Replacing spark plugs

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lightning
Joined: Tue 27 Nov, 2007 08:15
Posts: 814

  Z3 roadster 3.0i
Location: Stockport

Replacing spark plugs

Post by lightning » Sun 06 Sep, 2015 08:53

How easy/difficult is it on the 3.0? Most other maintenance items are easy on this model, but l took off the engine cover and cannot even see them.
I assume they have individual coil packs.

johnz3
Joined: Wed 13 Sep, 2006 11:27
Posts: 670

  Z3 roadster 3.0i
Location: Pitsea

Re: Replacing spark plugs

Post by johnz3 » Sun 06 Sep, 2015 09:17

Going to do that myself in a couple of weeks time so would appreciate peoples advice. Thanks

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Brian H
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Joined: Tue 16 Dec, 2008 19:55
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  Z3 roadster 3.0i

Re: Replacing spark plugs

Post by Brian H » Sun 06 Sep, 2015 09:49

No too difficult a job, just be methodical. The 3.0 uses individual coil packs so with the top cover removed start at one end and work along to the other. The coil packs unplug and IIRC there are two bolts/nuts holding them in place, there is also a separate earth wire that needs to be disconnected. The coil pack nearest the bulk head is tight to come out but does come out. Once the coil pack is out of the way just change the plugs as usual.

johnz3
Joined: Wed 13 Sep, 2006 11:27
Posts: 670

  Z3 roadster 3.0i
Location: Pitsea

Re: Replacing spark plugs

Post by johnz3 » Sun 06 Sep, 2015 11:31

Thanks Brian

Del
Joined: Sat 19 Nov, 2011 18:35
Posts: 2119

  Z3 roadster 1.9

Re: Replacing spark plugs

Post by Del » Sun 06 Sep, 2015 11:58

One of the better youtube videos doing it on a BMW M54 engine - but not a Z3 so suspect the air filter box is placed differently in the Z3.

https://www.youtube.com/watch?v=sjAojOoi_ZQ

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lightning
Joined: Tue 27 Nov, 2007 08:15
Posts: 814

  Z3 roadster 3.0i
Location: Stockport

Re: Replacing spark plugs

Post by lightning » Sun 06 Sep, 2015 19:41

Thanks for the replies. Looks easy enough after doing the same job on my Ferrari Mondial t. That was really scary but in the end not difficult.

Can somebody tell me the correct plug type? I looked on Ebay and most are offering NGK, but more than one type depending on the seller!

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Tufarlian
Joined: Sat 14 Mar, 2009 20:21
Posts: 267

  Z3 roadster 3.0i
Location: Cheshire
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Re: Replacing spark plugs

Post by Tufarlian » Mon 07 Sep, 2015 08:50

I have a 3.0lt

It takes 6 x NGK BKR6EQUP platinum spark plugs.

The job is easier if you use a long tube plug socket. If you use a normal plug socket and extension (like in the video) then the socket tends to stay on the spark plug when you've tightened the new spark plug.

Take a look at this http://www.ebay.co.uk/itm/WT-3-8-DR-LON ... 20df7f20ce

Vince70
Joined: Sun 08 Mar, 2015 12:51
Posts: 57

  Z3 roadster 1.9
Location: Battle

Re: Replacing spark plugs

Post by Vince70 » Tue 08 Sep, 2015 09:18

I found doing the spark plugs on my M44 really easy as BMW have fitted a coil pack lead removal tool under the cover and each lead is actually numbered and I believe in the boot toolkit there's a plug removal socket but I wanted to use my Halfords Pro range socket as I rarely get the chance to use it lol..

You have to give it to BMW you might not get much in the way of toys for your money when buying a car but not many manufacturers would supply tools for ease of maintenance at the end of the day..

I don't know if it's right or not but when I refit my new plugs I always put a very very small amount of copper slip on the treads of the new plugs so as when I want to change them again in the future you know you should be able to get them out again without finding them welded into the head..

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lightning
Joined: Tue 27 Nov, 2007 08:15
Posts: 814

  Z3 roadster 3.0i
Location: Stockport

Re: Replacing spark plugs

Post by lightning » Sat 26 Sep, 2015 17:37

I changed the plugs today (3.0 engine) and it took about half an hour.

The engine is very well designed, and the job was easy to do. The old plugs looked reasonable but l think they were the originals.
The car has only done 55,000 miles and they are supposed to be changed at 60,000.

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