| TEST RESULTS |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Connect the Examiner diagnostic equipment to the diagnostic socket and check that there are no faults in the engine management control unit. | Move on to Step 2 | Error detected in the engine management control unit. | Continue following the instructions on the diagnostic equipment |
| 2 | AUXILIARY UNITS CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Disconnect the services belt and check whether the noise disappears | Move on to Step 3 | The noise disappears | Proceed as instructed in See table S010 ENGINE WHILSTLING / SERVICES BELT NOISY |
| 3 | KNOCK LOCATION CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Carry out a test to locate exactly the area where the knocking is coming, from using special equipment. | Move on to Step 4 | 1. The knocking is coming from the cylinder head2. The knocking is coming from the crankcase. | 1. Move on to Step 52. Move on to Step 4 |
| 4 | CYLINDER BLOCK/CRANKCASE KNOCK CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Carry out a test to identify the circumstances in which the cylinder block/crankcase knock occurs. | Move on to Step 5 | 1. The knocking occurs with the engine cold and decreases when warm; when accelerating it is audible on overrun.2. The knocking occurs with the engine cold and increases when accelerating in long ratios3. The knocking is heard at all temperatures4. The knocking is heard at all temperatures and decreases when the clutch pedal is pressed. | 1. Overhaul the engine: in particular, check the condition of the pistons and, if necessary, replace them Op. 1028H10 CONNECTING ROD AND PISTON SET - R.R 2. Overhaul the engine: in particular, check the condition of the crankshaft bearings and, if necessary, replace them Op. 1024A10 CRANKSHAFT - R.R WITH ENGINE REMOVED - CHECK AND, IF NECESSARY, REPLACE MAIN JOURNALS AND CRANKPINS 3. Overhaul the engine: in particular, check the condition of the connecting rod bearings and, if necessary, replace them Op. 1024A10 CRANKSHAFT - R.R WITH ENGINE REMOVED - CHECK AND, IF NECESSARY, REPLACE MAIN JOURNALS AND CRANKPINS 4. Overhaul the engine: in particular check for crankshaft judder. |
| 5 | TAPPET KNOCKING CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| If the vehicle is not often used, it is possible that an accentuated knocking of the tappets will be heard for a few minutes during start up, which will then gradually decrease. | Move on to Step 6 | Tappet knocking persists. | Check hydraulic tappets operationand replace those that do not work. |
| 6 | CYLINDER HEAD CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Overhaul the cylinder head and, in particular, check:- no cam wear;- cam axis clearance;- valves and springs. | End of diagnosis | Cam wear or incorrect camshaft clearance | Repair or replace the components concerned. |
