OEM Chevrolet Trailblazer Timing Chain

Chevrolet Trailblazer Timing Chain Parts Questions & Experts Answers

• Timing Chain
  12571725
  Q: How to replace the camshaft timing chain, sprocket, and tensioner on Chevrolet Trailblazer?

  A:

  To replace the camshaft Timing Chain, sprocket, and tensioner, start by removing the camshaft cover and the engine front cover. Remove tension from the Timing Chain by shifting the tensioner shoe toward, and fasten it with a tee. Next, take the exhaust camshaft position actuator bolt and the actuator out, then take out the intake camshaft sprocket bolt, and sprocket, and the s chain and crankshaft sprocket. Remove the cylinder head access hole plugs, tightening the Timing Chain Tensioner shoe bolt and shoe, the tensioner guide bolts, the guide, the tensioner bolts, and the tensioner. For installing, one would have to tighten the Timing Chain Tensioner with a bolt spare count to 25 nm (18 lb ft), tighten the tensioner guide with a bolt spore count of 10 nm (89 lb in) and lastly tighten the tension snow bolt spared count of 26 nm (19 lb ft). Install the cylinder head access hole plugs with a torque of 5 nm (44 lb in). The camshaft holding tool (J 44221) is to be used with the camshaft flats facing up, and the number 1 piston on top dead center, with the crank at 12 o'clock. Nonetheless, install the crankshaft sprocket and the intake camshaft sprocket into the Timing Chain, aligning the dark link of such Timing Chain with the timing mark on the part of the intake camshaft sprocket. Feed the Timing Chain down the opening in the head, put it onto the crankshaft sprocket, and line up the dark link with the timing mark. Rotation and holding the camshaft hex for alignment might require the removal of the camshaft holding tool (J 44221). Mount the intake camshaft with the intake camshaft sprocket, sprocket washer, and bolt. Mount the exhaust camshaft actuator into the Timing Chain, and ensure that the dark link is aligned with the timing mark on the actuator and then mount the actuator onto the exhaust camshaft. You are to apply a pulling force on the exhaust camshaft actuator bolt so as to apply a torque that is stated in the text to a value of 25 nm (18 lb ft) during the first pass and a torque angle from the latter torque angle meter (J 36660-A) during the final pass subject to value that 135 degree. It is important to tighten the intake camshaft sprocket bolt to 20 nm (15 ft. Lb.) on the first pass and then an additional 100 degrees on the final pass using the torque angle meter (J 36660-A). Take off the tee of Timing Chain Tensioner to restore tension, remove the camshaft holding tool (J 44221). Make sure the dark lines on the chain align the marks on the sprockets, and install the engine front cover and the camshaft cover.