Overview - Piston And Connecting Rod

WARNING: This page is about a different car, the 2016 Audi Q5, 2015 Audi Q5, and 2014 Audi Q5. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Lubricate all bearings and running surfaces.

Oil injector jet for piston cooling, refer to Fig 2.

Fig 1: Overview Of Piston And Connecting Rod

Courtesy of AUDI OF AMERICA, LLC

Bolts
- 35 Nm + an additional 90° turn
- Replace
- Lubricate the thread and contact surface.
- Use old bolts to measure radial play.
Connecting Rod Bearing Cap
- Due to the separation procedure (cracking) of the connecting rod, the connecting rod bearing cap only fits in one position and only to the corresponding connecting rod.
- Mark for installation later
- Use color to identify the cylinder and connecting rod to which it belongs -B-, refer to Fig 4
- Note when installing: the wide thrust flange -A- must point to the same side on connecting rod and connecting rod bearing cap
Bearing Shells
- Pay attention to the installed position.
- Replace any worn bearing shells
- Note the version: the upper bearing shell (to piston) is made of wear-resistant material. How to recognize new bearing shells: there is a black line on the contact surface near the separating point.
- Make sure the tabs are tight
Connecting Rod
- With a cracked connecting rod bearing cap
- Use color to identify the cylinder and connecting rod bearing cap to which it belongs -B-, refer to Fig 4.
- Axial play for each new connecting rod pair: 0.20 to 0.44 mm
- Radial play, measuring, refer to CONNECTING RODS, CHECKING RADIAL CLEARANCE .
- Installed position, refer to Fig 5
- Always replace as a set.
- Note when installing: the wide thrust flange -A- must point to the same side on connecting rod and connecting rod bearing cap
Locking Ring
- Replace
Piston Pin
- Removing and installing, refer to PISTONS, REMOVING AND INSTALLING .
Piston
- Measure the piston projection at Top Dead Center (TDC), refer to PISTON PROJECTION, MEASURING AT TDC .
- Mark the installation position and cylinder allocation, refer to Fig 3
- 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 .
Locking Ring
- Replace
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: "TOP" marking or side with writing faces the piston crown.
- Offset gaps by 120°

Fig 2: Identifying Oil Spray Jet For Piston Cooling

Courtesy of AUDI OF AMERICA, LLC

Bolt - Tightening specification: 9 Nm
Oil Spray Jet for Cooling the Piston And Spray Jet Valve

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.

Fig 3: Installation Position: Arrow Faces Toward Pulley Side

Courtesy of AUDI OF AMERICA, LLC

CAUTION:

There is a risk of damaging the piston crowns.

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, scratch, notch or something similar.

Installation position: arrow -1- on the piston head toward the pulley side

Fig 4: Connecting Rod, Marking

Courtesy of AUDI OF AMERICA, LLC

-- Before removing, mark the allocation of the connecting rod and connecting rod bearing caps against each other with paint -arrow-.

NOTE:

Only replace the connecting rods as a set.

Do not interchange the connecting rod bearing.

Fig 5: Connecting Rod, Installed Position

Courtesy of AUDI OF AMERICA, LLC

The larger thrust flange on the connecting rod -arrow- faces the adjacent crankshaft bearing.

NOTE:

The front connecting rod pair is pictured here.