OEM Cadillac STS Timing Chain

Cadillac STS Timing Chain Parts and Q&A

• Timing Chain
  12597307
  Q: How to replace the LH secondary camshaft timing chain on Cadillac STS?

  A:

  To remove the left Timing Chain, start with the removal of the Spark Plug which will allow an easy cranking of the Crankshaft and followed by the engine front cover. Next, proceed to remove the rhs Timing Chain Tensioner, shoe, guide and chain, then remove the primary camshaft drive chain tensioner, upper guide and chain. Proceed by removing the chains on the right side of the bank by removing its camshaft intermediate drive chain idler after which move to the left side to remove its camshaft drive chain tensioner, shoe and guide followed by the left side camshaft intermediate and the drive chain, then for the chains of the Timing Chain then move to the right side to remove its right camshaft intermediate and the drive along with left side camshaft tensioner, chain shoe and guide. Check and inspect all camshaft timing drive components and replace them if needed. Installation begins with the left bank Timing Chain, followed by the left bank camshaft intermediate drive chain idler, guide, shoe, and tensioner. Next, mount the right bank camshaft intermediate drive chain idler, primary camshaft drive chain, primary upper camshaft drive chain guide, and primary camshaft drive chain tensioner. Lastly, put back the right drive chain for the Timing Chain, along with the guide, shoe as well as its tensioner; completely re-install the spark plugs and engine front cover.
• Timing Chain
  12589011
  Q: What Tools Are Required to Set the Camshaft Timing Chain, and What Steps Must Be Followed on Cadillac STS?

  A:

  The tools needed to adjust the Camshaft timing, which has to be done whenever a disturbance to the Camshaft drive system occurs, are as follows: crankshaft socket (J39946). Start with the removal of left Camshaft actuator housing, right Camshaft actuator housing, engine front cover, engine Oil Pump, right secondary Camshaft drive chain, and left secondary Camshaft drive chain. Ensure the main gears and chain are in correct timing before adjusting the left or right secondary Camshaft timing by making use of the Crankshaft socket (J39946) in order to turn the Crankshaft until the timing alignment mark of the primary timing gear is at the top; the Crankshaft keyway is approximately in the 1 o'clock position; and the intermediate sprocket timing mark is at the bottom of its rotation. Timing the primary gears ensures that the #1 cylinder Piston is at top dead center (TDC) for the power stroke event. In case this cannot be done, remove the primary gears and chain in order to realign the timing marks. The left bank 2 secondary Timing Chain has three black links that helps in timing the Camshaft position actuators to the intermediate sprocket with specific black links that align with the bank 2 exhaust actuator timing mark, bank 2 intake actuator timing mark, bank 2 intermediate sprocket. Mount the secondary Timing Chain onto the intermediate sprocket while positioning the sprocket lb timing mark properly to the black link of the Timing Chain. Install the left bank intake and the left bank exhaust Camshaft position actuators, ensuring their timing marks are perpendicular to the surface of the cylinder head deck and to loosely install the oil control valves to be tightened to 120 nm (89 ft. Lbs). Apply the same procedure to the right bank 1 secondary Timing Chain, lining up its black links with the corresponding actuator timing marks and insert the right bank intake and exhaust Camshaft position actuators, likewise making sure their marks are perpendicular, keeping them in with oil control valves tightened at 120 nm (89 ft. Lbs.). Lastly, replace the left and right secondary timing tensioners and the engine Oil Pump, along with Camshaft actuator housings.