Notes on compression test - AH07.00-P-3004-01WA
Engine 104, 111, 112, 113, 119, 120
As an initial measurement, the compression can be tested with HHT or STAR DIAGNOSIS.
From an engine speed difference of > 8 revolutions for engines 104/112/113 as well as > 5 revolution for engine 111, a mechanical fault may be present.
The differences in engine speed are revealed in different ways on each engine so that it is not possible to draw any conclusions regarding which cylinder or cylinders are faulty.
If the differences in engine speed are exceeded, it is necessary to conduct a mechanical compression pressure test/cylinder leak test at all the cylinders in order to accurately pinpoint the fault.
Good image compression test
Fault image compression test