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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Cylinder Bore Diameter

Cylinder Bore Standard (A)
The cylinder classification, A, B or B+ , is stamped on the cylinder face and is specified for each cylinder. They can all occur in the same cylinder block.
90.000 - 90.012
Standard (B)
The cylinder classification, A, B or B+ , is stamped on the cylinder face and is specified for each cylinder. They can all occur in the same cylinder block.
90.003 - 90.020
Standard (B+)
The cylinder classification, A, B or B+ , is stamped on the cylinder face and is specified for each cylinder. They can all occur in the same cylinder block.
90.011 - 90.030
First Oversize 90.500 - 90.512
Second Oversize 91.000 - 91.012