Question 1

How to replace the timing chain and sprockets on GMC Canyon?

Accepted Answer

To replace the Timing Chain and sprockets, you should first remove the camshaft cover, then remove camshaft position (CMP) sensor and the engine front cover. Rotate the Crankshaft clockwise until the #1 Piston is at top dead center (TDC) on the compression stroke, ensuring the word delphi on the exhaust camshaft position actuator is parallel with the cylinder head to cam cover mating surface. The camshaft holding tool (J 44221) should be installed to the back of the camshafts, take the tension off of the Timing Chain by moving the tension shoe down and place a tee in the tensioner holding the shoe stationary. Remove and discard the exhaust camshaft position actuator bolt, take away the exhaust camshaft position actuator and the other intake camshaft sprocket bolt and finally the intake camshaft sprocket. Next, extract the Timing Chain, as well as the sprocket from the Crankshaft, then wash and examine the Timing Chain and the sprockets. For installation, ensure the #1 Piston is at tdc, then install the Crankshaft sprocket onto the Crankshaft snout. Mention the dark link of the Timing Chain with the timing of the intake camshaft according to the sprocket, allowing the chain down through the cylinder head to and attach it to the Crankshaft sprocket, align the dark link according to the timing. Mount the intake camshaft sprocket on the intake camshaft and fasten it using new bolt tightened to 20 nm (15 ft. Lbs) and then fasten it additional 100 degrees by using the angle meter (J 450.59). Make sure the camshaft actuator is advanced fully before you put the exhaust camshaft actuator in position, ensuring that you align the dark link with the timing mark of the actuator sprocket. Mount the exhaust cam actuator to the exhaust cam and bolt it with a new bolt that is tightened to 25 nm (18 ft. Lbs.)and then rotate the bolt an additional 135 degrees using the angle meter (J 450.59). Deny the tee from the Timing Chain tensioner in order to have a tension, next remove the camshaft holding tool (J 44221) from the camshafts. Make sure to align the dark links on the Timing Chain to the marks on the sprockets, and finally, attach the engine front cover, the camshaft position (CMP) sensor, and the camshaft cover.

Question 2

How to replace the LH secondary camshaft timing chain on GMC Acadia?

Accepted Answer

Start replacing the left Timing Chain by uninstalling spark plugs first then the engine front cover. Start by removing the right bank Timing Chain and after that remove the primary camshaft drive chain. First remove the left bank Timing Chain Tensioner, shoe, guide, and the camshaft intermediate drive chain idler before proceeding with the left bank Timing Chain itself. All components for camshaft timing drives must receive a clean-up treatment while you will need to replace any units that show signs of wear. Begin installation by placing the left bank Timing Chain first and follow the steps with the camshaft intermediate drive chain idler then Timing Chain guide and shoe then tensioner. The primary camshaft drive chain should be installed before the right bank Timing Chain after engine front cover reattachment and Spark Plug installation.

Question 3

How to replace the timing chain and sprockets on GMC Sierra 1500?

Accepted Answer

In order to lift the Timing Chain and the sprockets, you will need to remove the Oil Pump while rotating the Crankshaft in order to achieve the position where the Crankshaft and the camshaft sprockets have their timing markings aligned while not turning the Crankshaft assembly after the Timing Chain has been removed so as not to damage the piston assemblies or valves. Then remove the bolts of the camshaft sprocket and camshaft sprocket and Timing Chain. Being dependent on the j8433 (Two Jaw Puller), jr41816-2 (Crankshaft End Protector), and j41558 (Crankshaft Sprocket Remover), remove the Crankshaft sprocket before removing the Crankshaft sprocket key if needed. If necessary, clean and check the Timing Chain and sprockets. For the installation, it is necessary to put the key into crank shaft keyway and tap it to situate it until ends do not come out. Lay the Crankshaft sprocket onto the front of the Crankshaft, so that the Crankshaft key aligns with the sprocket keyway, and use the j41665 (Crankshaft Balancer and Sprocket Installer) to fully seat the sprocket against the Crankshaft flange. Rotate the Crankshaft sprocket until the alignment mark is at 12 o'clock position, align the camshaft sprocket locating pin to the camshaft sprocket's hole, the teeth of the sprocket engage with the Timing Chain, the alignment marks on the sprockets align correctly in which camshaft sprocket in 6 o'clock, and Crankshaft in 12 o'clock. Mount the camshaft sprocket and the Timing Chain, making sure to move the camshaft or Crankshaft sprocket to align the timing mark. Lastly, install the camshaft sprocket bolts which can be tightened to 35 nm (26 ft. Lbs.), and reinstall the Oil Pump.

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