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It has come to my attention that a number of E90 N47s are loosing boost. On many occasions it is the actuator control arm on the turbocharger which siezes. This requires a repair kit with a new rod. However on newer engines i have noticed on numerous occasions that the actuator control arm has come away completely, simply due to a faulty C-Clip coming away.
To diagnose this all you need is a torch. Firstly locate the turbocharger which will be on the drivers side (RHD vehicles). As you look between the wing and the engine block you will see the exhaust manifold, attached to which is the turbo. Now at the moment i am struggling for a photo or diagram to show the exact position of this arm, but its pretty easy to spot. Firstly find the actuator which looks something like this..
http://www.atpturbo.com/Merchant2/graphics/00000001/Catalog Images/Wastegate/ATP-WGT-028_450.jpg
In this photo you see the control arm to the right. Once you have found this, make sure it is attached to something. If not then thats your cause for loss of boost.
To make the repair you need to slip it back over the lug and attach a new c clip like the one on the far right of this photo
http://faq.f650.com/FAQs/Photos/ChainPhotos/SnapRingEclip.jpg
A box of different sizes can be easily purchased from any motor spares shop.
Problem solved hopefully. I will try and get better photos and diagrams later.
Note, this fault doesnt bring up a warning light.
To diagnose this all you need is a torch. Firstly locate the turbocharger which will be on the drivers side (RHD vehicles). As you look between the wing and the engine block you will see the exhaust manifold, attached to which is the turbo. Now at the moment i am struggling for a photo or diagram to show the exact position of this arm, but its pretty easy to spot. Firstly find the actuator which looks something like this..
http://www.atpturbo.com/Merchant2/graphics/00000001/Catalog Images/Wastegate/ATP-WGT-028_450.jpg
In this photo you see the control arm to the right. Once you have found this, make sure it is attached to something. If not then thats your cause for loss of boost.
To make the repair you need to slip it back over the lug and attach a new c clip like the one on the far right of this photo
http://faq.f650.com/FAQs/Photos/ChainPhotos/SnapRingEclip.jpg
A box of different sizes can be easily purchased from any motor spares shop.
Problem solved hopefully. I will try and get better photos and diagrams later.
Note, this fault doesnt bring up a warning light.