DISA VALVE

UK forum for general and technical discussion about the Z3 roadster

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Southernboy
Joined: Thu 07 Oct, 2010 13:39
Posts: 6312

  Z3 roadster 3.0i
Location: Johannesburg

DISA VALVE

Post by Southernboy » Tue 10 Feb, 2015 09:13

This is a reminder to all you guys to take 10 minutes to remove and check your DISA valve on your motors. It is a serious weak link in the BMW design, it will have a direct effect on performance, and in some instances will destroy your engine to the point of requiring a replacement motor or a re-build.
The main problem with the OEM components are poor plastic parts which wear out, crack and fragment...these parts will be able to get into the cylinders. Perhaps of greater concern is a steel pin which can also fall out and if that gets into the motor you will have some issues.
Removing it is very simple - 2 x T4 torx screws and an electrical connector. You may also need to remove the air intake box to access those 2 screws. I have posted a link to youtube where you can see how to remove t and what to look for as an indication to wear etc... The video describes the DISA on a Z4, but the Z3 is identical (on 6cyl cars)
https://www.youtube.com/watch?v=ZNYUhWk6WUc
"Normal is overrated"
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maurice the martian
Joined: Tue 26 Jan, 2010 19:44
Posts: 1026

  Z4 roadster 3.0i
Location: mars

Re: DISA VALVE

Post by maurice the martian » Tue 10 Feb, 2015 09:27

Agree with you on that one, changed mine about 2 months ago on mi Z4 M54, whilst mine had a little play , thought I would change it anyway , bought an uprated kit from a firm in Sheffield, £55- half hour job , well worth it not to blow your engine, an actally its doing better mpg
Moz

Del
Joined: Sat 19 Nov, 2011 18:35
Posts: 2122

  Z3 roadster 1.9

Re: DISA VALVE

Post by Del » Tue 10 Feb, 2015 09:45

The 4 pot cars also have one although they are a different shape and unfortunately no repair kits are available. Mine was making a noticeable buzzing rattle noise when I first got the car. New BMW OE one around £150. It's the black plastic item on the side of the inlet manifold just in front of the ABS pump. Simple to change with easy access.

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TR4man
Joined: Wed 24 Oct, 2012 14:34
Posts: 431

  Z4 coupe 3.0si
Location: Woore, Near Nantwich, Cheshire

Re: DISA VALVE

Post by TR4man » Tue 10 Feb, 2015 12:50

That's an interesting tip.

Have to admit I've never heard of it until now. Is there a way of knowing if it is faulty before taking it off i.e. how would I know if it needs replacing?

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Southernboy
Joined: Thu 07 Oct, 2010 13:39
Posts: 6312

  Z3 roadster 3.0i
Location: Johannesburg

Re: DISA VALVE

Post by Southernboy » Tue 10 Feb, 2015 13:00

Have a look at the video link I posted...really easy off. Then check the flap for excessive play, and also if it still has a return spring in it. Finally, have a look on the "underside" (side facing the inlet manifold) there is a tiny hole there which must be clear and free of any blockage. If there is any play, in the flapper, you will need to get a repair kit. There are options...the repair kit has been "upgraded to aluminium parts" which won't degrade like plastic. Have a look on this link under BMW Solutions. They sell the "upgraded" version as does i6 Auto in the UK off eBay. The German option allows for an upgraded rubber O ring seal for an extra $5'ish... excellent quality items there.
http://www.germanautosolutions.com/index.php
"Normal is overrated"
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Fender2004
Joined: Fri 14 Aug, 2009 11:24
Posts: 877

  Z3 roadster 2.8
Location: Houghton-Le-Spring

Re: DISA VALVE

Post by Fender2004 » Tue 10 Feb, 2015 14:03

So the M52 engine has this valve?
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Southernboy
Joined: Thu 07 Oct, 2010 13:39
Posts: 6312

  Z3 roadster 3.0i
Location: Johannesburg

Re: DISA VALVE

Post by Southernboy » Tue 10 Feb, 2015 14:19

......... Yep...and it operates exactly like the M54 unit. You can google "BMW M52 DISA VALVE"
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Brian H
Joined: Tue 16 Dec, 2008 19:55
Posts: 2503

  Z3 roadster 3.0i

Re: DISA VALVE

Post by Brian H » Tue 10 Feb, 2015 14:30

Original DISA thread here: -

http://www.zroadster.net/forum/viewtopi ... disa+valve

Some helpfull M54 rebuild instructions here

Rebuild Instructions

Rafolian
Joined: Wed 27 Feb, 2013 08:41
Posts: 547

  Z3 roadster 2.8

Re: DISA VALVE

Post by Rafolian » Tue 10 Feb, 2015 18:13

Am I correct in assuming (think I read it somewhere) that the single vanos 2.8 doesn't have one, only the twin vanos?

Rafolian
Joined: Wed 27 Feb, 2013 08:41
Posts: 547

  Z3 roadster 2.8

Re: DISA VALVE

Post by Rafolian » Tue 10 Feb, 2015 18:20

Sorry, just read an earlier post and it doesn't apply to my single vanos 2.8, one less worry!

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