The Spark Plug Covers on a DB9 are used to shield both the Coil Packs and the Spark Plugs inside the valve cover. All this is situated underneath the intake manifolds, so it’s a bit of a phaff to get to them. You may need to remove the covers in order to change the Coil Packs or Spark plugs (like I am) or perhaps you are fixing a leaking valve cover gasket or something deeper in the engine. Either way, it’s a pretty simple process.I’ve done a lot of work already getting to this point, including the steps detailed in these other posts and videos:
- Depressurizing your fuel system (so you don’t start a fire)
- Disconnecting your Battery (also so you don’t start a fire)
- Covering your fenders (so you don’t screw up your paint)
- Removing the Engine Bay Cross Braces (because it’s in the way)
- Removing the Intake Manifold Brace (because it’s in the way)
- Disconnecting the Fuel Rails and removing the Fuel Injectors
- Disconnecting all the other ancillary components attached to the manifolds
- Removing the Intake Manifolds
- T20 Torx Socket
- A suitable ratchet
- A suitable nut driver to make the process go faster
The official Aston Martin Workshop manual section on Spark Plugs covers it in step 2 “Remove the spark plug cover”. Succinct.
Here’s my slightly more verbose version:
- All you really need to do it remove the ten (10) T20 Torx bolts per cover. Way to go Aston, so you think 10 bolts was enough?
- Use your T20 Torx socket and ratchet to crack them loose, then use the nut driver to speed the process removing them (they are kind of long).
- Set the bolts and over aside, and be careful not to drop any of the bolts into the nearby intake inlets of V area of the block.
- Lift the cover away and set it aside.
- Repeat the process for the other side.
That’s it. Not a ton of extra advice to add to this simple step.
Here is a quick video of the process to check out how it goes.