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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Valve Seat

Valve seat angle
Inlet 45°
Exhaust 45°

Valve seat material Sintered iron (Brico A025/M)
Inlet valve seat outside diameter
Standard 47.041 - 47.054 mm (1.852 - 1.8525 in)
Interference fit in cylinder head 0.0762 mm (0.003 in)
Exhaust valve seat outside diameter
Standard 43.066 - 43.078 mm (1.6955 - 1.6960 in)
Interference fit in cylinder head 0.0762 mm (0.003 in)