Superb
Disassembling and assembling piston and conrod |
1 - | Piston rings |
q | Offset joint 120 ° |
q | use piston ring pliers for removing and installing |
q | marking “TOP” faces piston crown |
q | inspect gap clearance → Fig. |
q | inspect end clearance → Fig. |
2 - | Piston |
q | check → Fig. |
q | mark installation position and matching cylinder |
q | arrow on piston crown faces towards the belt pulley side |
q | use piston ring tensioning strap for installing |
q | piston Ø 82.465 mm |
3 - | Piston pin |
q | if stiff, heat piston to 60°C |
q | remove and install with VW 222A |
4 - | Circlip |
5 - | Conrod |
q | with a split bearing cap |
q | replace as a set only |
q | mark assignment to cylinder -B- |
q | Fitting position: markings -A- point toward belt pulley side |
6 - | Bearing shell |
q | check fitting position → Fig. |
q | do not mix up used bearing shells |
q | insert bearing shells in the centre |
q | Axial play when new: 0.05...0.31 mm, wear limit: 0.37 mm |
7 - | Cylinder block |
q | inspect cylinder bore → Fig. |
q | Piston and cylinder dimensions |
q | piston Ø 82.51 mm |
8 - | Conrod cap |
q | Check fitting position |
9 - | 30 Nm + torque a further 1/4 turn (90 °) |
q | replace |
q | oil thread and head contact surface |
Piston ring | Gap clearance | ||
new | Wear limit | ||
Compression rings | mm | 0,20...0,40 | 0,8 |
Oil scraper ring | mm | 0,25...0,50 | 0,8 |
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Piston ring | End clearance | ||
new | Wear limit | ||
Compression rings | mm | 0,06...0,09 | 0,20 |
Oil scraper ring | mm | 0,03...0,06 | 0,15 |
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Note
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