Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Piston, Engine


Grind distance
Basic dimension
Piston 82.455 mm 1)
Repair stage
Piston 82.955 1)
Basic dimension
Cylinder bore 82.51 mm
Repair stage
Cylinder bore 83.01 mm

1) Measurements without graphite coating (thickness = 0.02 mm) Graphite coating wears away.

(1) Compression ring
New 0.35 to 0.50 mm
Wear limit 0.8 mm
(2) Compression ring
New 0.60 to 0.80 mm
Wear limit 1.0 mm
Oil scraper ring
New 0.25 to 0.50 mm
Wear limit 0.8 mm
Compression rings
New 0.02 to 0.08 mm
Wear limit 0.20 mm
Oil scraper ring
New 0.02 to 0.08 mm
Wear limit 0.15 mm