Advice needed: Replacing spark plugs 928S - Spider off?
 

I'm replacing the spark-plugs of my 1984 928S Euro.
It looks like for the rear ones I need to remove the spider. Is this correct?

I have the workshop mauals, but for some reaons (28-67) it only shows something about replacing the 32V.

When I remove the 'spider' can I get away with removing only the middle section, or do the 'arms' need to come off as well. I presume if they do I'm going to need to replace the gaskets there as well?

Any WYAT for this one (will replace the hoses with silicone ones at the same time).

tia

Pauwl

Pauwl,

you do not need to remove the intake to replace the spark plugs, however you may remove the air cleaner and the air cleaner tubes.

if you are going to remove the intake (plenum and spiders), you should remove it as one assembly. just unbolt the spiders from the heads, loosen the air hose clamp between the underside of the plenum and the throttle body, and it will lift off in one piece. don't for get to detach the vacuum line on the driver's side of the plenum---the one that you were having trouble with.

as far as the vacuum lines are concerned, only remove and replace one at a time.

--Russ

Pauwl:

No you do not need to remove the spider. You will need a long 3/8 extension and something to pick up the plug when its loose. Look real close with the air inlet tubes off and you will see where the spider bends just enough to get the extension down there.

Brian

Thanks all.

4 front ones down, 4 to go. Will indeed be easier to remove air intake , so will do so. Just waiting for rain to stop, and hopefully sun to come out. It's 4 degrees centigrade here, wind, rain.

No garage, so just wait...

I needed a telescopic magnetic tool to pick up bit falling about the place - don't start this job without one IMHO.

I've gone for Copper plugs by the way (Bosch). In Europe they cost $5.80 per piece. I looked into the silver ones, they cost $18.20 a piece.

An I read about you guys getting the copper ones at around $1.... :(

And then gasoline at $1.95 per LITRE.... Ah well, at least I live close to the Autobahn and no speed limit :D

You don't need to remove the spider at all. In fact, changing the spark plugs on this car is easy, takes about an hour. Do you have the special spring-loaded spark plug tool that Porsche added to the rear tool kit?

N

Normy,

I think the tool was added after my car was made ('84). Don't have it unfortuantely.
Still waiting for the sun to come out to finish the last 4 :(

That tool is a must for getting to the plugs...you should track one down. Gap the plugs to about 0.030" or so.

it is best to take the plastic part of the airbox off, but no need to remove the spider. factory tool is not required.

I haven't used an OEM tool yet----

any standard 13/16" spark plug socket, a universal joint, 12 inch extention, and ratchet---all 3/8 drive--- will get the job done.

Gap plugs at .035", not .030

---Russ

Err.... guys, I'm metric over here :)

The spark plug socket I'm using is OK, am gapping as per my manual, which (once converted to inches) does land up at .030 (just over).

It seems to run fine now. What would happen if the gaps are too small? what should I notice?