Under Tray - Civinfo
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post #1 of 10 (permalink) Old 20th July 2019, 15:50 Thread Starter
 
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Under Tray

Just before my holiday, 30 miles away from home on motorway suddenly something "under" my car started scratching the road so once I had a chance to stop I noticed front of my under tray gone off...... Had no jacks as I left it in my old car decided to go on kerb so I could go in and temporarily fix it.. I bent it and placed under plastic thing..






Got a new one from coxmotorparts 46 today however no fixings with it(2.5 each, need 7). Any ideas if I could use the old ones? Car jack will be enough for me to slide under and fix it myself? It's an easy enough job for me to do myself but idk if I fit under haha
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post #2 of 10 (permalink) Old 20th July 2019, 18:01
 
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These are essentially fast-access service hatches. So they should just slide/come out once unscrewed.

If the fasteners are still present, it probably isn't worth renewing - UNLESS it was the failure of one that led to the damage. Probably worth a spray of Zinc rich primer on each fastener as they seem to be rusting nicely.



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post #3 of 10 (permalink) Old 20th July 2019, 18:03
 
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Addendum:
No great departure from the demo below:



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post #4 of 10 (permalink) Old 20th July 2019, 22:33
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Quote:
Originally Posted by Chasesdragons View Post
If the fasteners are still present, it probably isn't worth renewing - UNLESS it was the failure of one that led to the damage. Probably worth a spray of Zinc rich primer on each fastener as they seem to be rusting nicely.
Seeing how often these undertrays (And especially the screw-areas) are rusting up, it's rather tempting to pop it off and give it a quick rattle can (Or even a powdercoat...)
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post #5 of 10 (permalink) Old 21st July 2019, 16:35
 
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Perhaps it was just as well you didn't have the jack with you to crawl under.
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post #6 of 10 (permalink) Old 22nd July 2019, 07:13
 
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My mechanic removed mine completely without me knowing. Do you think it helps with aerodynamics / engine temp Much ?
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post #7 of 10 (permalink) Old 22nd July 2019, 10:46
 
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The undertray performs several functions, protection from stones etc, general road dirt, airflow for cooling and airflow for aerodynamics etc

It should definitely be fitted, dont be tempted to leave it off
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post #8 of 10 (permalink) Old 22nd July 2019, 11:54
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Whenever I service mine I dunk the screws in some of the old oil to stop them rusting. Then a good wipe down once screwed back in.
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post #9 of 10 (permalink) Old 22nd July 2019, 12:53
 
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They might be "sacrificial" to stop the aluminium or whatever undertray rusting. Another way might be to install thin pure Zinc washers to take all the "electrolytic load"

Regardless, the tray probably forms an important part in these modern cars, keeping the temps stable etc. Removing might not go unnoticed.

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post #10 of 10 (permalink) Old 26th July 2019, 07:02
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The exact same happened to me.

You can get the screw and nuts fairly cheaply. Search for U-nuts or speed fasteners. I got some ‘pearly wot nots’ from my local car parts place for about 50p each with bolt. Drilled a few new holes in the plastic tray and aluminium as the original holes had become unusable, now its more secure than new and i can buy replacement ones cheaply.
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