Overview - Piston And Connecting Rod: Notes
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 Audi S7, 2018 Audi RS 7, 2017 Audi S7, 2017 Audi RS 7, and 2016 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 figure in Oil Spray Jet For Piston Cooling .
- Bolts
- 50 Nm + 90°
- Always replace
- 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 figure in Marking Connecting Rods .
- Installation position of connecting rod pairs. Refer to figure in Connecting Rod Installed Location .
- Bearing Shells
- Make sure the tabs are tight
- Replace any worn bearing shells
- Oversized 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 figure in Marking Connecting Rods .
- Installation position of connecting rod pairs. Refer to figure in Connecting Rod Installed Location .
- 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
- Always replace
- Quantity: 2
- Piston Pin
- Removing and installing. Refer to PISTONS, REMOVING AND INSTALLING .
- Piston
- Mark the installation position and cylinder allocation. Refer to figure in Piston Installation Position .
- 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 Piston Gap Checking .
- Measuring side clearance. Refer to figure in Clean The Piston Ring Groove Before Checking .
- 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°