Crankshaft Dimensions Audi TT 8N

1) 90° equals one quarter turn

Scheme 140

1 - Connecting rod bolt, 30 Nm + 90° (1/4 turn) further

1. Replace
2. Lubricate threads and contact surface
3. To measure radial clearance, tighten to 30 Nm but not further

2 - Connecting rod bearing cap

1. Mark cylinder allocation -B
2. Installed position: Markings -A- must be on same side

3 - Bearing shells

1. Installed position: retaining tabs of both bearing shells lie on same side of connecting rod
2. Do not interchange used bearing shells (mark)
3. Retaining tabs on bearing shells must fit tightly in recesses
4. Axial clearance, New: 0.05...0.31 mm; Wear limit: 0.40 mm

1. Measure radial clearance with Plastigage
2. Do not rotate crankshaft when measuring radial clearance
3. Radial clearance, New: 0.02...0.07 mm; Wear limit: 0.10 mm
4. Replacement parts are color coded "yellow" for lower and "red" for upper

4 - Connecting rod

1. With hole for piston pin lubrication
2. Only replace as a set
3. Mark cylinder allocation -B
4. Installed position: Mark -A- faces toward shallow side of piston (shallow side of piston crown faces cylinder block center)

5 - Circlip

6 - Piston pin

1. If difficult to move, heat piston to 60° C
2. Remove and install using drift VW 222 A

7 - Piston

1. Checking. Refer to «Checking piston»(ref-276269-S01193825702008021500000)
2. Mark installed position to connecting rod and cylinder allocation
3. Shallow side of piston crown faces center of cylinder block
4. Piston and cylinder dimensions. Refer to «Piston and cylinder dimensions»(ref-276269-S09083849552008010300000)

1. Install using T10147. Refer to «Installing piston with tool T10147»(ref-276269-S27932900072008021500000)

8 - Piston rings

1. Compression rings
2. Offset gaps by 120°
3. Remove and install using piston ring pliers
4. "TOP" must face toward piston crown

1. Checking ring gap. Refer to «Checking piston ring gap»(ref-276269-S20292376232008021500000)
2. Checking ring to groove clearance. Refer to «Checking ring to groove clearance»(ref-276269-S13577202212008021500000)

9 - Piston ring

1. Oil scraping ring
2. 3-part
3. Install upper steel ring so gap is offset by 120° to neighboring compression ring
4. Offset all gaps of oil scraping ring components to each other

Scheme 141

1. Insert ring at right angle to cylinder wall from above and push down into lower cylinder opening approx. 15 mm from bottom of cylinder. To do so, use a piston without rings.
2. Use a feeler gauge to measure.

Scheme 142

1. Clean groove in piston before checking clearance.
2. Use a feeler gauge to measure.

Scheme 143

1. Measure approx. 6 mm from lower edge, perpendicular to piston pin axis. Use an external micrometer, 75...100 mm, to measure.

1. Max. deviation from nominal dimension: 0.04 mm

Scheme 144

1. Make measurements at three positions diagonally in transverse direction -A- and in longitudinal direction -B-. Use a cylinder gauge, 50...100 mm, to measure.

1. Max. deviation from nominal dimension: 0.08 mm