Knock on front seat cushion
- Make
- Alfa Romeo
- Model
- Brera and Spider Factory Service Manual
- Year
- 2005–2010
- Section
- Noise / vibrations › Knock on front seat cushion
Fault diagnosisKnock on front seat cushion
KNOCK ON FRONT SEAT CUSHION
Noise/knocking
| Test results | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
| Rock in the seat resting on the backrest; check the correct fastening to the floor (four M10 bolts) | Move on to Step 1 | Bolts securing seat to floor slack | Retighten the seat to the floor following the correct tightening cycle | |
| 1 | CHECK ON GUIDE FASTENINGS TO SEAT | All OK | Problems encountered | Operation |
| Check the fastenings of the guides to the seat (5 bolts) if the noise disappears | Move on to Step 2 | Noise disappears | Retighten the seat to the floor following the correct tightening cycle | |
| 2 | SEAT LIFTING HINGES CHECK | All OK | Problems encountered | Operation |
| Check for clearance at the seat lifting hinges and for noise at the torsion spring | Move on to Step 3 | 1. Excessive clearance in the seat lifting hinges 2. Noise from torsion spring | 1. Replace the seat lifting assembly 2. Lubricate the torsion spring and check the condition of the bush | |
| 3 | CHECK ON CUSHION SPRING FASTENING | All OK | Problems encountered | Operation |
| Check that the cushion springs are correctly fastened under the base | Move on to Step 4 | Detachment of spring mounting from front/rear crossmember | Reattach cushion springs to front/rear crossmembers | |
| 4 | CHECK ON CONDITION OF CUSHION SPRING TERMINAL | All OK | Problems encountered | Operation |
| Check the condition of the cushion spring terminals and spring joins | End of diagnosis | 1. Spring terminals broken or spring joins broken 2. The noise persists | 1. Replacement of front cushion spring assembly plate 2. Lubricate that contact areas of the springs with molybdenum disulphide, if the noise persists move on to Step 5 | |
| 5 | BACKREST FASTENING CHECK | All OK | Problems encountered | Operation |
| Check that the backrest is correctly fastened under the base of the cushion (four M8 bolts, two on each side) | End of diagnosis | Fixing bolts loosened | Retighten the backrest to the base under the cushion following the correct tightening cycle | |
Parts & tools for this job Staging For 2005 Alfa Romeo Brera
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