OEM Lincoln MKS Timing Chain Tensioner

Lincoln MKS Timing Chain Tensioner Parts and Q&A

• Tensioner
  7T4Z-6K254-B
  Q: How to service and repair the timing chain tensioner on Lincoln MKS?

  A:

  The first step requires engine front cover removal while using proper cleanliness techniques to stop any material from entering either oil or coolant passages. A clockwise rotation of crankshaft will position the Variable Camshaft Timing (VCT) components to show their alignment marks. Secure both left-hand and right-hand camshafts at their Top Dead Center position by using the Camshaft Holding Tool. Proceed by removing each of the three bolts from the RH VCT housing followed by the three bolts from the LH VCT housing so you can discard the VCT housing seals. Proceed by taking out first the two bolts from the primary timing chain tensioner and its tensioner arm before extracting the lower LH primary timing chain guide and the primary timing chain and the crankshaft timing chain sprocket. Install a lockpin in the collapsed position on the LH secondary timing chain tensioner after compressing it. The LH VCT assembly bolt and LH exhaust camshaft sprocket bolt should be discarded while you extract the LH VCT assembly along with secondary timing chain and LH exhaust camshaft sprocket as one-piece assembly. You need to use the Camshaft Holding Tool to reach the last secondary timing chain tensioner bolt before removing its two bolts and the LH secondary timing chain tensioner bolts. Installation of a lockpin and compressing allows the removal of an assembly containing the RH VCT assembly, secondary timing chain, and RH exhaust camshaft sprocket after the disposal of both the RH VCT assembly bolt and the RH exhaust camshaft sprocket bolt. The installer needs to remove both bolts from the right-hand secondary timing chain tensioner while also taking out the two bolts from the right-hand primary timing chain guide. When installing begin with the RH primary timing chain guide and fasten its two bolts to 10 Nm (89 lb-in). Insert the RH secondary timing chain tensioner with the Camshaft Holding Tool tilted before torquing its bolts to 10 Nm (89 lb-in). The RH VCT assembly should be assembled together with the RH exhaust camshaft sprocket and RH secondary timing chain while the colored links should match the timing marks before positioning on the camshafts. Use new bolts to secure the VCT assemblies and exhaust camshafts by first applying 40 Nm (30 lb-ft), followed by turning the bolt once before applying 10 Nm (89 lb-in), and finally tightening it by 90 degrees. Install the RH secondary timing chain tensioner by removing its lockpin and tight its bolts to 10 Nm (89 lb-in). Position the LH VCT assembly with its LH exhaust camshaft sprocket and LH secondary timing chain beside the camshafts by fitting the colored links to the timing marks. New bolts for VCT assemblies and exhaust camshafts require tightening at the same four stages as the previous steps. The installation procedure starts with removing the lockpin from the LH secondary timing chain tensioner and then inserting the crankshaft timing chain sprocket and the primary timing chain which must have colored links situated at the proper timing marks on the VCT assemblies and crankshaft sprocket. Fits the LH primary timing chain guides at their specified locations and tightens the bolts to 10 Nm (89 lb-in). The procedure to set the primary timing chain tensioner involves positioning the arm then rotating its lever against the counter-clockwise direction followed by plunger compression through a soft-jawed vise until holes align correctly for lockpin installation. The crankshaft needs a slight rotation first to eliminate slack before the primary tensioner gets installed properly and its bolts get tightened to a value of 10 Nm (89 lb-in) followed by removal of the lockpin. Confirm that all timing marks display proper alignment while installing new VCT housing seals and verifying that VCT housing dowels should be fully inserted into the cylinder head before tightening each bolt to 10 Nm (89 lb-in) according to specified installation order for both LH and RH VCT housings. Install the engine front cover in the last step of the procedure.