Piston markings:
A - the letter designation next to the arrow corresponds to the index of the spare part number. It serves as a hallmark
B - the arrow points to the front of the engine. The piston is installed with an arrow in the direction of the flywheel
C - dot applied with paint (blue, pink or green), indicates the size class of the pair "cylinder-piston"
D - piston mass class ("+" or "-")
E - piston mass 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 at a distance of approximately 4-5 mm from the edge of the cylinder.
Use a feeler gauge to check the clearance in the piston ring lock. Replace rings with increased clearance.
Gap in the lock, mm | Wear limit, mm | |
Top 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 clearance of piston rings in height
Insert piston rings with pliers and check height clearance.
Height gap, mm | Wear limit, mm | |
Top 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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