Undertray Poll - Page 12 - Renault Forums :: Independent Renault forum

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View Poll Results: Does You Car Have Its Main UNDERTRAY?
Yes, mine has and always has 61 82.43%
Yes, but it didn't when I bought the car 2 2.70%
No, and there wasn't one when I bought the car 8 10.81%
No, and it might be a dealer's fault it's missing 3 4.05%
Voters: 74. You may not vote on this poll

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post #56 of 70 (permalink) Old 20th September 2012
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Re: Undertray Poll

Shreds of a failing timing belt get caught in the crank pulley and wedge themselves between the pulley and the timing cover and force their way inside. The plastic cover not being strong enough to resist such force will also bend or break at this point.
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post #57 of 70 (permalink) Old 2nd September 2014
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Re: Undertray Poll

It's true! Friend of mine was recently telling me that exact same thing happened to his Megane. It had had new timing belt, then original aux. belt was put back on. Later the aux snapped, smashed the timing belt's lower plastic cover, got inside and jammed the timing belt, which stripped some teeth which in turn then bent all the valves. It's "a recognised Renault thing".

OK so you've taken your cover off. Now imagine finding yourself on a road that has just been resurfaced with new chippings. And you know how these days the contractors leave it to the cars and trucks to steam-roller the loose chippings into a solid layer, instead of using real road rollers. I wouldn't like to risk it.

I think it might have 3 functions actually:

1. shield the belt(s) from chucked-up debris (stones and chippings).

2. sound deadening (environmental noise pollution issue ~ I'm sure somebody somewhere has decided what the max. allowable decibels have to be).

3. (my favourite) to prevent road spray getting into the electronics in the engine bay and the sensors around the engine.

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post #58 of 70 (permalink) Old 26th January 2015
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Re: Undertray Poll

It also helps with aero dynamics.. so add that to you list as well..
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post #59 of 70 (permalink) Old 26th January 2015
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Re: Undertray Poll

With his post above.
Also, It stops Oil contaminating the drive & badly serviced Diseasels chucking their foul fuel under motorcyclists tyres. Certainly saved me a concrete clean up when my drive shaft seal didn't line up nicely.
An absolute PITA each time it has to come off, but IMHO worthwhile. Renault wouldn't spend that much fitting one, if it wasn't worth it being there.

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post #60 of 70 (permalink) Old 26th January 2015
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Smile Re: Undertray Poll

hi, just re fitted mine for the 10th time ! since I've owned the car, so you can guess my millage. Can't see what the fuss is about they only take 5 mins to remove and about the same to re fit.
I put copper grease on the bolts the first time I removed them and add a bit more when necessary after that. I don't seem to get much debris up under there few dry leaves is about all. I did notice it has a few scrapes on the underside so those speed bumps must have got me at some point, better than catching my sump !.

Some mention the aux belt catching up under the cam belt cover, ouch happened to me on my last Peugeot (1.9TD) aux belt broke went up under and did its best to spoil my day, luckily all it did was put the pump timing out which stopped the engine, crank and cam timing was ok phew! but it did break the casting of the aux belt tensioner which was an absolute PITA to fit in the rain on the street.

I vote to retain the under tray cover.

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