Compression Test

Special Tools
999 9689
115 8540

Ignition system

Warning: The ignition system works with high ignition tension and dangerous voltage in both low and high tension circuits.

There are dangerously high voltages throughout the ignition system including the connectors etc.





Measure the compression with the engine at operating temperature and Wide Open Throttle (WOT)
Normal value B5204, B5254, B5252
MPa 1.3-1.5
Normal value B5234T
MPa 1.1-1.3

Note! Engine at operating temperature, Wide Open Throttle (WOT) and starter motor turning at 4.2 - 5.0 r/s (250 - 300 rpm).

Remove





- engine speed switch connector
- the cover plate over the ignition cables

Measure the compression





Measure compression with the engine at operating temperature and Wide Open Throttle (WOT)
Normal value B5204, B5254, B5252
MPa 1.3-1.5
Normal value B5234T
MPa 1.1-1.3

Note! Engine at operating temperature, Wide Open Throttle (WOT) and starter motor turning at 4.2 - 5.0 r/s (250 - 300 rpm).

Reinstall removed components.