Piston markings:
A - the letter designation next to the arrow corresponds to the spare part number index. It serves as a distinguishing feature
B - arrow points to the front of the engine. The piston is installed with the arrow pointing towards the flywheel
C - a dot applied with paint (blue, pink or green), indicates the "cylinder-piston" size class
D - piston weight class ("+" or "-")
E - piston weight class (brown dot - gray - "+")
F - piston diameter (in mm)
The piston ring in the installed position must have a gap that does not exceed a certain value.
Push the ring at a right angle into the bottom hole of your cylinder to a distance of approximately 4-5 mm from the edge of the cylinder.
(The original text can be found on the portal: vwmanual.ru)
Check the gap in the piston ring joint using a feeler gauge. Replace rings with increased clearance.
| Gap in the lock, mm | Wear limit, mm | |
| Upper compression ring | 0,30-0,45 | 0,90 |
| Lower compression ring | 0,30-0,45 | 0,90 |
| Oil scraper ring | 0,25-0,40 | 0,95 |
Checking the piston ring clearance by height
Insert the piston rings using pliers and check the height clearance.
| Height clearance, mm | Wear limit, mm | |
| Upper compression ring | 0,07-0,10 | 0,12 |
| Lower compression ring | 0,05-0,07 | 0,10 |
| Oil scraper ring | 0,03-0,05 | 0,10 |
Replace piston rings that have reached the wear limit.
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