A3 Mk2
| Pistons and conrods - exploded view |
| 1 - | Conrod bolt, 30 Nm + 1/4 turn (90°) further |
| q | Renew |
| q | Lubricate threads and contact surface |
| q | To measure radial clearance, tighten to 30 Nm but do not turn further |
| 2 - | Pressure relief valve, 27 Nm |
| q | Opening pressure: 1.6...1.9 bar |
| 3 - | Oil spray jet |
| q | For piston cooling |
| 4 - | Conrod bearing cap |
| q | Note installation position |
| q | Due to the cracking method used to separate the bearing cap from the conrod in manufacture, the caps only fit in one position and only on the appropriate conrod. |
| q | Mark cylinder number -B- |
| q | Installation position: Markings -A- face towards pulley end |
| 5 - | Bearing shell |
| q | Note installation position → Fig. |
| q | Do not interchange used bearing shells |
| q | Measuring axial clearance → Chapter |
| q | Measuring radial clearance → Chapter |
| 6 - | Conrod |
| q | With industrially cracked conrod bearing cap |
| q | Only renew as a complete set |
| q | Mark cylinder number -B- |
| q | Installation position: Markings -A- face towards pulley end |
| 7 - | Circlip |
| 8 - | Piston pin |
| q | If difficult to move, heat piston to 60 °C |
| q | Remove and install using drift -VW 222 A- |
| 9 - | Piston |
| q | Checking → Fig. |
| q | Mark installation position and cylinder number |
| q | Arrow on piston crown points to pulley end |
| q | Install using piston ring clamp |
| q | Checking cylinder bore → Fig. |
| 10 - | Piston rings |
| q | Offset gaps by 120° |
| q | Use piston ring pliers to remove and install |
| q | Marking faces to piston crown |
| q | Checking ring gap → Fig. |
| q | Checking ring-to-groove clearance → Fig. |
