A5
| Pistons and conrods - exploded view |
| 1 - | Bolts |
| q | Renew |
| q | Lubricate threads and contact surface |
| q | 50 Nm + turn 90° further |
| 2 - | Conrod bearing cap |
| q | Mark installation position for re-installation |
| q | Mark cylinder and conrod allocation in colour → Fig. |
| q | Installation position of conrod pairs → Fig. |
| 3 - | Bearing shells |
| q | Ensure that retaining lugs are securely seated. |
| q | Renew used bearing shells |
| q | There are oversized bearings available for machined crankshaft conrod journals → Electronic parts catalogue |
| q | Lugs on conrod bearings must be on the same side |
| 4 - | Conrod |
| q | Only renew as a complete set |
| q | Mark cylinder and conrod bearing cap allocation in colour → Fig. |
| q | Installation position of conrod pairs → Fig. |
| q | Axial clearance for each conrod pair (when new): 0.20 … 0.45 mm |
| q | Measuring radial clearance → Chapter |
| 5 - | Circlip |
| q | Renew |
| 6 - | Piston pin |
| q | Removing and installing → Chapter „Removing and installing pistons“ |
| 7 - | Piston |
| q | Mark installation position and cylinder number → Fig. |
| q | Removing and installing → Chapter |
| q | Renew piston if cracking is visible on piston crown or piston skirt |
| q | Checking pistons and cylinder bores → Chapter |
| 8 - | Piston rings |
| q | Measuring ring gap → Fig. |
| q | Measuring ring-to-groove clearance → Fig. |
| q | Use piston ring pliers (commercially available) to remove and install |
| q | Installation position: marking „TOP“ or side with lettering faces towards piston crown |
| q | Offset gaps by 120° |
Caution
Note
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