gauge leaf 0.8
Valve adjusting spanner, size 14
Valve adjusting spanner, size 21
[2] 08.75300-0000 Holding fixture
Checking and adjusting the valve and EVB clearance in
conjunction with:
Feeler gauge leaf 0.5
Feeler gauge leaf 0.6
Feeler gauge leaf 0.8
Valve adjusting spanner, size 14
Valve adjusting spanner, size 21
Torque wrench
[3] 80.99603-6031 Valve adjusting spanner, size 14
Adjusting the valve clearance in conjunction with:
Holding fixture
Feeler gauge leaf 0.5
Feeler gauge leaf 0.8
Torque wrench
[4] 80.99603-6032 Valve adjusting spanner, size 21
Adjusting the EVB clearance in conjunction with:
Holding fixture
Feeler gauge leaf 0.6
Torque wrench
[5] 80.99607-0177 Feeler gauge leaf 0.5
Checking and adjusting the valve clearance in conjunction
with:
Holding fixture
Valve adjusting spanner, size 14
Torque wrench
[6] 80.99607-0178 Feeler gauge leaf 0.6
Checking and adjusting the EVB clearance in conjunction with:
Holding fixture
Valve adjusting spanner, size 21
Torque wrench
[7] 80.99607-0179 Feeler gauge leaf 0.8
Checking and adjusting the valve clearance in conjunction
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Strona 3 z 10
with:
Holding fixture
Valve adjusting spanner, size 14
Torque wrench
[8] 80.99626-6008 Engine barring gear
Cranking the engine in conjunction with:
Gear ratchet
[9] 80.99627-0001 Gear ratchet
Cranking the engine in conjunction with:
Engine barring gear
Checking and setting the valve clearance
Removing the cable duct cover
Open the locking pin (2) a quarter turn
Remove the cable duct cover (1)
Removing the cylinder head cover
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Strona 4 z 10
Note
The mounting bolts can only be removed from the cylinder head cover with damping elements
and spacer sleeves.
Unscrew the mounting bolts (3)
Remove the cylinder head cover (2) from the cylinder head (1)
Attaching the engine barring gear
Remove the sealing cap from the flywheel housing/timing case
Mount the Engine barring gear (1) on the flywheel housing/timing case
Moving the engine to the adjusting position
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Strona 5 z 10
A Rocker arms in overlap B Rocker arms free
Crank the engine in the engine's running direction using Engine barring gear and Gear ratchet until the
rocker arms are in overlap
Adjust free rocker arms as per table
Checking the intake valve clearance
Insert the Holding fixture (4) with Feeler gauge leaf 0.5 (2) between the ball socket (1) and valve bridge (3)
Adjust the valve clearance if the valve clearance is not 0.5 mm.
Adjusting the intake valve clearance
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Strona 6 z 10
Undo the lock nut (2) and adjusting screw (1)
Insert the Holding fixture (5) with Feeler gauge leaf 0.5 (6) between the ball socket (3) and valve bridge (4)
Screw in the adjusting screw (1) until the Feeler gauge leaf 0.5 (6) can be moved between the ball socket
(3) and the valve bridge (4) with little resistance
Hold the adjusting screw (1) steady with Valve adjusting spanner, size 14
Tighten the lock nut (2) to 45 Nm using Torque wrench
Check the setting again and, if necessary, repeat the setting procedure
Checking the exhaust valve clearance
Push down the valve bridge (2) several times in order to force the engine oil out of the EVB piston (5)
Insert the Holding fixture (3) with Feeler gauge leaf 0.8 (4) between the ball socket (1) and valve bridge (2)
Adjust the valve clearance if the valve clearance is not 0.8 mm.
Moving the EVB piston to the adjusting position
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Strona 7 z 10
WARNING
Danger of incorrect valve clearance
It must be possible to fully push the EVB piston into the valve bridge
Undo the lock nut (2) and unscrew it several turns
Screw in the adjusting screw (1) to press the valve bridge (3) downwards several times until the stop is
reached
All the engine oil must escape from the EVB piston (4).
Adjusting the exhaust valve clearance
Undo the lock nut (3)
Screw in the adjusting screw (2) to press the valve bridge (6) downwards as far as the pressure point
Block the valve bridge (6) in this position with the adjusting screw (1)
Insert the Holding fixture with Feeler gauge leaf 0.8 (5) between the ball socket (4) and valve bridge (6)
Unscrew the adjusting screw (2) until the Feeler gauge leaf 0.8 (5) can be moved between the ball socket
(4) and the valve bridge (6) with little resistance
Hold the adjusting screw (2) steady with Valve adjusting spanner, size 14
Tighten the lock nut (3) to 45 Nm using Torque wrench
Check the setting again and, if necessary, repeat the setting procedure
Checking the adjustment dimension for the EVB piston
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Strona 8 z 10
Lightly push down the valve bridge (1)
Insert the Holding fixture (3) with Feeler gauge leaf 0.6 (2) between the counter-holder (4) and the valve
bridge (1)
Adjust the EVB clearance if the adjustment dimension is not 0.6 mm.
Adjusting the clearance for the EVB piston
Note
The valve bridge must not move the exhaust valve when the adjusting screw is screwed in.
Undo the lock nut (2)
Unscrew the adjusting screw (1) until the Holding fixture (3) can be inserted with Feeler gauge leaf 0.6 (4)
Screw in the adjusting screw (1) with Feeler gauge leaf 0.6 (4) inserted until the valve bridge reaches the
stop – this can be felt by a noticeable increase in force
Hold the adjusting screw (1) steady with Valve adjusting spanner, size 21
Tighten the lock nut (2) to 45 Nm using Torque wrench
Check the setting again and, if necessary, repeat the setting procedure
Removing the engine barring gear
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Strona 9 z 10
Remove the Engine barring gear (1) from the flywheel housing/timing case
Mount the sealing cap on the flywheel housing/timing case
Tightening sequence for cylinder head cover
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Strona 10 z 10
A Intake side B Exhaust side
Stick to the illustrated mounting bolt tightening sequence 1 to 18 in the following work step
Mounting the cylinder head cover
Check the gasket in the cylinder head cover (2) and, if necessary, fit a new one
Fit the cylinder head cover (2) on the cylinder head (1)
Screw in the mounting bolts (3)
Tighten the mounting bolts (3) to 10 Nm in the sequence indicated
Mounting the cable duct cover
Put on the cable duct cover (1)
Close the locking pin (2) a quarter turn
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