Diesel Diagnostics

Back to Forum

Post a Response

Variable Vane Turbos - General question #

Posted by Andy Bracher on September 4, 2010, 7:54 am

Year of Manufacture *: All
Engine Size and Code *: All

Hi All ,

When checking for sticking vanes on a Variable Vane turbo does it follow that if the external operating arm moves correctly that the vanes inside will also be moving ok? Conversly if the vanes are sticking will the arm be stiff to move or appear seized.

Sorry if the answer to this appears obvious to many but I haven't had the opportunity to see inside a VV mechanism yet!

Thanks

Andy

Re: Variable Vane Turbos - General question

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on September 4, 2010, 9:03 am, in reply to "Variable Vane Turbos - General question"
Mark Carter

HI Andy, the short answer is Yes.

A mityvac is a good tool for checking the operation of the VGT system.

Once you are happy that the actuator appears to be working correctly Connect a suitable diagnostic tool and locate boost pressure in actual data.

Start the vehicle and run the engine at about 1300 Rpm (you may need an assistant),then operate the mityvac and watch the boost pressure change.

The boost pressure rise should be smooth and in relation to the vac applied.

Regards mark

PS. Do not try this test at higher engine speeds.

Modern cars, Its all wizardry and witchcraft

Re: Variable Vane Turbos - General question

Posted by Andy Bracher <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3073' width='330' height='300' border=0 style='border:none;'> on September 4, 2010, 10:10 am, in reply to "Re: Variable Vane Turbos - General question"
Andy Bracher

Hi Mark,

Thanks for the quick reply & test procedure.

Regards

Andy

Re: Variable Vane Turbos - General question

Posted by Martin Wainwright on September 4, 2010, 6:00 pm, in reply to "Re: Variable Vane Turbos - General question"
Message modified by board administrator September 6, 2010, 4:15 pm

Good information here Andi
http://www.myturbodiesel.com/1000q/a4/VNT-wastegate-adjust.htm
Hope this helps Martin.

Re: Variable Vane Turbos - General question

Posted by tony bickers <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5143' width='330' height='300' border=0 style='border:none;'> on September 4, 2010, 10:26 pm, in reply to "Re: Variable Vane Turbos - General question"
Tony Bickers

To add to Martins link, this shows a VNT sripdown and rebuild

http://www.technologie-entwicklung.de/Gasturbines/VNT15-Turbo/body_vnt15-turbo.html

Re: Variable Vane Turbos - General question

Posted by Andy Bracher <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3073' width='330' height='300' border=0 style='border:none;'> on September 5, 2010, 2:53 pm, in reply to "Re: Variable Vane Turbos - General question"
Andy Bracher

Interesting links , thanks again to all who replied.

Andy

« Back to index

[ Diesel Diagnostics ]

Copyright © uk autotalk