Any 1.9 Experts know what this part is?

UK forum for general and technical discussion about the Z3 roadster
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RMCommando
Joined: Sat 04 Feb, 2012 17:29
Posts: 22

  Z3 roadster 1.9i
Location: Bournemouth

Any 1.9 Experts know what this part is?

Post by RMCommando »

Hiya guys, been having a lot of work done and noticed that there is a bit of a bearing noise coming from a specific area.. any know what this is?


cheers
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TitanTim
Joined: Mon 23 Jun, 2008 18:56
Posts: 5488

  Z3 roadster 1.9i
Location: Stafford

Re: Any 1.9 Experts know what this part is?

Post by TitanTim »

RMCommando wrote:Hiya guys, been having a lot of work done and noticed that there is a bit of a bearing noise coming from a specific area.. any know what this is?


cheers
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Where is the specific area? :wink:

Tim.
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2001 Z3 1.9 Roadster Sport - 2012 Z4 sDrive 2.0 M Sport
RMCommando
Joined: Sat 04 Feb, 2012 17:29
Posts: 22

  Z3 roadster 1.9i
Location: Bournemouth

Post by RMCommando »

just trying to put a pic on mate how do i do it?

cheers

the area is right next to the dipstick (to the right) and has two small rubber pipes into the bottom
RMCommando
Joined: Sat 04 Feb, 2012 17:29
Posts: 22

  Z3 roadster 1.9i
Location: Bournemouth

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Post by RMCommando »

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pingu
Joined: Fri 30 Apr, 2004 16:01
Posts: 3412

  M roadster S50

Post by pingu »

http://www.realoem.com/bmw/showparts.do ... g=11&fg=40

I haven't seen under the bonnet of a 1.9, so I can't help much, but it looks like it is something called an adjuster unit.
Pingu
RMCommando
Joined: Sat 04 Feb, 2012 17:29
Posts: 22

  Z3 roadster 1.9i
Location: Bournemouth

Post by RMCommando »

Thanks buddy, just sounds a bit like a worn bearing. do these even have bearings in?

cheers
RMCommando
Joined: Sat 04 Feb, 2012 17:29
Posts: 22

  Z3 roadster 1.9i
Location: Bournemouth

Post by RMCommando »

swamper wrote:hmm from what iv seen there all noisy :?
probably wrong and its just mine and yours :lol:
haha i'll leave it alone then :-)
swamper
Joined: Thu 13 May, 2010 17:14
Posts: 1866

  M roadster S50
Location: Mossley

Post by swamper »

hmm from what iv seen there all noisy :?
probably wrong and its just mine and yours :lol:
the badness makes me do it...!

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swamper
Joined: Thu 13 May, 2010 17:14
Posts: 1866

  M roadster S50
Location: Mossley

Post by swamper »

i might be wrong...but if you want to take it apart...you go 1st and i'll have a look at the pics :lol:

have we sussed out what it does ?
is it to do with the emissions?
the badness makes me do it...!

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RMCommando
Joined: Sat 04 Feb, 2012 17:29
Posts: 22

  Z3 roadster 1.9i
Location: Bournemouth

Post by RMCommando »

i may just do that along as their is no half perished gasket on it lol :-)
swamper
Joined: Thu 13 May, 2010 17:14
Posts: 1866

  M roadster S50
Location: Mossley

Post by swamper »

"half perished gasket " thats a reason for doing it :lol:
the badness makes me do it...!

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Del
Joined: Sat 19 Nov, 2011 18:35
Posts: 2136

  Z3 roadster 1.9

Post by Del »

Hi

I assume you’re talking about item 8 on the diagram.

This is sometimes known as a DISA valve (termed adjuster unit on the diagram). Briefly, it has a metal flap (valve) inside that moves, on a spring loaded spindle, to adjust airflow inside the manifold. It is wired to the ECU and is activated at a certain RPM (3500-4000 I believe). It’s all about optimising engine efficiency and power across the RPM range.

After a while the spindle holding the metal valve develops a “bit of play” and becomes noisier – a certain amount of buzzing is normal even from a new unit. Failure can also occur by the spring mechanism breaking so that the valve does not open/close normally.

The one on my particular 1.9 (M44 engine, 70,000 miles) was particularly noisy – even an ex-BMW technician agreed with me that it was so. The spring mechanism was working OK but I took the decision to replace it myself (very simple 5 minute job) at a cost of around £150 for a new unit from BMW. My understanding is that worst case scenario is that the spindle pivot end can become disconnected with the risk of bits falling into the manifold/engine.
RMCommando
Joined: Sat 04 Feb, 2012 17:29
Posts: 22

  Z3 roadster 1.9i
Location: Bournemouth

Post by RMCommando »

Thanks mate, appreciate the info. I just noticed it when i had the bonnet open, sounds like bearings so thought better to ask than not :-)
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