OEM Chevrolet Cobalt Timing Chain Tensioner

Chevrolet Cobalt Timing Chain Tensioner Parts Questions & Experts Answers

• Tensioner, Driver Side
  12608580
  Q: How to replace the timing chain tensioner on Chevrolet Cobalt?

  A: To remove the Timing Chain Tensioner, you need to unplug the negative Battery Cable first. Nextinkle the camshaft cover out then the Timing Chain Tensioner out with the seal out of the tensioner. Check for damage on the Timing Chain Tensioner, o-ring seal and washer; replace them as necessary. Measure the Timing Chain Tensioner assembly starting from one end to the other; a new tensioner in the fully compressed non-active form will be 72 mm (2.83 in) or an active state of 85mm (3.35 in) should be supplied. If the Timing Chain Tensioner is not in the compressed state, remove the Piston assembly, from tensioner body, install the j 45027-2 into a vise, insert the notch end of the Piston assembly into j 45027-2 and use j 45027-1 to turn the ratchet cylinder into the Piston. Even the tensioner body bore must be inspected for dirt, debris, and damage; however, polish it with a lint-free cloth if necessary. Return the compressed Piston assembly into the Timing Chain Tensioner body until it drops to the bottom of the bore without being compressed towards the bottom. The tensioner should be about 72 mm (2.83 in). If not, go through the previous steps again. Get rid of every dirt and debris from the area in the cylinder head where the Timing Chain Tensioner is threaded, and ensure that the seal of the timing chain during the process of tightening ensures the seal is centered so as to avoid oil from leaking out. Install the Timing Chain Tensioner assembly and tighten it 75 nm (55 lb ft). Use a suitable tool with a rubber tip to, compress the Timing Chain Tensioner 2mm (0.079 in), pare it to rest over the cam chain, working the tool down from the cam drive chest, then apply a sharp jolt diagonally downwards to release the Timing Chain Tensioner. Finally, replace the camshaft cover and replace the negative Battery Cable as well.