| | Results of the tests |
| 1 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
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| Connect the diagnostic equipment to the diagnostic socket and check that there are no faults at the engine management node | 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 |
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| Disconnect the service belt and check whether the noise disappears. | Do not let the engine run for long with the belt disconnected |
| Continue to Step 3 | The noise disappears | Continue according to the instructions for theSee table See table S10 ENGINE WHILSTLING / SERVICES BELT NOISY |
| 3 | CHECKING LOCATION OF KNOCK | All OK | Problems met | Operation |
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| 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 |
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| 2.0 JTS3.2 V6 | 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. Op. 1028H10 PISTON WITH CONNECTING ROD - R R |
| 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. Op. 1024A10 CRANK SHAFT - R + R WITH ENGINE REMOVED - CHECK MAIN AND CONNECTING ROD BEARINGAND REPLACE IF NECESSARY |
| 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. Op. 1028H60 PISTON, PIN SET - REPLACE |
| 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. Op. 1024A10 CRANK SHAFT - R + R WITH ENGINE REMOVED - CHECK MAIN AND CONNECTING ROD BEARINGAND REPLACE IF NECESSARY |
| 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 |
| 3.2 V6 | 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. Op. 1028h34 PISTON/CYLINDER LINER SET - R R |
| 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. Op. 1024A10 CRANK SHAFT - R + R WITH ENGINE REMOVED - CHECK MAIN AND CONNECTING ROD BEARINGAND REPLACE IF NECESSARY |
| 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. Op. 1024A10 CRANK SHAFT - R + R WITH ENGINE REMOVED - CHECK MAIN AND CONNECTING ROD BEARINGAND REPLACE IF NECESSARY |
| 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 |
| 5 | CHECKING TAPPET KNOCK | All OK | Problems met | Operation |
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| If the car is not used frequently, an accentuated knocking sound may be heard from the tappets for a few minutes upon start up before gradually disappearing | Continue to Step 6 | Tappet knock persists | Continue to Step 6 |
| 6 | CHECKING CYLINDER HEAD | All OK | Problems met | Operation |
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| Overhaul the cylinder head and, in particular, check - the operation of the hydraulic tappets
- that the cams are not worn
- variable valve timing system
- camshaft clearane
- valves and springs
| Continue to Step 7 | Cam worn or camshaft clearances incorrect | Restore or replace the components involved |
| Tappets noisy | Check hydraulic tappet operation Op. 1036H60and replace any that are not working |
| 7 | CHECK ON CORRECT OPERATION | All OK | Problems met | Operation |
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| Check that the fault is no longer present | End of diagnosis | . | |