OEM GMC Sierra 3500 Camshaft

GMC Sierra 3500 Camshaft Parts and Q&A

• Camshaft
  12561721
  Q: How to replace the camshaft on GMC Sierra 3500?

  A:

  The hood hinge bolt removal starts by raising the hood to its service position then breaking the hood hinge bolts before pulling the hood vertical to tighten the hinge bolts in their service position . Start by taking out the radiator support and front cover as well as the valve lifters and Camshaft sensor bolt and sensor. The Crankshaft requires rotation until the timing marks between Crankshaft and Camshaft sprockets become aligned before removing the Camshaft sprocket bolts. The Crankshaft assembly must not spin after removing the Timing Chain since this leads to piston assembly and valve damage. Users must first extract the Camshaft sprocket and move the Timing Chain into position before detaching both Camshaft retainer bolts and retainer. To safely remove and install the Camshaft protect the Camshaft bearings while placing three m8-1.25 x 100 mm (M8-1.25 x 4.0 inch) bolts into the front bolt holes as a Camshaft extraction tool. You should clean and perform an inspection of both the Camshaft and bearings when needed. The three installation bolts can be reused to guide the engine block installation of the Camshaft before the bolts get removed. Lay the retainer plate with its sealing gasket touching the engine block and keep the gasket surface clean before installing the Camshaft retainer and bolts that need to be tightened to 25 nm (18 ft. Lbs.). Begin by attaching the Camshaft sprocket to the engine then position the Timing Chain followed by Camshaft sprocket bolt tightening to 35 nm (26 ft. Lbs.). You must inspect the Camshaft sensor o-ring seal for signs of damage before proceeding. The Camshaft sensor o-ring seal can be used if intact; apply clean engine oil to it before sensor installation and bolt tightening at 25 nm (18 ft. Lbs.). After installing valve lifters continue installation with front cover and radiator support pieces. Put the hood in its normal position and screw in the hood hinge bolts to a torque of 25 nm (18 ft. Lbs.).