323001362 - S001 ENGINE KNOCK

The engine makes a cyclical noise - with the intensity varying according to the load - which is audible during brisk acceleration and when using long ratios.
TEST RESULTS
1CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
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 2Error detected in the engine management control unit.Continue following the instructions on the diagnostic equipment
2AUXILIARY UNITS CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Disconnect the services belt and check whether the noise disappears
Move on to Step 3The noise disappearsProceed as instructed in    See table S010 ENGINE WHILSTLING / SERVICES BELT NOISY
3KNOCK LOCATION CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Carry out a test to locate exactly the area where the knocking is coming, from using special equipment.Move on to Step 41. 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
4CYLINDER BLOCK/CRANKCASE KNOCK CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Carry out a test to identify the circumstances in which the cylinder block/crankcase knock occurs.Move on to Step 51. 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.
5TAPPET KNOCKING CHECKALL OKPROBLEMS ENCOUNTEREDACTION
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 6Tappet knocking persists.Check hydraulic tappets operationand replace those that do not work.
6CYLINDER HEAD CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Overhaul the cylinder head and, in particular, check:- no cam wear;- cam axis clearance;- valves and springs.End of diagnosisCam wear or incorrect camshaft clearanceRepair or replace the components concerned.