Leon Mk2
Piston and conrod - Components overview |
Note
Before carrying out assembly work, oil should be applied to the support and slide surfaces. |
t | Piston and cylinder measurements → Chapter |
1 - | Safety ring |
2 - | Piston spring pin |
q | If difficult to move, heat piston to 60 °C |
q | Removing and installing with the tappet -T20019- |
3 - | Piston |
q | Testing → Fig. |
q | Mark installation position and respective cylinder |
q | The arrow on the piston head should point towards the pulley |
q | Install using piston ring installation sleeve |
4 - | Compression rings |
q | Displace cutouts 120º |
q | Remove and install compression rings using piston ring pliers |
q | The labelling “TOP” must face towards piston crown |
q | Ring ends: check clearance → Fig. |
q | Checking piston ring side clearance checking → Fig. |
5 - | Oil scraper rings |
q | Carefully remove and install by hand the oil scraper rings made up of 3 parts |
q | The labelling “TOP” must face towards piston crown |
q | Ring ends: check clearance → Fig. |
q | Checking piston ring side clearance checking → Fig. |
6 - | Conrod |
q | Renew as set only. |
q | Mark cylinder assignment -A- |
q | Installation position: The marks -B- should point in the direction of the pulley |
q | Piston axial guided |
7 - | Conrod bearing caps |
q | Rods divided by fracturing “cracking” can only be fitted in one position and only with the corresponding conrod |
8 - | Conrod bolt, tighten to 20 Nm +1/4 turn (90 °) further |
q | Renew |
q | Oil threads and contact surface. |
q | To measure radial play, tighten to 20 Nm, without retightening |
9 - | Engine block |
q | Interior cylinder diameter: checking → Fig. |
q | Piston and cylinder measurements → Chapter |
10 - | Half bearing |
q | Do not interchange used bearing shells |
q | Centrally align bearing shells on insertion |
q | Check the radial play using a Plastigage: |
New: 0.020..0.00.061 mm |
Wear limit: 0.091 mm |
When measuring the radial play, do not rotate the crankshaft |
Piston ring Dimensions in mm | New | Wear limit |
1. compression rings | 0,20...0,50 | 1,0 |
2. compression rings | 0,40...0,70 | 1,0 |
Oil scraper ring | 0,25...0,50 | --- → Note |
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Piston ring Dimensions in mm | New | Wear limit |
1. compression rings | 0,04...0,08 | 0,15 |
2. compression rings | 0,02...0,06 | 0,15 |
Oil scraper ring | not measurable |
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Note
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