Installing all pistons with connecting rod

NOTE: The description is for one component only. The procedure is identical for all further components.

Installing piston with connecting rod

NOTE: RISK OF DAMAGE
Damage on the cylinder wall and oil spray nozzles.
Major force can scratch the cylinder wall and bend the oil spray nozzles.

Carefully move the piston and connecting rod in the engine block.

Aligning piston rings

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12 o'clock position

4 o'clock position

8 o'clock position

Axis of gudgeon pin

Upper piston ring

Middle piston ring

Lower oil scraper ring

Spring

Upper oil scraper ring

Align the contact points of all piston rings by 120° each.
The piston ring gaps must not be positioned in line with the axis of the gudgeon pin (A).

Piston ring	Alignment
Lower oil scraper ring (O3)	12 o'clock position (1)
Spring (O2)	4 o'clock position (2)
Upper oil scraper ring (O1)	8 o'clock position (3)
Central piston ring (K2)	12 o'clock position (1)
Upper piston ring (K1)	4 o'clock position (2)

Make sure that the spring (O2) does not overlap the piston ring gap (1).

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Coat the pistons (1) and piston rings lightly with oil.
Insert the pistons (1) with the piston rings into the bush 0 495 373 (11 6 240) .
Screw special tool 0 496 144 (11 8 860) on at large connecting rod eye (2).

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Align the piston so that the arrow (1) points to cylinder 1.
Insert the piston with the connecting rod into the special tool 0 495 373 (11 6 240) and guide it into the cylinder.

NOTE: RISK OF DAMAGE
Damage on the cylinder wall and oil spray nozzles.
Major force can scratch the cylinder wall and bend the oil spray nozzles.

Carefully move the piston and connecting rod in the engine block.

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Push in piston by hand with only little force. Do not use striking tools.
Install the lower connecting rod bearing
Vacuum the connecting rod bearing shell and cracked surface (1) with a vacuum cleaner (2).

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Insert the connecting rod bearing shell (1) into the connecting rod bearing cap (2).
Apply a light coat of oil to the connecting rod bearing shell (1).

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If necessary, screw the assembly tool 0 496 144 (11 8 860) into the large connecting rod eye.
Pull the connecting rod up to the connecting rod bearing journal.

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NOTE: RISK OF DAMAGE
Engine damage caused by incorrectly installed bearing shells and bearing supports.
Engine damage may result from incorrectly installing bearing shells and bearing supports.

Always install all bearing shells and bearing supports in the same position from which they were removed.

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Attach the connecting rod bearing caps to the connecting rod until the designations (1) match.
Make sure that the connecting rod bearing (2) is attached to the same connecting rod that it was detached from.
A mixed installation of connecting rod bolts (A) and (B) on a connecting rod bearing cap is not permitted.

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NOTE: TECHNICAL INFORMATION
When installing new connecting rod bolts, ensure that two identical connecting rod bolts are used on one connecting rod bearing cap.
A mixed installation of different connecting rod bolts on one connecting rod bearing cap is not permitted.

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Replace screws (1).
Tighten the screws.
Make sure that the connecting rod bearing cap (2) rests completely on the connecting rod.

TIGHTENING TORQUES SPECIFICATION

Connecting rod bearing cap to connecting rod
Replace screws. Tighten screws crosswise.	Jointing torque	20 Nm
	1. Angle of rotation	70°
	2. Angle of rotation	70°

Follow-up Work

Refer to INSTALLING THE OIL DEFLECTOR
Refer to PREPARING THE OIL VACUUM PUMP .
Refer to INSTALL THE OIL VACUUM PUMP .
Refer to REFITTING SUMP .
Refer to INSTALL BEARING SUPPORT
Refer to INSTALL FRONT AXLE DIFFERENTIAL
Refer to INSTALLING THE FLYWHEEL .
Refer to INSTALLING THE ACOUSTIC COVER FOR THE OIL SUMP .
Refer to BLOCKING THE CRANKSHAFT IN THE TDC FIRING POSITION OF CYLINDER 1 .
Refer to SEAL THE OIL DUCT .
Refer to CLEAN SEALING SURFACES .
Refer to REPLACE CYLINDER HEAD GASKET .
Refer to INSTALLING THE CYLINDER HEAD .
Refer to ADJUST THE CAMSHAFTS WITH THE SPECIAL TOOL .
Refer to INSTALL EXHAUST CAMSHAFT ADJUSTER .
Refer to INSTALLING THE INTAKE ADJUSTER .
Refer to INSTALL THE VANOS CENTRAL VALVE OF THE INTAKE ADJUSTER .
Refer to INSTALLING THE VANOS CENTRAL VALVE OF THE EXHAUST CAMSHAFT ADJUSTER .
Refer to PRETENSION THE TIMING CHAIN WITH THE SPECIAL TOOL .
Refer to TIGHTENING THE VANOS CENTRAL VALVE OF THE EXHAUST CAMSHAFT ADJUSTER .
Refer to TIGHTENING THE VANOS CENTRAL VALVE OF THE INTAKE ADJUSTER .
Refer to DISASSEMBLING ALL SPECIAL TOOLS
Refer to INSTALL CHAIN TENSIONER .
Refer to CHECKING THE TIMINGS OF THE CAMSHAFT .
Refer to INSTALLING THE OIL RETURN LINE FOR THE EXHAUST TURBOCHARGER .
Refer to INSTALL THE COOLANT RETURN LINE FOR THE EXHAUST TURBOCHARGER .
Refer to INSTALLING COOLANT FEED LINE FOR EXHAUST TURBOCHARGER .
Refer to INSTALL THE HEAT SHIELD ON THE CYLINDER HEAD
Refer to INSTALLING CYLINDER HEAD COVER .
Refer to INSTALLING BOTH ACTUATORS .
Refer to PREPARE THE INJECTORS FOR INSTALLATION .
Refer to INSTALLING THE RAIL WITH INJECTORS .
Refer to INSTALLING THE HIGH PRESSURE PUMP .
Refer to INSTALLING HIGH PRESSURE LINE BETWEEN RAIL AND HIGH PRESSURE PUMP .
Refer to INSTALLING ALL SPARK PLUGS .
Refer to INSTALLING THE INTAKE PLENUM .
Refer to INSTALLING THE TANK VENT VALVE .
Refer to TOPPING UP THE ENGINE OIL .
Refer to CHECK/ADD FRONT AXLE TRANSMISSION OIL .
Refer to REMOVING THE ENGINE FROM THE ASSEMBLY STAND
Refer to INSTALL ENGINE .