OEM GMC Envoy Lash Adjuster

GMC Envoy Lash Adjuster Parts and Q&A

• Valve Lifters
  12698946
  Q: What tools are required to service and repair the valve rocker arm and valve lash adjuster on GMC Envoy?

  A:

  Tools required include: torque angle meter (J 36660-A) and Camshaft sprocket holding tool (J 44222). Start off by unbolting the Camshaft cover, the bolts for exhaust and intake sprockets. Mount the Camshaft sprocket holding tool (J 44222) to the Cylinder Head, aligning the horizontal bolts with the Camshaft sprockets to keep chain tension and avoid interference with the timing chain objects. Very carefully remove the sprockets that are paired with the timing chain from the camshafts and store the Camshaft caps in a rack for proper reinstallation later on. Remove the Camshaft cap bolts after which remove the camshafts caps and then camshafts. Organize the removed Rocker Arms and valve lash adjusters to reinstall in their original position and location. Take off the valve rocker arms and valve lash adjusters. For installation, lubricate and fill the valve lash adjusters with engine oil, and install them back using their original installation locations. Lubricate the valve Rocker Arm roller and place the valve rocker arms back to their original positions, put engine oil on Camshaft journals prior to reinstallation of camshafts. Install the Camshaft caps onto the original journals and tighten the Camshaft caps bolts to 12nm (106 inch lbs). Take detailed steps to reposition Camshaft sprockets onto the camshafts and remove the Camshaft sprocket holding tool (J 44222). The intake Camshaft sprocket washer and bolt, and the exhaust Camshaft actuator bolt need to be installed and tightened, with the intake Camshaft sprocket bolt to 20 nm (15 ft. Lbs.) on the first turn, then with the torque angle meter (J 36660-A) 100 more degrees. Tighten the exhaust Camshaft actuator bolt to 25 nm (18 ft. Lbs. On the first pass then 135 degrees using Torque Angle Meter (J 36660-A). Finally, install the Camshaft cover.
• Valve Lifters
  17122490
  Q: How to replace the valve rocker arm and valve lash adjuster on GMC Envoy?

  A:

  To replace the valve Rocker Arm and valve Lash Adjuster, remove the Camshaft cover and exhaust and the functions inlet sprocket bolts. Mount the Camshaft sprocket holding tool (J44222) onto the Cylinder Head, aligning the horizontal bolts into the Camshaft sprockets to ensure the proper tension of the chain and do not touch the driving chain components. Gently lift the sprockets with the timing chain off the camshafts and then remove the Camshaft cap bolts. Make sure that the Camshaft caps are put in a rack for an easy replacement. Then, remove the Camshaft caps, camshafts, valve rocker arms, and valve lash adjusters without losing track of their position for reassembly. Before installing lubricate and fill the valve lash adjusters with the engine oil. Make sure to lubricate the valve Rocker Arm roller and replace the valve rocker arms into their previous location; apply a coat of engine oil on the Camshaft journals and insert the camshafts. Replace the original Camshaft caps back onto the original journals and tighten the Camshaft cap bolts to 12 nm (106 inch lbs.). Gently reinstall the Camshaft sprockets to the camshafts and take the Camshaft sprocket holding tool (J 44222) off. Mount the intake Camshaft sprocket washer and bolt, then the exhaust Camshaft actuator bolt, and tighten the intake Camshaft sprocket bolt to 20 nm (15 ft. Lbs.), followed by 100 degrees with the torque angle meter (J 36660-A). Torque the exhaust Camshaft actuator bolt, 25 nm (18 ft. Lbs.) on the first pass, then additional 135 degrees on the final pass with the torque angle meter (J 36660-A). Finally, install the Camshaft cover.