Golf Mk6
Assembly overview - pistons and conrods |
1 - | Conrod bolt |
q | M8: 30 Nm + turn 90° further. |
q | M9: 45 Nm + turn 90° further. |
q | Renew. |
q | Oil threads and contact surface. |
q | Use old bolt for measuring radial clearance. |
q | For radial clearance measurement, do not turn 90° further |
2 - | Conrod bearing cap |
q | Note installation position. |
q | The caps only fit in one position and only on the appropriate conrod due to the breaking procedure (cracking) separating the cap from the conrod. |
q | Mark with cylinder number -A-. |
q | Installation position: Marking -B- faces towards pulley end. |
3 - | Bearing shells |
q | Installation position → Fig.. |
q | Do not interchange used bearing shells (mark). |
q | Axial clearance new: 0.10…0.35 mm , wear limit: 0.40 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. |
4 - | Pressure relief valve |
q | 27 Nm |
q | Opening pressure: 1.6…1.9 bar |
5 - | Oil spray jet |
q | For piston cooling. |
6 - | Circlip |
7 - | Piston pin |
q | If difficult to remove, heat piston to approx. 60 °C. |
q | Remove and install using drift -VW 222 A-. |
8 - | Piston |
q | Check → Anchor. |
q | Mark installation position and cylinder number. |
q | Arrow on piston crown points to belt pulley end. |
q | Install using piston ring clamp. |
q | Piston and cylinder dimensions → Chapter. |
q | Checking cylinder bores → Anchor. |
9 - | Compression rings |
q | Offset gaps by 120°. |
q | Use piston ring pliers to remove and install. |
q | „TOP“ must face towards piston crown |
q | Checking ring gap → Fig.. |
q | Checking ring-to-groove clearance → Fig.. |
10 - | Oil scraper ring |
q | 2 parts |
q | Offset gap of top steel element of piston ring by 120° to next compression ring |
q | Offset gaps of individual parts of oil scraper ring. |
q | Checking ring gap → Fig.. |
q | Ring-to-groove clearance cannot be checked. |
11 - | Conrod |
q | Renew as set only. |
q | Mark with cylinder number -A-. |
q | Installation position: Marking -B- faces towards pulley end. |
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Piston ring dimensions in mm | New | Wear limit |
compression ring | 0.20 … 0.40 | 0.8 |
Oil scraper ring | 0.25 … 0.50 | 0.8 |
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Piston ring dimensions in mm | New | Wear limit |
1st compression ring | 0.06 … 0.09 | 0.20 |
2nd compression ring | 0.03 … 0.06 | 0.15 |
Oil scraper rings | Not measurable |
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Note
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