Related Audi S6 Timing Belt Replacement for 4.2L 40 Valve Engine

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What to replace while changing the Audi S6 timing belt on the 4.2L 40 valve engine.

Audi S6 Timing Belt Replacement Diagram 4.2L
IMAGE DESCRIPTION Apart from the timing belt, the Audi S6 4.2L 40 valve engine's timing belt system consists of 6 serviceable timing belt components. One is the water pump that is driven by the timing belt. Second is the two idler bearing, one being located on the driver side of the engine block and the other on the passenger side of the cylinder head. Third is the timing belt tensioner system, where components work in sync with each other to guide and provide variable tension to the timing belt. This system consists of a tensioner with bracket, and a hydraulic tensioner damper.

Before going through the significant work of taking your car apart for timing belt replacement, please consider the following:

Looking To Save Money... "Can I Just Replace the Timing Belt?" Simply changing the 4.2L Audi S6 timing belt isn't enough. Why? Around the timing belt service interval (75,000 miles), due to age the integrity of the tensioner(s), damper, water pump, and other seals and o-rings are at the end or very near the end of their service life. Some individuals make the mistake of only replacing the timing belt. Then, 10,000-20,000 miles later, their new timing belt fails due to tensioner, idler bearing, or water pump failure.

Tensioners


Why replace your Audi S6 4.2L timing belt tensioners during timing belt service? Just as the timing belt has a designated service life and subsequent change interval, so do the tensioners and idler bearings. It's true that timing belts can get old, begin to crack, and eventually fail. However, it is just as common for the timing belt tensioners and/or idler bearings to fail, thus causing timing belt failure.

How can the tensioners cause a timing belt to fail? Most tensioner bearings contain a set amount of grease behind the seal. This grease provides ample lubrication and ensures tensioner reliability for the designated life span (75,000 miles). During engine operation, constant thermal temperature fluctuations eventually cause the bearing's grease to breakdown and loose it's lubricating properties. Over time, this results in unwanted bearing play and eventual seizure. If a timing belt tensioner has too much play or seizes, the timing belt can become misaligned, or begin to 'burn up' and shred, causing engine failure. Thermal temperatures also affect the timing belt causing the material composition of the belt to change and accelerates it's life span, often resulting in premature failure.

Water Pump


Why replace your V8 Audi S6 water pump during timing belt service? It makes sense from a labor standpoint since timing belt dis-assembly is required for water pump replacement. The water pump is driven by the timing belt and contains an internal sealed bearing that has a life span similar to the timing belt, tensioner, and idler bearings. The internal bearing and seals of an Audi water pump can weaken and is the primary reason why a water pump eventually fails.

Thermostat


Why replace your 4.2L V8 Audi S6 thermostat during timing belt service? The thermostat and housing is located behind the timing belt on the passenger side of the engine. It makes sense from a labor standpoint, since timing belt dis-assembly is required for thermostat replacement. The engine temperature is controlled by the thermostat. Near the end of it's designated service life the thermostat spring temper changes. This causes the thermostat to open too much allowing the engine to run cooler, resulting in poor fuel optimization, decreased fuel economy, and less horsepower.

Cover Gaskets & Cam Chain Tensioner GasketsHardened Audi S6 Valve Cover Gasket

Why replace your Audi S6 valve cover gaskets and cam chain tensioner gaskets during timing belt service? Audi S6 Valve Cover Gasket Replacement KitLeaking S6 cam chain tensioner gaskets are the most common oil leak, producing a foul burning oil smell in your interior. It makes sense from a labor standpoint to replace them during timing belt service, since timing belt dis-assembly is required for proper cam chain tensioner gasket replacement. Replacing them together will save you precious time and hundreds of $$$ of costly labor charges.

For more detailed information regarding V8 Audi S6 Valve Cover Gasket and Cam Chain Tensioner Gaskets, click here.

Audi S6 Timing Belt Replacement Kits

NEW! BLAU OFFICIAL O.E.tm INA Audi S6 Timing Belt Kits for 4.2L 40 Valve Engine

Gen II BLAU® Audi S6 Timing Belt Replacement Kits for the 4.2L 40 valve engine contain a preassembled INA timing belt BASE kit. The timing belt, timing belt tensioner, lever, idler bearing, and tensioner damper contained in these kits are the same as those directly supplied to the O.E. automotive manufacturer (e.g. Audi) and those that were installed on your vehicle on the assembly line.

  • Base INA Audi S6 Timing Belt Kit 4.2L

    INA Base Audi Timing Belt KitBASE

    Preassembled BASE INA Kit:
    • INA Gates Audi S6 Timing Belt
    • NTN Audi S6 Timing Belt
      Tensioner w/ Genuine Hardware
    • NTN Audi S6 Timing Belt
      Hydraulic Damper w/ Genuine
      Hardware
    • INA Audi S6 Timing Belt
      Eccentric Idler w/ Genuine
      Hardware
    • INA Audi S6 Timing Belt
      Tensioner Eccentric Idler
      w/ Genuine Hardware
    • Timing Belt Service Interval
      Sticker

    Buy Audi S6 Timing Belt Kit Base

    Preassembled BASE kit comes directly from our partner Schaeffler who has been manufacturing timing belt components under the Official O.E. INA brand for decades. These kits include the same manufactured brand of timing belt and timing belt tensioner(s), the same ones that were fitted on your car from the factory.
  • Enhanced INA Audi S6 Timing Belt Kit 4.2L

    INA Enhanced Audi Timing Belt KitENHANCED

    Preassembled BASE INA Kit:
    • INA Gates Audi S6 Timing Belt
    • NTN Audi S6 Timing Belt
      Tensioner w/ Genuine Hardware
    • NTN Audi S6 Timing Belt
      Hydraulic Damper w/ Genuine
      Hardware
    • INA Audi S6 Timing Belt
      Eccentric Idler w/ Genuine
      Hardware
    • INA Audi S6 Timing Belt
      Tensioner Eccentric Idler
      w/ Genuine Hardware
    • Timing Belt Service Interval
      Sticker

    Other Components:
    • Graf Water Pump w/ Metal
      Impeller and Gasket
    • Wahler Thermostat Assembly
      w/ Housing & O-Ring
    • Flennor Gates Serpentine Belt
    • Front Crank Seal
    • Camshaft Seals

    also included...

    Blauparts Extras
    • Camshaft Sprocket O-ring
      Seals w/ Circlips
    • Valve Cover Gaskets
    • Front Motor Mount
    • Thread Locking Compounds
    • Anti Seize Compound
    • Blauparts Helpful Audi S6 4.2L
      Timing Belt Guidelines.
    • Front Bumper Removal
      Instructions.

    Buy Audi S6 Timing Belt Kit Enhanced
  • Enhanced Plus INA Audi S6 Timing Belt Kit 4.2L

    INA Enhanced + Audi Timing Belt KitENHANCED +

    Preassembled BASE INA Kit:
    • INA Gates Audi S6 Timing Belt
    • NTN Audi S6 Timing Belt
      Tensioner w/ Genuine Hardware
    • NTN Audi S6 Timing Belt
      Hydraulic Damper w/ Genuine
      Hardware
    • INA Audi S6 Timing Belt
      Eccentric Idler w/ Genuine
      Hardware
    • INA Audi S6 Timing Belt
      Tensioner Eccentric Idler
      w/ Genuine Hardware
    • Timing Belt Service Interval
      Sticker

    Other Components:
    • Graf Water Pump w/ Metal
      Impeller and Gasket
    • Wahler Thermostat Assembly
      w/ Housing & O-Ring
    • Flennor Gates Serpentine Belt
    • Front Crank Seal
    • Camshaft Seals
    6 Liters German Ravenol G12   Plus Antifreeze (4 - 1.5L Bottles)

    also included...

    Blauparts Extras
    • Camshaft Sprocket O-ring
      Seals w/ Circlips
    • Valve Cover Gaskets
    • Front Motor Mount
    • Thread Locking Compounds
    • Anti Seize Compound
    • Blauparts Helpful Audi S6 4.2L
      Timing Belt Guidelines.
    • Front Bumper Removal
      Instructions.

    Buy Audi S6 Timing Belt Kit Enhanced +