2888444 - S01 ENGINE KNOCK
The engine makes a cyclical noise, the intensity of which varies with the load and is noticeable during brisk acceleration and when long ratios are used| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|---|---|---|---|
| Disconnect the services belt and check whether the noise disappears. WARNING: do not let the engine run for long with the belt disconnectedPress the clutch and check whether the noise disappears | Continue to Step 1 | The noise disappears with the services belt disconnected | See table S10 | |
| The noise only occurs with the clutch engaged | See table S20 | |||
| 1 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
| Connect
the diagnostic equipment (Examiner or other instruments) to the
diagnostic socket Check:
| Continue to Step 2 | An error is detected in the control unit | Continue according to the instructions for the diagnostic equipment | |
| Lack of dialogue with the control unit | Restore the connection between the engine management control unit and the diagnostic connector See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | |||
| 2 | TIMING CHECK | All OK | Problems met | Operation |
| Check that the engine timing is correct | Continue to Step 3 | Timing not correct | Restore the correct engine timing Op. 1032B14 | |
| 3 | KNOCKING LOCATION CHECK | All OK | Problems met | Operation |
| Carry out a test to locate the precise area from which the knocking is coming (if necessary, use suitable equipment) | the knocking is not located:Continue to Step 4 | the knocking is coming from the cylinder head | Continue to Step 5 | |
| the knocking is coming from the cylinder block/crankcase | Continue to Step 4 | |||
| 4 | KNOCKING CONDITION CHECK | All OK | Problems met | Operation |
| Carry out a test to identify the conditions in which the knocking from the cylinder block/crankcase occurs | The knocking does not occur:Continue to Step 5 | The knocking occurs with the engine cold and decreases during acceleration | Overhaul the engine, in particular check the condition of the pistons and replace them (see Assembly 1028H) | |
| The knocking occurs with the engine cold and increases during acceleration | Overhaul the engine: in particular, check the condition of the main bearings and replace them: Op. 1024A10 | |||
| The knocking increases with the engine warm | Overhaul the engine, check the condition of the gudgeon pins and replace them (see Assembly 1028H) | |||
| The knocking disappears when the clutch is pressed | Overhaul the engine and check the crankshaft end float Op. 1024A24 | |||
| 5 | VALVE CLEARANCE CHECK | All OK | Problems met | Operation |
| Check that the valve tappet clearance is correct. Op. 1036H14 | Continue to Step 6 | Clearance not correct | Restore the correct valve clearance. Op. 1036H18 | |
| 6 | CYLINDER HEAD CHECK | All OK | Problems met | Operation |
Overhaul the cylinder and, in particular, check
| Continue to Step 7 | Cam worn or camshaft clearances incorrect | Renew or replace the components involved (see Assembly 1036B) | |
| 7 | CHECKING CORRECT OPERATION | All OK | Problems met | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists | Search for the fault starting from another symptom' | |