26/02/2013
Matt Cleevely
Posts: 7
Reputation: 6
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Hi everyone, first post....so here goes!
I have had a couple of customers vehicles with turbo over or under boost fault codes, as i'm sure everyone has! I acted bravely and removed the Garrett variable vein turbo on a couple of these vehicles (after testing all control items) and stripped it down to check how the variable vein control is done. i found it is a disc that turns and opens/shuts the veins linked to the diaphram actuator. I found the disc had seized on one and on the other it would stick at 'full boost'. I removed and cleaned the excess carbon and corrosion from around the disc/veins and used Kent Ceramic 1200 vht grease. Rebuilt the turbo and kept my fingers crossed!  So far both turbos are still whizzing away and i have two very happy customers!
So if you get the same symtoms then be brave and give it a go. Matt
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27/02/2013
Guest
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Good feedback, all info posted could help other members.
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03/10/2013
Progress
Posts: 2
Reputation: 1
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I had a similar fault on a golf, removed turbo and stripped it but I could not get it to clean satisfactorily, I sent it to a local turbo specialist and had it cleaned and re assembled for £150.00, re fitted and it works like new, so we do not need to replace the turbo every time!
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02/02/2015
penguin
Posts: 1
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ive not tried it personally but i know of another garage that swears by Mr Muscle oven cleaner! you still have to strip the turbo off, but there cant be much difference between baked on carbon in an oven or turbo!
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10/09/2015
DaveH
Posts: 1
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Moving image of a variable vane turbo.
http://www.technologie-entwicklung.de/vtg-sequenz.gif
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