How to Service and Repair the Timing Chain on GMC Canyon?

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To replace the Timing Chain and sprockets, one should start by removing the Camshaft cover followed by the remove the exhaust Camshaft position (CMP) sensor and the intake Camshaft position (CMP) sensor and finally, it is advised to remove 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. Attach the j44221 Camshaft holding tool (J44221) to the rear of camshafts; loosen the tension on the Timing Chain by sliding the tensioner shoe in, and slip a tee in the tensioner to keep the shoe in place. Extract and throw away the exhaust Camshaft position actuator bolt, intake Camshaft sprocket bolt, and intake Camshaft sprocket, then remove the exhaust Camshaft position actuator. Then, take out the Timing Chain and the Crankshaft sprocket, clean and check the Timing Chain and sprocket. For installation, ensure the #1 Piston is at tdc, install the Crankshaft sprocket onto the Crankshaft snout, and align the darkened link of the Timing Chain with the timing mark on the intake Camshaft sprocket. Feed the Timing Chain through the holes in the cylinder head while installing it on the Crankshaft sprocket aligning the dark link to the timing mark. Put the output Camshaft sprocket into position on the output (exhaust) Camshaft, the book shows the sprockets installed upside down compared to everything else in this job. The cam drive through is a series of similar looking links of chain bracketed in, and in the book, there is one you install here later. Replace a new intake cam sprocket bolt tighten to 20 nm (15 ft. Lbs.) and position it with the j 45059 angle meter (J 45059) by 100 degrees. Make sure the Camshaft actuator is fully advanced prior to installing the exhaust Camshaft actuator, aligning dark link of the Timing Chain to timing mark on the exhaust Camshaft position actuator sprocket. Mount the exhaust Camshaft actuator on the exhaust Camshaft, fasten it with a new bolt tightened to 25 nm (18 ft. Lbs.) and using the j 45059 to further turn it 135 degrees. Take off the tee from the Timing Chain Tensioner to restore tension, remove the j 44221 from camshafts, and see if the dark links on the Timing Chain fit the marks on the sprockets. Lastly, replace the engine front cover, intake and exhaust Camshaft position (CMP) sensors and such Camshaft cover.

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