BMW VANOS Timing Spline Shaft 11-36-1-738-468

BMW part #11361738468 is a timing spline shaft for BMW M50 / M52 / S50 / S52 and S54 engines. It directly interacts with the VANOS system by maintaining tension on the chain that drives the camshaft sprockets, including the sprocket connected to the VANOS (Variable Nockenwellensteuerung) unit.

The timing spline ensures the timing chain stays taut, allowing the crankshaft to transfer rotational motion reliably to the camshaft sprockets. One of these sprockets is part of the VANOS system, which adjusts the timing of the intake and/or exhaust valves for optimal performance.

The VANOS system requires the camshaft sprocket to rotate with precise timing. If the tensioner fails to keep the chain properly tensioned, it can cause slack or slippage, preventing the VANOS unit from effectively advancing or retarding cam timing. 

When and Why to Replace BMW Part #11-36-1-738-468:

1. Signs of Wear or Failure:

   • Chain Rattle: A worn tensioner can cause a noticeable rattling noise, especially on cold starts.
   • Timing Issues: If the tensioner cannot maintain adequate tension, it may lead to timing chain slack, impacting engine performance or potentially causing misalignment of valve timing.
   • Oil Leaks: The tensioner is often oil-fed. A damaged tensioner can result in oil leaks at its mounting point.

2. Preventive Maintenance:

   • It’s a good idea to replace the tensioner during major engine work, like timing chain replacement, or as part of high-mileage service intervals. BMW recommends inspecting timing components to avoid unexpected failures, particularly in engines subjected to extended wear or high performance use.

3. Performance Applications:

   • In high-performance or forced-induction builds, where additional stress is placed on timing components, customers may choose to replace the tensioner with a new OEM or upgraded version to ensure reliability.

4. Aging Components:

   • Over time, the spring or hydraulic mechanism inside the tensioner can weaken, leading to reduced tensioning ability.

BMW M50 Applications:

3 Series

1990-1995     E36     320i / 325i / 325is
1994-1996     E35/E36     318ti

5 Series

1990-1996     E34     520i / 525i
1991-1996     E34 Touring     520i / 525i

Z Series

1995     E36/E37     Z3 2.0i / 2.5i

BMW M52 Applications:

3 Series

1994-1999     E36     320i / 323i / 323is / 328i / 328is
1997-2000     E35/E36     318ti / 323ti

5 Series

1996-1998     E39     520i / 523i / 528i

7 Series

1996-1998     E38     728i / 728iL

Z Series

1996-1999     E36/E37/E38     Z3 2.0i / 2.2i / 2.8i

BMW S50 US Applications:

3 Series

1994-1995     E36     M3

BMW S52 Applications:

3 Series

1996-1999     E36     M3

Z Series

1998-2000     E36/E37/E38     Z3M

BMW S54 Applications:

BMW 3 Series

2000-2006     E46     M3

BMW Z3 Series

2001-2002     Z3     M

BMW Z4 Series

2006-2008     Z4     M