Section : Suspension

Suspension and steering.

Sharp Knock from Right Rear

Posted By : Stephen Pratt, 26-Nov-2005, 08:30pm

My Spitfire 1500 emits a sharp knock whenever the right rear wheel hits a sharp ridge/pothole, it only happens on the right hand side, not the left. I have put the car up on axle stands and checked all the mountings which seem sound, The spring and rear diff were replaced 3 years ago (by the previous owner) as was the UJ. Has anyone experienced this problem,I intend the strip down the rear suspension this winter but any suggestions would be greatly appreciated.

Followups :

Sharp Knock from Right Rear

Posted By : Philip Brammer, 26-Nov-2005, 10:56pm

I would suspect a faulty shock absorber. Is there any sign of oil leakage from it? Also if you grab hold of the wheelarch and forcefully pull it up and down can you hear a knock? If it is the shocker don't forget to always replace both sides.
- Sharp Knock from Right Rear
  
  Posted By : Stephen Pratt, 27-Nov-2005, 09:53pm
  
  Thanks Phil
  
  I'll have a close look at the shock absorber this week
  
  Steve
  76 Spitfire 1500
  - Sharp Knock from Right Rear
    
    Posted By : Stephen Pratt, 12-Dec-2005, 10:26pm
    
    Phil - Just to let you know you were right! I replaced the rear shox with a pair sourced from Jigsaw Racing through Ebay - a couple of old stock Boge Automatics for only Â£10 the pair! - I removed the 5 year old Woodheads and put the new Boge units on, and the difference is unbelievable, not only has the sharp knock gone (having tested them against some known potholes!) but the ride has also improved. The difference in pressure required to compress the new units by hand was considerable compared to the old units.
    
    Thanks again for the advice -
    
    Steve
    76 1500 Inca Yellow
    - Sharp Knock from Right Rear
      
      Posted By : Philip Brammer, 14-Dec-2005, 01:33pm
      
      You are very welcome, its one of the benefits of joining the club!