Reinstalling the rear under tray / shield on your DB9 is easy. I am assuming you’ve already removed it for some other service task (like changing your rear differential fluid), and you can check out my previous post and video on how to remove the rear under tray.
While I had the tray off my car, I took the time to clean it up so it looked good as new. This was simply using my pressure washer to clean it off (you could use a hose and a scrubby brush equally well), and then after it was dry I treated it to an application of Meguiar’s Ultimate Black Plastic Restorer to make it look as good as new. Check out the results!
The only tools you’ll need are the same as taking it off the car, a T30 Torx socket.
Installation is simply holding the tray up in place (it’s light so this isn’t very hard) and reinstalling the nine (9) T30 Torx screws (Aston Martin P/N 6G33-100134-AB available for about $0.35 each online if you’ve lost one). I put one in the center of the back row first loosely, then one in the middle of the front row to hold it up while I crawl around under it doing the rest. Don’t tighten any of them until you have all the screws started (you may need to wiggle it around a bit to line up the holes).
I couldn’t find a specifically listed torque spec in the Official Aston Martin Workshop Manual (there is no section on removing the under trays surprisingly since its referenced at least 20+ times), but in the back they listed the generic torque for an M8 screw (which these are) as 10 Nm (7 ft-lbs). [If someone knows better – please comment so I can update this] I used my judgement and went with firmly snug since the tray is just HDPE plastic.
Here is a short video of the process I followed:
2 thoughts on “Installing the Rear Under Tray on an Aston Martin DB9”
Firstly, many thanks for the time and effort you must spend on this site! So much excellent info.
I have just bought my first Aston Martin, a 2009 DB9 V12 6.0 litre TT2 470 bhp and I absolutely love every thing about the car.
For me, it is the realisation of a lifetimes dream and I am not disappointed!
I have always serviced and maintained my own vehicles and wish to continue doing so with the DB9 – your excellent videos and guides give me the confidence to do so!
Anyway, introduction aside, the reason for this post is an answer to the requested undertray screw torque values! The details are shown in a diagram on page 646 (20-1-32) of the DB9 Workshop manual. I would add the pdf image but there appears no facility to do so.
Feel free to pm me for any info if needed.
Just a (very) small input, hope it is of use
Best wishes Mike
UK DB9, currently in France
Hi Mike,. My manual doesn’t have that many pages, so I suspect you have something better since its a 2009. If you could email me something at Steve@Aston1936.com it would be cool to see what they have included.