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post #6 of (permalink) Old 1st February 2008
Technical Supremo

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The captive nuts for the undertray bolts are notorious for failing - the simple answer is to drill a new hole alongside the existing ones and fit a self-tapper - the hex-head ones are best - see samples in the link below.
Sometimes they also refuse to unscrew and the easiest method of removal is to grind the heads off using an angle grinder. Don't forget to apply some copper grease (anti-seize compound) - you'll be glad later. Thankfully I solved the probelm of having to remove the undertray during oil changes - I cut a wee door (about 6" square just below the drain plug and secured it with nylon cable ties - now each time I just cut two of the cable ties and replace when I'm finished
Under no circumstances should you risk running the car without the undertray - the risk of stones, debris and water getting into the engine bay is too risky

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Last edited by madnoel10; 1st February 2008 at 02:16 PM.
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