Howto: changing spark plugs

[Cuthbert]

This Howto is intended to be a guide to changing the spark plugs on a Twin Turbo Supra

Tools & equipment need:

6 x spark plugs
Allen key - 5mm
Torque Wrench (not essential, but preferable)
Spark plug socket head
Socket wrench
Small wrench extension bar (~3&quot
Copper grease


Firstly, with reference to the following picture, remove the bolts marked using the allen key. Remove the oil filler cap & then remove the plastic cam cover:




You will now be able to see the coil packs & their associated cables.
Replace the oil filler cap.
Remove the 2 PCV hoses marked in the next picture. It is a good idea at this point to replace these for new ones as the originals may well be quite old & brittle.
Now undo the retaining clips which hold the wires to the coil packs in place (marked in picture) & move them to the side, there will be 3 sets of 2 clips:





Undo the connectors to the coil packs, there are 6:





You should now be able to move the coil pack wires fully out of the way & to the side.
Undo the bolts holding the coil packs in place, 2 each end of each coil pack - 3 coil packs:





Remove the coil packs taking note of their orientation.
You will now be able to access the spark plugs.
Remove the spark plugs using the socket wrench, extension bar & spark plug socket head.
Fit the new spark plugs, smearing a little copper grease on the threads of the plugs. Torque the plugs to 13ftIb
If you don't have a torque wrench, tighten the plugs up until you feel the point of resistance (i.e. where the thread starts to tighten), then give them a 1/4 turn.

Refit the coil packs & their bolts, reconnect the cables to the coil packs & locate the cables into their retainers.
Fit the new PCV hoses, replace the plastic cam cover & refit the bolts holding it in place.

[Cuthbert]

All done, if anyone spots any mistakes, please let me know.

[Dave3man]

Thats saved me some money

[Cuthbert]

Yep it's a doddle, first time = 1hr max. If you've not ventured under the bonnet before & have no idea what to do it can be a bit daunting, even on something as simple as this.

[Martin F]

Good write up

Changing them on an NA is a bit more involved

[Cuthbert]

I remember a few years back when my work mate 'trounced' my new honda with his new N/A, I took a look at the engine & winced at the thought of changing the plugs. That said though, some cars are a lot worse.

[UltraFlynn]

My old FTO used to be a sod to change the rear three of the spark plugs (apparently). You had to remove the whole intake assembly and even then it was a pain.

[Gambit]

I'm after the part number for the grey clips that hold the harness in place, between the cam covers???
FOUND IT.

[Martin F]

Good Luck on that on ! The EPC is a bitch for those sorts of things.

If I remember correctly those clips have a number or a letter on them, do you know what that is and I'll see if I have any sitting around.

[Gambit]

I searched for them here. http://www.mkivsupraownersclub.com/f...&highlight=cam

It is the same as this one.



And I think it is this... Will let you know on Monday.