Overview - Piston And Connecting Rod

WARNING: This page is about a different car, the 2015 Audi S7, 2015 Audi RS 7, 2014 Audi S7, 2014 Audi RS 7, and 2013 Audi S7. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Oil injector jet for piston cooling, refer to Fig 5.

Fig 1: Exploded View Of Piston And Connecting Rod

Courtesy of AUDI OF AMERICA, LLC

Bolts
- 50 Nm +90°
- Replacing
- Use old bolts to measure radial play.
- Lubricate the thread and contact surface.
Connecting Rod Bearing Cap
- Mark for installation later
- Use color to identify the cylinder and connecting rod to which it belongs, refer to Fig 3
- Installation position of connecting rod pairs, refer to Fig 4
Bearing Shells
- Make sure the tabs are tight
- Replace any worn bearing shells
- Over-sized bearings are available for reworked crankshaft connecting rod journals .
Connecting Rod
- Always replace as a set.
- Use color to identify the cylinder and connecting rod bearing cap to which it belongs, refer to Fig 3
- Installation position of connecting rod pairs, refer to Fig 4
- Axial play for each new connecting rod pair: 0.16 to 0.40 mm
- Radial play, measuring, refer to CONNECTING RODS, CHECKING RADIAL CLEARANCE .
Locking Ring
- Quantity: 2
- Replacing
Piston Pin
- Removing and installing, refer to PISTONS, REMOVING AND INSTALLING .
Piston
- Mark the installation position and cylinder allocation, refer to Fig 2
- Replace the piston if there are cracks on the piston head or piston shaft
- Removing and installing, refer to PISTONS, REMOVING AND INSTALLING .
- Check piston and cylinder bore, refer to PISTONS AND CYLINDER BORE, CHECKING .
Piston Rings
- Measuring the gap, refer to Figure
- Measuring side clearance, refer to Figure
- Use piston ring pliers (commercially available) for removing and installing
- Installed position: The "TOP" marking or side with writing faces the piston crown.
- Offset gaps by 120°

Fig 2: Piston Installation Position

Courtesy of AUDI OF AMERICA, LLC

CAUTION:

The coating on the piston crown could be destroyed.

Mark the allocation to the cylinder on the piston crown with paint to install used pistons. Do not mark the piston crown with a punch, notch or similar object.

Installed position:

The arrows on the piston heads point to the belt pulley side.

Fig 3: Mark Connecting Rod

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Only replace the connecting rods as a set.

-- Mark the connecting rod and connector rod bearing caps to each other and to the cylinder -arrow- with paint for installation.

Fig 4: Connecting Rod, Installed Location

Courtesy of AUDI OF AMERICA, LLC

The molded tabs -arrows- at the beveled surfaces of the connecting rod pairs must point toward each other.

Fig 5: Oil Spray Jet For Piston Cooling & Screws

Courtesy of AUDI OF AMERICA, LLC

Insert screws with locking compound and tighten to 9 Nm. For locking compound .
Oil Spray Jet

CAUTION:

The oil spray jets could get damaged.

Do not bend the oil injector jets.
Check that the oil spray jet is accessible after reinstalling the pins.
Bent oil injector jets must be replaced.