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

Valve Spring


Valve Spring Specifications
Spring Diameter:
External 27.90 mm ± 0.2
Internal 21.10 mm ± 0.2
Spring Tension:
Length / Load N:
L 42.00 mm (0 N)
L1 34.00 mm (270 N ± 15)
L2 24.50 mm (670 N ± 32)


NOTE: Check springs in spring tester, tool No. 999 9802, or equivalent.