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)

Or, hide this message: temporarily or permanently

Cylinder Block


Cylinder Block





Cylinder Bore
Standard (A)
B204 90.000-90.012 mm
B235R 90.000-90.020 mm

Standard (B)
B204 90.003-90.020 mm
B235R 90.020-90.040 mm

Standard (B+)
B204 90.011-90.030 mm
B235R No specification given

First Oversize
B204 90.500-90.512 mm
B235R 90.500-90.520 mm

Second Oversize
B204 91.000-91.012 mm
B235R 91.00-90.020 mm

Cylinder Head

Height, New Cylinder Head* 139.4-139.6 mm
Height, Minimum After Regrinding* 139.0 mm
*Applies to both B204 and B235R engines