Installing piston with connecting rod

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NOTE: TECHNICAL INFORMATION
Piston, piston pin, connecting rod and connecting rod bearing shells are matched to each other and balanced.
Always install the pistons, piston pins, connecting rods and connecting rod bearing shells in the cylinder from which they were removed.

NOTE: TECHNICAL INFORMATION
The work must be performed with vehicle care to prevent component damage.

NOTE: The description is provided only at one component. The procedure is the same for all other components.

Aligning piston rings

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Align the contact points of all piston rings rotated by 120° each.

Do not position contact points over axis of piston 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 contact point on the oil scraper ring does not overlap.

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Permitted combinations of connecting rod bearing shells (1) with N63T3:
- Red - Blue
- Green - Yellow
Permitted combinations of connecting rod bearing shells (1) with S63T4:
- Green - Brown
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Insert the connecting rod bearing shell (1) into the connecting rod bearing cap and secure it with the retaining lugs (arrows).

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Insert the connecting rod bearing shell (1) into the connecting rod and secure it with the retaining lugs (arrows).

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NOTE: TECHNICAL INFORMATION
Maintain conditions of absolute cleanliness.

Do not clean the crack surfaces (1) with compressed air.
Before assembling new connecting rods, vacuum them off in the arrow direction using a commercial vacuum cleaner (2) .

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Screw special tools 2 249 164 into the thread in the area (1) of the connecting rod.

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NOTE: TECHNICAL INFORMATION
The work must be performed with vehicle care to prevent component damage.

The connecting rod and connecting rod bearing cap are identified by the same matching letters (1) and must not be mixed up.

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

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

Position the piston (1) and connecting rod at the crankcase.

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Arrows (1) on the piston and connecting rod bearing cap must point in the driving direction toward the timing chain drive (2) .

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

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

Press special tool 0 494 310 (11 7 280) (2) far enough together that the piston (1) can be installed in the crankcase.
The piston rings must not snag!
Rotate crankshaft at central bolt if necessary.

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Remove special tools 2 249 164 .

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Position the crankshaft (2) .

NOTE: TECHNICAL INFORMATION
The work must be performed with vehicle care to prevent component damage.

Install the connecting rod bearing cap in such a way that the matching letters (3) are on the same side.
Tighten connecting rod bolt using special tool 0 490 504 (00 9 120) .

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TIGHTENING TORQUE SPECIFICATIONS

Connecting rod bolts, for new connecting rod
M9x1.25 Screw. Suction off crack surfaces.	1. Tightening torque	6 Nm
	2. Tightening torque	20 Nm
	3. Tightening torque	30 Nm
	4. Angle of rotation	75°

TIGHTENING TORQUE SPECIFICATIONS

Screw connection, for new connecting rod bolts only
M9x1.25 Replace screws. Suction off crack surfaces.	1. Tightening torque	6 Nm
	2. Tightening torque	20 Nm
	3. Tightening torque	30 Nm
	4. Angle of rotation	75°
	5. Unscrew all bolts.	180°
	6. Tightening torque	5 Nm
	7. Tightening torque	20 Nm
	8. Tightening torque	30 Nm
	9. Angle of rotation	75°
	10. Unscrew all bolts.	180°
	11. Tightening torque	5 Nm
	12. Tightening torque	20 Nm
	13. Tightening torque	30 Nm
	14. Angle of rotation	75°