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  1. We here it every day.............. "My Turbo has too much play"

     

    Turbochargers are expensive so its understandable that vehicle owners are worried about play in the Turbos shaft.  We have these queries raised not just on old used Turbos and reconditioned/ remanufactured and even BRAND NEW GENUINE UNITS!!

     

    Turbocharger design means that the rotor assembly (shaft and impellers) float on a layer of oil during operation for efficiency, to keep temperatures down (spinning in some cases over 250,000rpm causes a LOT of frictional heat) and to ensure minimal wear.  In order for this to happen, a clearance is required between bearing to shaft and in the case of a floating bearing set up between bearing to housing also.  Different manufacturers have different clearances especially in differing specifications of their Turbochargers from a radial clearance of less than 0.2mm to over 1.1mm radial in others.  When the engine is running and oil pressure is present, these clearances are filled with pressurised oil, removing the free play and ensuring there is no direct component contact whilst in operation.

    When you "have a wiggle" the unit is cold meaning all the components are in their smallest state and there is no oil in the vital clearance areas, let alone pressurised oil.  This can result in a scary amount of play to the novice.

     

    OE manufacturers and professional turbocharger reconditioners spend large amounts of time checking dimensions dimensions and clearances at multiple stages along the build procedure and wont sign off a job unless the final product is in tolerance.... It would be suicidal as the unit would not only perform poorly, but would last a short time indeed.

     

    Turbo Rebuild, being a professional Turbocharger reconditioner for many years have the knowledge and experience to ensure your new or reconditioned Turbocharger is to the correct specification and together with our calibration equipment can ensure it performs 100%.  We are not a "fitter" type company that buys complete Chinese inferior cartridges with no production history etc and simply bolts them in the old housings.  We in many cases build units from scratch from component form right through the balancing stage and finally the calibration stage and log all data for future reference.

     

    This video shows a Brand New Garrett GT1749V Turbocharger from the Audi/VW 140BHP BKD engines.  This unit is unused and is the Genuine item.  Just take a look at the video of the play found.  Garrett GT units tend to have quite tight clearances compared to other units and still, theres a lot of play!

  2. "You get what you pay for" is a well known saying and applies to many industries especially in the Turbo Reconditioning world.

     

    A Turbo Rebuild done on the "Cheap" can not only be a waste of time and money..... It can be dangerous.....VERY Dangerous.

     

    Over the years we have seen some shocking repairs done on the cheap and to "save a few quid"  This can include reusing worn and damaged compressor wheels and Turbine shafts and in some extreme cases reusing bearings and seals.  Reusing ANY part that has signs of wear or damage is a waste of time.  Take the Turbo compressor wheel for example. "Its only rubbed against the housing a little"...........  By reusing a compressor wheel that has come into contact with the housing, the Turbocharger will now have to work harder to pump the same air as before.  This is due to the excessive wheel to housing clearance.  Working harder to achieve the same result will mean a drastic increase in wear and the lifespan of your unit, as well as higher air charge temperatures and oil temperatures reducing MPG and power.

    A Turbo part that can be dangerous to reuse especially in Turbo Diesel applications is the front oil seal and Seal Plate.  As diesel engine runs on refined oil, any oil leaking from the turbo can cause a "Run away" situation.  This is where the vehicle runs on the oil leaking from the Turbo and begins to rev.  The higher the engine revs, the more it sucks the oil through the Turbo.  Turning the engine off will not help as you are simply stopping the fuel entering the engine, but its not the fuel the engines running on! 

    If you are quick (and brave) you can stop whats about to happen by either stalling the engine by choosing a high gear (5th) and with the hand brake applied and foot on the foot brake release the clutch sharply (This will only work on a manual) or the scary option............ Pop the bonnet, pull off the air filter and push clothing or similar into the air intake pipework to stop air getting into the engine.  If you manage to do this we salute you as its pretty god damn scary attempting it.  Otherwise, get well clear and watch as your leaking Turbo results in a engine failure or in some cases a write off of the whole car if it catches fire.

     

     

    At Turbo Rebuild we:-

    NEVER reuse bearings and seals

    NEVER reuse a worn seal plate (infact in any rebuilds we now replace as a matter of course)

    NEVER allow a Turbo to leave our workshop unless it has passed testing

    ALWAYS supply vital cleaning instructions for boost pipework.

     

    DON'T TAKE THE RISK "BECAUSE ITS CHEAP!