2582496 - 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 | ||||||
| 1 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation | ||
|---|---|---|---|---|---|---|
| Connect the diagnostic equipment to the diagnostic socket and check:that there are no faults in the engine management control unit | Continue to Step 2 | An error is detected in the control unit | Continue following the instructions for the diagnostic equipment | |||
| 2 | CHECKING AUXILLARY COMPONENTS | All OK | Problems met | Operation | ||
Disconnect
the services belt and check whether the noise disappears.
| Continue to Step 3 | The noise disappears | See table S10 ENGINE WHILSTLING / SERVICES BELT NOISY' | |||
| 3 | CHECKING LOCATION OF KNOCK | All OK | Problems met | Operation | ||
| Carry out a test to locate the precise area from which the knocking is coming, using suitable equipment) | 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 | CRANKCASE KNOCKING CONDITION CHECK | All OK | Problems met | Operation | ||
| Carry out a test to identify the conditions in which the knocking from the crankcase occurs. | Continue to Step 5 | The knocking occurs with the engine cold, decreases with the engine hot and can be heard when releasing the accelerator. | Overhaul the engine, in particular check the condition of the pistons and replace them if necessary. Op. 1028H14 | |||
| The knocking occurs with the engine cold and increases during full acceleration with a long ratio. | Overhaul the engine: in particular, check the condition of the main bearings and replace them if necessary. Op. 1024A10 | |||||
| The knocking is of a low intensity when cold but increases with the engine warm | Overhaul the engine: in particular, check the condition of the gudgeon pins and replace them. Op. 1028H60 | |||||
| The knocking can be heard at all temperatures | Overhaul the engine: in particular, check the condition of the big end bearings and replace them if necessary Op. 1024A10 | |||||
| The knocking can be heard at all temperatures and decreases when the clutch pedal is pushed. | Overhaul the engine and check the crankshaft end float. Op. 1024A10 | |||||
| Carry out a test to identify the conditions in which the knocking from the crankcase occurs. | Continue to Step 5 | The knocking occurs with the engine cold, decreases with the engine hot and can be heard when releasing the accelerator. | Overhaul the engine, in particular check the condition of the pistons and replace them if necessary. Op. 1028H14 | |||
| The knocking occurs with the engine cold and increases during full acceleration with a long ratio. | Overhaul the engine: in particular, check the condition of the main bearings and replace them if necessary. Op. 1024A10 | |||||
| The knocking is of a low intensity when cold but increases with the engine warm | Overhaul the engine: in particular, check the condition of the gudgeon pins and replace them. Op. 1028H60 | |||||
| The knocking can be heard at all temperatures | Overhaul the engine: in particular, check the condition of the big end bearings and replace them if necessary Op. 1024A10 | |||||
| The knocking can be heard at all temperatures and decreases when the clutch pedal is pushed. | Overhaul the engine and check the crankshaft end float. Op. 1024A10 | |||||
| 5 | CHECK ON VALVE CLEARANCES | All OK | Problems met | Operation | ||
| Check the valve tappet clearance Op. 1036H14 | Continue to Step 6 | Clearance not correct | Adjust the valve clearance Op. 1036H10 | |||
| 6 | CHECKING CYLINDER HEAD | All OK | Problems met | Operation | ||
| 1.2 8v | Overhaul the cylinder head and, in particular, check
| Continue to Step 7 | Cam worn or incorrect camshaft clearances | Restore or replace the components involved | ||
| 1.9 DIESEL | Overhaul the cylinder head and, in particular, check
| Continue to Step 7 | Cam worn or incorrect camshaft clearances | Restore or replace the components involved | ||
| 7 | CHECK ON CORRECT OPERATION | All OK | Problems met | Operation | ||
| Check that the fault is no longer present | Fault persists | Search for the fault starting from another symptom' | ||||
