Golf Mk5
Assembly overview - pistons and conrods |
1 - | Conrod bolt, 30 Nm + 1/4 turn (90°) further |
q | Renew |
q | Oil threads and contact surface. |
q | To measure radial clearance, tighten to 30 Nm but not further. |
2 - | Pressure relief valve, 27 Nm |
q | Opening pressure: 1.3...1.6 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 → Chapter |
q | Do not interchange used bearing shells. |
q | Axial clearance new: 0.10…0.35 mm, wear limit 0.4 mm |
q | Measure radial clearance using Plastigage; new: 0.02…0.06 mm; wear limit: 0.09 mm. Do not rotate crankshaft when checking radial clearance. |
6 - | Conrod |
q | With industrially cracked conrod 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 remove, heat piston to 60 °C. |
q | Remove and install with drift -VW 222 A-. |
9 - | Piston |
q | Checking → Fig. |
q | Mark installation position and cylinder number. |
q | Arrow on piston crown points to belt pulley end. |
q | Install using piston ring clamp. |
q | Checking cylinder bores → Fig.. |
q | Piston and cylinder dimensions → Chapter. |
10 - | Piston rings |
q | Offset gaps by 120° |
q | Remove and install using piston ring pliers. |
q | Markings to piston crown |
q | Checking ring gap → Fig.. |
q | Checking ring-to-groove clearance → Fig.. |