198001932 - S011 ENGINE BUZZING

There is a loud noise of constant intensity coming from the engine, and only heard within a specific field of rpm.
TEST RESULTS
0PRELIMINARY CHECKSALL OKPROBLEMS ENCOUNTEREDACTION
Check the condition and seal of the air supply circuitMove on to Step 1Circuit component damaged.Replace the damaged component.
1ENGINE MOUNTINGS CONDITION CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the correctly fastening and condition of:- Engine mountings- Flexible mountings- Reaction linkMove on to Step 21. Incorrect fastening of engine mountings2. Gearbox-side engine mounting defective3. Timing-side engine mounting defective4. Rear engine mounting defective5. Front support flexible mounting defective6. Rear support flexible mounting defective7. Gearbox-side support flexible mounting defective8. Reaction link incorrectly fastened.1. Restore the correct fastening2. Replace the gearbox-side engine mounting    Op. 1008A42 POWER UNIT RIGID SUPPORT - GEARBOX SIDE - R.R. 3. Replace the timing-side engine mounting    Op. 1008A46 POWER UNIT RIGID SUPPORT - TIMING SIDE - R.R. 4. Replace the rear engine mounting5. Replace the front support flexible mounting    Op. 1008B10 POWER UNIT FRONT SUPPORT FLEXIBLE MOUNTING (TIMING SIDE) - REPLACE 6. Replace the rear support flexible mounting7. Replace the gearbox-side support flexible mounting    Op. 1008B30 GEARBOX SIDE SUPPORT FLEXIBLE MOUNTING(S) - REPLACE 8. Renew the correct fastening.
2ENGINE EXHAUST MOUNTINGS CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the exhaust pipe mountings are correctly fastened.Move on to Step 31. Mountings loose.2. Mounting damaged.1. Restore the correct fastening of the mountings.2. Replace the damaged component.
3ENGINE EXHAUST CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the engine exhaust system, in particular:- Manifold- Pipe- Exhaust silencerEnd of diagnosis1. Pipe assembly damaged.2. Rear silencer damaged.1. Replace the pipe assembly2. Replace the rear silencer    Op. 1076B20 REAR EXHAUST SILENCER - R + R