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vnt turbo actuator rod

Discussion in 'Diesel forum' started by olds_kool, Feb 15, 2009.

  1. olds_kool

    olds_kool Active Member
    VCDS Map User

    Jul 21, 2007
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    removed and stripped my turbo today to investigate a lack of power problem (99 a4 afb 2.5 tdi, garrett vnt20)

    ive given it a good good clean and vnt internals work perfectly now
    but my question is how far should i be able to move vacuum actuator rod? ive attached a hose and sucked as hard as possible and it moves rod about 1cm, and pushing rod by hand takes a hell of alot of force to move past the 1cm, is this right?
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  3. evomaster3000

    evomaster3000 Member

    Dec 8, 2004
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    1 cm is right, mine was also stiff, i've recently done a turbo de-coke aswell.

    The actuator i gave a bit of an oil on the underside bit and moved it a bit to make sure it all moves ok and just make sure nothing is stuck.

    They only move a small bit to give a radical difference in boost, just don't undo or mess with the threaded bar as this is set at specific boost.

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