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my car goes bump
https://www.ausmini.com/forums/viewtopic.php?f=2&t=37955		 Page 1 of 2
Author:  peter1 [ Mon Nov 19, 2007 6:24 pm ]
Post subject:  my car goes bump
Looking for suggestions as to what this might be - occasionally, not every time, when moving off from stationary in the mini, I get a single bump that is quite audible and can be felt through the floor - even the mrs notices it, so it must be quite noticable! :roll:
There's no shudder, or CV type noise, just a single bump. Tends to do it with mild throttle, eg when having to move from a standstill uphill, rather than very light throttle.
Everything is pretty new in the car - all engine/gearbox rebuilt, new engine and gearbox mounts, new bushes etc. Sounds (and feels) like it is coming from roughly forward of midships.
Probably very hard to diagnose from my description, but maybe some others have experienced similar?
Cheers.
Peter :)
Author:  Mick [ Mon Nov 19, 2007 6:42 pm ]
Post subject: 
What's the condition of the hardy spicer unis??
Author:  peter1 [ Mon Nov 19, 2007 6:47 pm ]
Post subject: 
Well, they were checked over and considered good enough to go back in...... :?
Author:  drmini in aust [ Mon Nov 19, 2007 6:48 pm ]
Post subject: 
I think probably the little rebound rubbers under the top arms have gone awol, the grease tends to shag them. You then get metal to metal contact as the bow rises in 1st gear. :lol:
Cheap and easy to replace...
Author:  peter1 [ Mon Nov 19, 2007 6:50 pm ]
Post subject: 
drmini in aust wrote:
I think probably the little rebound rubbers under the top arms have gone awol, the grease tends to shag them. You then get metal to metal contact as the bow rises in 1st gear. :lol:
Cheap and easy to replace...

Showing my ignorance here - not sure what you're refering to there Dr :oops:
Author:  Mick [ Mon Nov 19, 2007 6:56 pm ]
Post subject: 
You don't mean these do you?

Image
Author:  simon k [ Mon Nov 19, 2007 7:05 pm ]
Post subject: 
mine does that too, I reckon it's play in the top suspension arm bushes

edit: can also be from the steering rack, doubt if it's the rebound rubbers as the top arm isn't touching them at rest
Author:  drmini in aust [ Mon Nov 19, 2007 7:19 pm ]
Post subject: 
not touching at rest I agree but when the front lifts in 1st gear, the arms drop heaps, particularly in a hydro car..
Mine clunked until I changed them. The grease-allergic natural (Indian?) rubber had departed from the metal bit. :lol:
Author:  peter1 [ Mon Nov 19, 2007 7:38 pm ]
Post subject: 
Thanks guys for your excellent responses as always - will check out those rubbers as the first priority (cheapest and easiest to start with?) and work from there. 8)
What is the actual part called (for ordering purposes)?
Author:  drmini in aust [ Mon Nov 19, 2007 7:42 pm ]
Post subject: 
Bump rubber- 2A4267
$7 or so ea at Karcraft. :wink:
Author:  peter1 [ Mon Nov 19, 2007 7:47 pm ]
Post subject: 
Cheers! 8)
Author:  simon k [ Mon Nov 19, 2007 7:51 pm ]
Post subject: 
hmmm, OK on the bump rubbers... I guess it's not an issue on my car cos I have at least an inch clearance there :lol:

another question, does it happen when you take off quick, or slow ?

your missus feeling it through the floor points more towards the steering rack - the felt at the left hand end wears out and lets the rack move in the housing.... test it by reversing in a straight line (slow or fast) and then going forwards (slow or fast)

what do you reckon Kev?
Author:  peter1 [ Mon Nov 19, 2007 7:54 pm ]
Post subject: 
simon k wrote:
another question, does it happen when you take off quick, or slow ?

Doesn't seem to matter - but probably more likely quicker rather than slowly.......
Author:  simon k [ Mon Nov 19, 2007 7:58 pm ]
Post subject: 
after the rebound rubbers, I guess you ought to check if the engine steady bushes are tight, if you can rock the motor enough to make it go thump - the exhaust might be hitting the firewall or subframe

there are lots of things on these little cars that can go thump :)
Author:  peter1 [ Mon Nov 19, 2007 8:17 pm ]
Post subject: 
simon k wrote:
after the rebound rubbers, I guess you ought to check if the engine steady bushes are tight, if you can rock the motor enough to make it go thump - the exhaust might be hitting the firewall or subframe

there are lots of things on these little cars that can go thump :)

Thanks mate - all the mounts and steady bushes are new, but will check them in the morning. Have teed up with my mate to check out the rebound rubbers on the weekend.
Cheers.
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