Chasing clonks (Solved)
- Thread starter billus99
- Start date
JamesO
New member
Well it looks like the old girl didnt come out of her recent adventures unscathed. Started getting a loud clonk from the nearside front, which turned out to be the ball joint (not really a surprise).
No problem thinks I and sunday the wishbone was changed for a spare whilst dodging rain.
Off for a spin and within ten minutes a new clonk appears at the back this time! I had noticed my handbrake had been quite poor so off came a disk and sure enough one spring has gone. More parts to order tuesday.
I'm not convinced the rear clonk was the brake shoes as it was a deep sound rather than a rattle. I checked the drop links and anything else I could see, I did notice that the transaxle will sway a fair bit from side to side. Anybody know how much side to 'swing' is ok?
The transaxle mount looked new when I swapped the transaxle last year (although it could be ruined now!) and I would love to avoid dropping that out again!
No problem thinks I and sunday the wishbone was changed for a spare whilst dodging rain.
Off for a spin and within ten minutes a new clonk appears at the back this time! I had noticed my handbrake had been quite poor so off came a disk and sure enough one spring has gone. More parts to order tuesday.
I'm not convinced the rear clonk was the brake shoes as it was a deep sound rather than a rattle. I checked the drop links and anything else I could see, I did notice that the transaxle will sway a fair bit from side to side. Anybody know how much side to 'swing' is ok?
The transaxle mount looked new when I swapped the transaxle last year (although it could be ruined now!) and I would love to avoid dropping that out again!
Lots of Q's there. 1. The gearboxes move around a LOT, particularly side to side. This is normal and to be expected. (The movement on the box when driving is quite small; the torque on the box is corrected by the torque tube mounting. Side-to-side force is negligable in real life.) 2. I had a similarly loud 'clonk' from the rear of my car about 6 months ago, and it turned out (eventually) to be a known fault in the koni rear shocks. The problem is that they over-extend when unloading (coming off bumps) and the 944 has no bump stops to counteract this. The movement is damped by a washer in the shocks, but this can collapse, causing the noise. The solution (on mine) was to swap the dampers from side to side (nearside one had failed, possibly on account of the proximity to the exhaust), and to adjust them to maximum rebound stiffness. This cured the problem entirely. I noticed that you have the Koni shocks as well, and this could be an avenue worth investigating. (It was Baz Hart at Hartech who eventually diagnosed mine - by eMail!) Alternatively it could be any one of a million other things which other people will no doubt suggest! Oli.
JamesO
New member
Ok I have a lovely handbrake now, took it for a test drive and the noise is worse. Noise can now be heard if you push the back down ( clonks on compression). next step I think is to remove the shocks altogether and see if it goes away, although I think its coming from the torque tube area itself. Nearly out of MOT now, anybody know if a clonk is a fail point?
Interesting....still haven't fixed my clonk/rattle o/s/r but I've been suspecting shock absorber bushes, thinking off new shocks, but a smear of grease would be cheaper. What's Copperslip....is this a regular copper brake grease?
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