Cylinder Compression Test - Ducati Diavel Workshop Manual

Diagnostic instruments
Important
The maximum pressure must never exceed 6.0 bar.
Excessively high pressure may indicate that the relief valve is stuck. Excessively low pressure, on the other hand, may be
caused by the relief valve being stuck in the open position, the relief valve spring being too weak, or a faulty oil pump.
Other causes are excessively worn seals and gaskets or a badly worn engine.
Remove the gauges and refit the pressure switch (1) with its seal. Tighten it to a torque of 19 Nm ± 10% (Sect. 3 - 3,
Frame torque settings).
Connect the electrical system connector (F) to the pressure switch.
Disconnect the DDS diagnosis instrument.
Operations
Reassemble the right belly fairing

Cylinder compression test

Note
The on-screen icons used during this procedure are explained in a table at the end of this section.
Engine performance is directly correlated to the pressure that can be measured in the combustion chambers of the two
cylinders. Pressure which is too high/low or an excessive difference between the two cylinders will cause a drop in engine
performance and can cause engine breakdowns.
Operations
Remove the seat
Remove the tank fairing
To reach the vertical head spark plug lift the tank up as specified under the Section 8 - 2
fit a drift under it.
Run the engine so that it warms up to the point that the fan is tripped at least once.
Open the throttles completely.
Remove the HT leads (1), unscrewing the nuts (2) of both spark plugs.
Remove the spark plug from the cylinder to be tested.
Section reference
5 - 5, Reassembly of belly fairing
Section reference
5 - 3, Removal of the seat
5 - 2, Removal of the fuel tank
fairings
"Removal of the fuel tank" and