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Aerodynamic rattle In truck mirror

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Aerodynamic rattle In truck mirror

Old 3rd Dec 2018, 06:55
  #21 (permalink)  
 
Join Date: Nov 2014
Location: Australia
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Could be worse, my last car (Mitsubishi Magna TJ) had something wonky in the airflow around the mirrors that made them whistle once you hit about 110km/h, bit of tape around where they mounted to the body work "fixed" the issue.
Not to mention my granddad's old SAAB 96 that had enough of a wobble in the bodywork once you hit 100 that the bonnet latch shook loose, kind of unsettling to see the front all of a sudden rocket up a few inches but as it was a front opening design the darn thing never blew fully open.
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Old 3rd Dec 2018, 07:35
  #22 (permalink)  
I don't own this space under my name. I should have leased it while I still could
 
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Wingnut, the design might be the same but there is no guarantee that the construction is mirror image.
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Old 3rd Dec 2018, 08:50
  #23 (permalink)  
Man Bilong Balus long PNG
 
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Location: Back in the land of the Rising Sun for another three months of Glider towing, eating great Japanese food, perving on lovely Japanese Ladies and continuing that search for a bad bottle of Red.
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Devil

Complained many years ago that my Sierra had a prop shaft vibration at 135 mph.
Got it fixed under warranty.
Many many years ago (around 1975) I had a mate who had a very highly worked XBGT Falcon Coupe.

He once told me that at 150MPH the drivers side rear vision mirror was 'clear as a bell' whereas the offside mirror as a bit blurred.

The one night I drove it and we had 155MPH on the speedo I didn't even think about looking in the mirrors!!


The fuel consumption of that car was 3-4MPG around town and between 9 and 12 MPG on the open road.
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Old 3rd Dec 2018, 08:59
  #24 (permalink)  
 
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Originally Posted by Pontius Navigator View Post
Wingnut, the design might be the same but there is no guarantee that the construction is mirror image.
Yes I know.
But it's still a very typical case of people who don't know how to maintain a piece of equipment deciding that they know how to design one.
I've had fifty years of that. It irks me.
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Old 3rd Dec 2018, 09:26
  #25 (permalink)  
 
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Location: QLD - where drivers are yet to realise that the left lane goes to their destination too.
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So mirror now rattles at 110 kmh. Mate is speed limited to 100 kmh. Problem is...?
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Old 3rd Dec 2018, 09:26
  #26 (permalink)  
I don't own this space under my name. I should have leased it while I still could
 
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Originally Posted by WingNut60 View Post
Yes I know.
But it's still a very typical case of people who don't know how to maintain a piece of equipment deciding that they know how to design one.
I've had fifty years of that. It irks me.
The OP mentioned that although the design for the cable routing was the same the cable was not routed the same way.

I have observed two things along this line. Often a piece of plastic will have redundant features in its moulding and screw hole indents not open. In parallel a piece of cable etc is not routed using what appear to be intended channels or clips.

I suspect the latter occurs during assembly line processes where time runs out before the next piece arrives. I guess this happened with a car I had. Reassembling a component I dropped a large spacer into the depths. I removed some kit to retrieve it and discovered 4 such spacers. Clearly during original assembly the fitter had had the same problem.
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Old 11th Jan 2019, 06:07
  #27 (permalink)  
Thread Starter
 
Join Date: Jul 2008
Location: adelaide australia
Posts: 266
SOLUTION!


well, I led you astray and I must apologise, the source of the rattle has been found to be:



the rubber seal around the windscreen of the truck!



On the passenger side A pillar, the windscreen seal has become dislodged from it's slot. I discovered this when I held the pillar to work on the mirror and found the seal moved.

In my defense there's no way I could have known it was the seal without touching it. It visually appeared to be in place and the mirror mounts to the pillar and so the vibration is transmistted to the mirror. As soon as I wound down the window (at speed) the vibration stopped , probably due to changes in airflow across the seal.

The vibration was quite violent and the fact that a displaced seal could make such a vibration at 100kmh astounds me.
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Old 11th Jan 2019, 08:58
  #28 (permalink)  
 
Join Date: Apr 1998
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How old is the van? The windscreen on a modern vehicles is a structural item forming an integral part of the monocoque construction. Sometimes, more often than not, and including on my own 19 year old vehicle, the glue that holds the windscreen to the roof and A-pillars either fails or was never properly applied. What you do depends on how long you want to keep the vehicle considering that at any time you could get a chip in the glass.

My windscreen only makes small "moving" noises when going over bumps or cornering too fast, otherwise I happy to see it through until this 19 year old car eventually dies.
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