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

Pressure, Vacuum and Temperature Specifications

Spark Advance Degree Chart:






VACUUM UNIT ADVANCE SPECIFICATIONS (degrees @ applied vacuum)

1. 0° ± 2° @ 2.95 inHg (75 mmHg)
2. 15° ± 2° @ 17.72 inHg (450 mmHg)

VACUUM UNIT RETARD SPECIFICATIONS (degrees @ boost pressure)

1. -5° ± 2° @ 7.7 psi (53.2 kPa)
2. 0° ± 2° @ 1.54 psi (10.64 kPa)