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

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Piston Ring, Engine

M54 2.5L / 3.0L Piston Rings
M54 2.5L -- --
1st groove -- --
End clearance mm 0.20 - 0.40
Axial play mm 0.020 - 0.060
2nd groove -- --
End clearance mm 0.20 - 0.060
Axial play mm 0.020 - 0.060
3rd groove (oil scraper) -- --
End clearance mm 0.20 - 0.45
Axial play mm 0.015 - 0.060
-- --
M54 3.0L -- --
1st groove -- --
End clearance mm 0.20 - 0.40
Axial play mm 0.020 - 0.060
2nd groove -- --
End clearance mm 0.20 - 0.40
Axial play mm 0.020 - 0.060
3rd groove (oil scraper) -- --
End clearance mm 0.20 - 0.45
Axial play mm 0.015 - 0.060