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981 spark plug change

BoxsterLL11

PCGB Member
Member
After having changed the drive belt yesterday, next job was the spark plugs.
Access is very limited so anyone with large hands might struggle.
Again, I viewed a few videos on youtube first.
I removed the wheel arch front section liner just to improve access to the front plug.
I was expecting to see an aluminium heat shield between the cat and the coil packs as per videos seen but mine didn't have one (have only done drivers side today).
Only fiddly bit I found was removing the coil pack connectors but I used one long screwdriver to release the connector catch and another to push the connector away from the coil pack.
Old plugs came out very easily (were last changed 4 years by Porsche Centre).
Rear plug is straight access with a few socket extensions, front two need a short extension down the spark plug tube, a UJ, then another long extension.
Middle plug has the most restricted access of all three, I had to put the spark plug socket and short extension down the spark plug tube first, then fit the UJ, then the long extension.
I fitted the new plugs by hand until they sat on the seal washers using socket/short extension.
Plug torque setting is supposed to be 28 Nm (21 ft lbs) but you can't use a torque wrench through a UJ as this will affect the point at which it clicks.
The only plug you could use a toque wrench is the rear plug as it has straight access using two extensions.
So rule of thumb, seat plug by hand then tighten up to 90 deg.
Did this on all three and checked the rear plug with my torque wrench and it clicked at 28 Nm with no further tightening so probably 90 deg from hand tight is ample.
Will put up a few pics.

The plugs I used where Bosch FGR5NQE04.
I had these from when I had my 2.9 987 gen II Boxster but never got round to fitting them.
I spoke to my local indy a few weeks ago about getting the car serviced soon as it is due a major and I mentioned I was going to do the plugs myself with the plugs I had for the 987.
But I was informed that the plugs are different for the 987 and the 981, different reach he said.
I said that my internet research revealed that they use the same plugs.
But no, I was told they are different.
Not so, the plugs I removed are the same as the ones I had for the 987.

Was going to do the passenger side tomorrow but on refitting the wheel my locking wheel nut key failed so have had to order a replacement from Porsche which is arriving on Thursday hopefully.
 
Old and new plugs.
The old plugs have only done about 12,000 miles since being fitted but I understand the importance of changing them regularly is not primarily to do with plug condition and performance but more to do with the fact that having steel plugs in an alloy head, if left in too long they can be very difficult to remove and worse case scenario is that the plugs will shear off which is an engine out job to fix.
 
BoxsterLL11 said:
Was going to do the passenger side tomorrow but on refitting the wheel my locking wheel nut key failed so have had to order a replacement from Porsche which is arriving on Thursday hopefully.


Same happened to me a while back with my CR, my fault - did not seat the `soft` key correctly. Replaced with standard bolts ... which are now on their third car :p

When it happened the OPC lent me their `master` ... there were / are only a few different designs of key
 
Same happened to one of my son's who has a Macan but suspect his was due to tyre replacement fitter using a windy gun on the locking wheel nut key.
The place I go to for my tyres have, when I take the car to them, always remove and fit all the wheel nuts on my car by hand and not by using the windy gun.
 
Well today I have done the passenger side spark plugs.
For some odd reason there seems even more restricted space.
For example, you cannot get straight run of extensions to remove the rear most spark plug as a UJ is needed whereas on the drivers side you can.
There seems even less space to get at the front two plugs which doesn't affect the actual removal of the plugs but more so removing and fitting the coil packs torx retaining screw and getting the coil packs cable connectors back on. And getting the spark plug socket and short extension on the middle plug is best done by putting those on first and get them in place, then the UJ and then the long extension.
Back of hands are cut to bits due to the sharp edges of the cat heat shield.

One definite tip though, when putting the plugs back in, remove the rubber/foam insert from inside the spark plug socket which grips the spark plug insulator as when fitting the plugs and you pull all the extensions out, the socket gets left behind. So take this out, fit the plug with socket/short extension by hand until seated, add the UJ and long extension and nip up.
The passenger side old plugs were not very tight to remove so once the new plugs are seated, just a nip is needed so I just used a ratchet and I bet I didn't even tighten 45 degrees.

Next job - oil change.

Pic shows access to nearside plugs.
 

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